LG 86QNED81

Все сервис мануалы для телевизоров LG: http://webos-forums.ru/topic3291.html LED TV SERVICE MANUAL CHASSIS : UB32A MODEL : 86QNED81SRA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL71988261 (2302-REV00) Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual. Copyright © 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.

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CONTENTS CONTENTS ............................................................................................... 2 SAFETY PRECAUTIONS ......................................................................... 3 SERVICING PRECAUTIONS .................................................................... 4 SPECIFICATION ........................................................................................ 6 SOFTWARE UPDATE .............................................................................. 9 BLOCK DIAGRAM .................................................................................. 11 EXPLODED VIEW ................................................................................... 12 WIRING DIAGRAM ................................................................................. 13 ASSEMBLY / DISASSEMBLY GUIDE .................................................... 14 TROUBLE SHOOTING GUIDE ................................................. APPENDIX -2- Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Exploded View. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. General Guidance Leakage Current Hot Check (See below Figure) Plug the AC cord directly into the AC outlet. An isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC Do not use a line Isolation Transformer during this check. power line. Use a transformer of adequate power rating as this Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor protects the technician from accidents resulting in personal injury between a known good earth ground (Water Pipe, Conduit, etc.) from electrical shocks. and the exposed metallic parts. Measure the AC voltage across the resistor using AC voltmeter It will also protect the receiver and it's components from being with 1000 ohms/volt or more sensitivity. damaged by accidental shorts of the circuitry that may be Reverse plug the AC cord into the AC outlet and repeat AC voltage inadvertently introduced during the service operation. measurements for each exposed metallic part. Any voltage measured must not exceed 0.75 volt RMS which is corresponds to If any fuse (or Fusible Resistor) in this TV receiver is blown, 0.5 mA. replace it with the specified. In case any measurement is out of the limits specified, there is possibility of shock hazard and the set must be checked and When replacing a high wattage resistor (Oxide Metal Film Resistor, repaired before it is returned to the customer. over 1 W), keep the resistor 10 mm away from PCB. Leakage Current Hot Check circuit Keep wires away from high voltage or high temperature parts. Before returning the receiver to the customer, always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, etc., to be sure the set is safe to operate without damage of electrical shock. Leakage Current Cold Check(Antenna Cold Check) With the instrument AC plug removed from AC source, connect an electrical jumper across the two AC plug prongs. Place the AC switch in the on position, connect one lead of ohm-meter to the AC plug prongs tied together and touch other ohm-meter lead in turn to each exposed metallic parts such as antenna terminals, phone jacks, etc. If the exposed metallic part has a return path to the chassis, the measured resistance should be between 1 MΩ and 5.2 MΩ. When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer. -3- Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service 2. After removing an electrical assembly equipped with ES manual and its supplements and addenda, read and follow the devices, place the assembly on a conductive surface such as SAFETY PRECAUTIONS on page 3 of this publication. aluminum foil, to prevent electrostatic charge buildup or expo- NOTE: If unforeseen circumstances create conflict between the sure of the assembly. following servicing precautions and any of the safety precautions 3. Use only a grounded-tip soldering iron to solder or unsolder ES on page 3 of this publication, always follow the safety precautions. devices. Remember: Safety First. 4. Use only an anti-static type solder removal device. Some solder removal devices not classified as “anti-static” can generate General Servicing Precautions electrical charges sufficient to damage ES devices. 1. Always unplug the receiver AC power cord from the AC power 5. Do not use freon-propelled chemicals. These can generate source before; electrical charges sufficient to damage ES devices. a. Removing or reinstalling any component, circuit board mod- 6. Do not remove a replacement ES device from its protective ule or any other receiver assembly. package until immediately before you are ready to install it. b. Disconnecting or reconnecting any receiver electrical plug or (Most replacement ES devices are packaged with leads electri- other electrical connection. cally shorted together by conductive foam, aluminum foil or c. Connecting a test substitute in parallel with an electrolytic comparable conductive material). capacitor in the receiver. 7. Immediately before removing the protective material from the CAUTION: A wrong part substitution or incorrect polarity leads of a replacement ES device, touch the protective material installation of electrolytic capacitors may result in an explo- to the chassis or circuit assembly into which the device will be sion hazard. installed. 2. Test high voltage only by measuring it with an appropriate CAUTION: Be sure no power is applied to the chassis or circuit, high voltage meter or other voltage measuring device (DVM, and observe all other safety precautions. FETVOM, etc) equipped with a suitable high voltage probe. 8. Minimize bodily motions when handling unpackaged replace- Do not test high voltage by "drawing an arc". ment ES devices. (Otherwise harmless motion such as the 3. Do not spray chemicals on or near this receiver or any of its brushing together of your clothes fabric or the lifting of your assemblies. foot from a carpeted floor can generate static electricity suf- 4. Unless specified otherwise in this service manual, clean ficient to damage an ES device.) electrical contacts only by applying the following mixture to the contacts with a pipe cleaner, cotton-tipped stick or comparable General Soldering Guidelines non-abrasive applicator; 10 % (by volume) Acetone and 90 % 1. Use a grounded-tip, low-wattage soldering iron and appropriate (by volume) isopropyl alcohol (90 % - 99 % strength) tip size and shape that will maintain tip temperature within the CAUTION: This is a flammable mixture. range or 500 °F to 600 °F. Unless specified otherwise in this service manual, lubrication of 2. Use an appropriate gauge of RMA resin-core solder composed contacts in not required. of 60 parts tin/40 parts lead. 5. Do not defeat any plug/socket B+ voltage interlocks with which 3. Keep the soldering iron tip clean and well tinned. receivers covered by this service manual might be equipped. 4. Thoroughly clean the surfaces to be soldered. Use a mall wire- 6. Do not apply AC power to this instrument and/or any of its bristle (0.5 inch, or 1.25 cm) brush with a metal handle. electrical assemblies unless all solid-state device heat sinks are Do not use freon-propelled spray-on cleaners. correctly installed. 5. Use the following unsoldering technique 7. Always connect the test receiver ground lead to the receiver a. Allow the soldering iron tip to reach normal temperature. chassis ground before connecting the test receiver positive (500 °F to 600 °F) lead. b. Heat the component lead until the solder melts. Always remove the test receiver ground lead last. c. Quickly draw the melted solder with an anti-static, suction- 8. Use with this receiver only the test fixtures specified in this type solder removal device or with solder braid. service manual. CAUTION: Work quickly to avoid overheating the circuit CAUTION: Do not connect the test fixture ground strap to any board printed foil. heat sink in this receiver. 6. Use the following soldering technique. a. Allow the soldering iron tip to reach a normal temperature Electrostatically Sensitive (ES) Devices (500 °F to 600 °F) Some semiconductor (solid-state) devices can be damaged eas- b. First, hold the soldering iron tip and solder the strand against ily by static electricity. Such components commonly are called the component lead until the solder melts. Electrostatically Sensitive (ES) Devices. Examples of typical ES c. Quickly move the soldering iron tip to the junction of the devices are integrated circuits and some field-effect transistors component lead and the printed circuit foil, and hold it there and semiconductor “chip” components. The following techniques only until the solder flows onto and around both the compo- should be used to help reduce the incidence of component dam- nent lead and the foil. age caused by static by static electricity. CAUTION: Work quickly to avoid overheating the circuit 1. Immediately before handling any semiconductor component or board printed foil. semiconductor-equipped assembly, drain off any electrostatic d. Closely inspect the solder area and remove any excess or charge on your body by touching a known earth ground. Alter- splashed solder with a small wire-bristle brush. natively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent poten- tial shock reasons prior to applying power to the unit under test. -4- Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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IC Remove/Replacement 3. Solder the connections. Some chassis circuit boards have slotted holes (oblong) through CAUTION: Maintain original spacing between the replaced which the IC leads are inserted and then bent flat against the cir- component and adjacent components and the circuit board to cuit foil. When holes are the slotted type, the following technique prevent excessive component temperatures. should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique Circuit Board Foil Repair as outlined in paragraphs 5 and 6 above. Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit Removal board causing the foil to separate from or "lift-off" the board. The 1. Desolder and straighten each IC lead in one operation by following guidelines and procedures should be followed whenever gently prying up on the lead with the soldering iron tip as the this condition is encountered. solder melts. 2. Draw away the melted solder with an anti-static suction-type At IC Connections solder removal device (or with solder braid) before removing To repair a defective copper pattern at IC connections use the the IC. following procedure to install a jumper wire on the copper pattern Replacement side of the circuit board. (Use this technique only on IC connec- 1. Carefully insert the replacement IC in the circuit board. tions). 2. Carefully bend each IC lead against the circuit foil pad and solder it. 1. Carefully remove the damaged copper pattern with a sharp 3. Clean the soldered areas with a small wire-bristle brush. knife. (Remove only as much copper as absolutely necessary). (It is not necessary to reapply acrylic coating to the areas). 2. carefully scratch away the solder resist and acrylic coating (if used) from the end of the remaining copper pattern. "Small-Signal" Discrete Transistor 3. Bend a small "U" in one end of a small gauge jumper wire and Removal/Replacement carefully crimp it around the IC pin. Solder the IC connection. 1. Remove the defective transistor by clipping its leads as close 4. Route the jumper wire along the path of the out-away copper as possible to the component body. pattern and let it overlap the previously scraped end of the 2. Bend into a "U" shape the end of each of three leads remaining good copper pattern. Solder the overlapped area and clip off on the circuit board. any excess jumper wire. 3. Bend into a "U" shape the replacement transistor leads. 4. Connect the replacement transistor leads to the corresponding At Other Connections leads extending from the circuit board and crimp the "U" with Use the following technique to repair the defective copper pattern long nose pliers to insure metal to metal contact then solder at connections other than IC Pins. This technique involves the each connection. installation of a jumper wire on the component side of the circuit board. Power Output, Transistor Device Removal/Replacement 1. Remove the defective copper pattern with a sharp knife. 1. Heat and remove all solder from around the transistor leads. Remove at least 1/4 inch of copper, to ensure that a hazardous 2. Remove the heat sink mounting screw (if so equipped). condition will not exist if the jumper wire opens. 3. Carefully remove the transistor from the heat sink of the circuit 2. Trace along the copper pattern from both sides of the pattern board. break and locate the nearest component that is directly con- 4. Insert new transistor in the circuit board. nected to the affected copper pattern. 5. Solder each transistor lead, and clip off excess lead. 3. Connect insulated 20-gauge jumper wire from the lead of the 6. Replace heat sink. nearest component on one side of the pattern break to the lead of the nearest component on the other side. Diode Removal/Replacement Carefully crimp and solder the connections. 1. Remove defective diode by clipping its leads as close as pos- CAUTION: Be sure the insulated jumper wire is dressed so the sible to diode body. it does not touch components or sharp edges. 2. Bend the two remaining leads perpendicular y to the circuit board. 3. Observing diode polarity, wrap each lead of the new diode around the corresponding lead on the circuit board. 4. Securely crimp each connection and solder it. 5. Inspect (on the circuit board copper side) the solder joints of the two "original" leads. If they are not shiny, reheat them and if necessary, apply additional solder. Fuse and Conventional Resistor Removal/Replacement 1. Clip each fuse or resistor lead at top of the circuit board hollow stake. 2. Securely crimp the leads of replacement component around notch at stake top. -5- Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range 3. Test method This specification is applied to the LED TV used UB32B (1) Performance: LGE TV test method followed chassis. (2) Demanded other specification - Safety : CE, IEC specification - EMC : CE, IEC specification 2. Requirement for Test Each part is tested as below without special notice (1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 2 °C (2) Relative Humidity: 60 % ± 10 % (3) Power Voltage : Standard input voltage (AC 100-240 V~, 50/60 Hz) * Standard Voltage of each products is marked by models. (4) Specification and performance of each parts are followed each drawing and specification by part number in accordance with BOM. (5) The receiver must be operated for about 20 minutes prior to the adjustment. 4. Model General Specification No. Item Specification Remarks 1 Market Oceania / Asia (1) Digital TV : DVB-T/T2, DVB-C 2 Television system (2) Analogue TV : P AL B/B, PAL B/G, PAL D/K, PAL-I, SECAM B/G, SECAM D/K, NTSC-M 3 Program coverage (1) ATV & DVB-T/T2 : 3,000EA ► DVB-T - Guard Interval(Bitrate_Mbit/s): 1/4, 1/8, 1/16, 1/32 - Modulation : Code Rate QPSK : 1/2, 2/3, 3/4, 5/6, 7/8 16-QAM : 1/2, 2/3, 3/4, 5/6, 7/8 64-QAM : 1/2, 2/3, 3/4, 5/6, 7/8 ► DVB-T2 - Guard Interval(Bitrate_Mbit/s) Analogue : Upper Heterodyne 1/4, 1/8, 1/16, 1/32, 1/128, 19/128, 19/256, 4 Receiving system Digital : COFDM, QAM - Modulation : Code Rate QPSK : 1/2, 2/5, 2/3, 3/4, 5/6 16-QAM : 1/2, 2/5, 2/3, 3/4, 5/6 64-QAM : 1/2, 2/5, 2/3, 3/4, 5/6 256-QAM : 1/2, 2/5, 2/3, 3/4, 5/6 ► DVB-C - Symbolrate : 4.0Msymbols/s to 7.2Msymbols/s - Modulation : 16QAM, 64-QAM, 128-QAM and 256- QAM HDMI 1 HDMI HDMI 2 Support ARC (Depanding on model) 5 PC / DTV Format Input HDMI 3 Support ARC (Depanding on model). HDMI 4 * Some models do not support HDMI4 6 USB Input My Media(Movie/Photo/Music List) or SVC 7 SPDIF out Optical Audio out 8 Ethernet Connect 9 AV Input CVBS, Audio L/R Only for INDIA -6- Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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5. External Input Format 5.1. HDMI (1) DTV mode No. Resolution H-freq(kHz) V-freq(kHz) Pixel clock(MHz) Proposed Remarks 1 640*480 31.46 59.94 25.12 SDTV 480P 2 640*480 31.5 60 25.12 SDTV 480P 3 720*480 31.47 59.94 27 SDTV 480P 4 720*480 31.5 60 27.02 SDTV 480P 5 720*576 31.25 50 27 SDTV 576P 6 1280*720 44.96 59.94 74.17 HDTV 720P 7 1280*720 45 60 74.25 HDTV 720P 8 1280*720 37.5 50 74.25 HDTV 720P 9 1920*1080 28.12 50 74.25 HDTV 1080I 10 1920*1080 33.72 59.94 74.17 HDTV 1080I 11 1920*1080 33.75 60 74.25 HDTV 1080I 12 1920*1080 26.97 23.97 63.29 HDTV 1080P 13 1920*1080 27 24 63.36 HDTV 1080P 14 1920*1080 33.71 29.97 79.12 HDTV 1080P 15 1920*1080 33.75 30 79.2 HDTV 1080P 16 1920*1080 56.25 50 148.5 HDTV 1080P 17 1920*1080 67.43 59.94 148.35 HDTV 1080P 18 1920*1080 67.5 60 148.5 HDTV 1080P 19 1920*1080 112.5 100 297 UDTV 2160P 20 1920*1080 134.86 119.88 296.7 UDTV 2160P 21 1920*1080 135 120 297 UDTV 2160P 22 3840*2160 53.95 23.98 296.7 UDTV 2160P 23 3840*2160 54 24 297 UDTV 2160P 24 3840*2160 56.25 25 297 UDTV 2160P Not Support for FHD. 25 3840*2160 61.43 29.97 296.7 UDTV 2160P 26 3840*2160 67.5 30 297 UDTV 2160P 27 3840*2160 112.5 50 594 UDTV 2160P 28 3840*2160 134.86 59.94 593.4 UDTV 2160P 29 3840*2160 135 60 594 UDTV 2160P 30 3840*2160 225 100 1188 UDTV 2160P 4K120 model (K6Hp HDMI 31 3840*2160 269.73 119.88 1186.8 UDTV 2160P 3,4 port, O20) or 8K model 32 3840*2160 270 120 1188 UDTV 2160P 33 4096*2160 53.95 23.98 296.7 UDTV 2160P 34 4096*2160 54 24 297 UDTV 2160P 35 4096*2160 56.25 25 297 UDTV 2160P 36 4096*2160 61.43 29.97 296.7 UDTV 2160P Not Support for FHD. 37 4096*2160 67.5 30 297 UDTV 2160P 38 4096*2160 112.5 50 594 UDTV 2160P 39 4096*2160 134.86 59.94 593.4 UDTV 2160P 40 4096*2160 135 60 594 UDTV 2160P 41 4096*2160 225 100 1188 UDTV 2160P 4K120 model (K6Hp HDMI 42 4096*2160 269.73 119.88 1186.8 UDTV 2160P 3,4 port, O20) or 8K model 43 4096*2160 270 120 1188 UDTV 2160P 44 7680*4320 107.89 23.98 1188 8K 45 7680*4320 108 24 1188 8K 46 7680*4320 110 25 1188 8K 47 7680*4320 131.87 29.97 1188 8K 8K Model Only. 48 7680*4320 132 30 1188 8K 49 7680*4320 220 50 2376 8K 50 7680*4320 263.74 59.94 2376 8K 51 7680*4320 264 60 2376 8K -7- Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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(2) PC mode No. Resolution H-freq(kHz) V-freq(kHz) Pixel clock(MHz) Proposed Remarks 1 640*350 31.46 70.09 25.17 EGA 2 720*400 31.46 70.08 28.32 DOS 3 640*480 31.46 59.94 25.17 VESA(VGA) 4 800*600 37.87 60.31 40 VESA(SVGA) 5 1024*768 48.36 60 65 VESA(XGA) 6 1360*768 47.71 60.01 84.75 VESA(WXGA) 7 1152*864 54.34 60.05 80 VESA Support to HDMI-PC, Not Sup- 8 1280*1024 63.98 60.02 109 SXGA port for FHD. WUXGA(Reduced 9 1920*1080 67.5 60 158.4 Blanking) 10 1920*1080 134.86 119.88 296.7 UDTV 2160P 11 1920*1080 135 120 297 UDTV 2160P 12 3840*2160 53.95 23.98 296.7 UDTV 2160P 13 3840*2160 54 24 297 UDTV 2160P 14 3840*2160 56.25 25 297 UDTV 2160P 15 3840*2160 61.43 29.97 296.7 UDTV 2160P 16 3840*2160 67.5 30 297 UDTV 2160P 17 3840*2160 112.5 50 594 UDTV 2160P 18 3840*2160 134.86 59.94 593.4 UDTV 2160P Not Support for FHD. 19 3840*2160 135 60 594 UDTV 2160P 20 4096*2160 53.95 23.98 296.7 UDTV 2160P 21 4096*2160 54 24 297 UDTV 2160P 22 4096*2160 56.25 25 297 UDTV 2160P 23 4096*2160 61.43 29.97 296.7 UDTV 2160P 24 4096*2160 67.5 30 297 UDTV 2160P 25 4096*2160 112.5 50 594 UDTV 2160P 26 4096*2160 134.86 59.94 593.4 UDTV 2160P 27 4096*2160 135 60 594 UDTV 2160P (UHD 60Hz models only), Sup- 28 2560*1440 88.78 59.95 241.5 3K port only when UHD DeepColor is On (UHD, 8K 120Hz models only), 29 2560*1440 182.99 119.99 497.7 3K Support only when UHD Deep- Color is On -8- Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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SOFTWARE UPDATE 1. USB DOWNLOAD 2. NSU DOWNLOAD (1) Plug in the USB to the TV (This Function is needed to connect to the internet.) (2) If there are update-able files in the USB, the TV would ask that the user want to process the SW upper version update. Case 1) Auto Update On (1) G o to Menu → All Settings → Support → Software Update, then check Auto update is turned on. (3) Click “Yes” button : Start Update (2) After the update complete, the user can check a pop-up below the picture, which indicated update is complete and the new version will be applied after the TV turn off and on. (4) Click “Check Now” : Go to SW Update menu for monitoring (5) TV has been starting SW update (3) If the user want to check the process of updating [Menu → All Settings → Support → Software Update] (6) After finishing the update, it will show a pop-up below the picture. . (7) Click “Yes” : Tv will be turn off and on itself -9- Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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(4) If it needs to cancel the update, click “cancel update” button (4) If the user started the update, the TV shows a pop-up below the picture. (5) [“No”] : update continue [“Yes”] : update cancel (5) [CHECK NOW] : Just start the update [Close] : Close the pop-up Case 2) N  OT Allow Automatic Updates Toggle Item (1) Go to Menu → All Settings → Support → Software Update (2) If it found upper version SW than the TV SW version, TV would show a pop-up like below the picture. “The latest version of the SW is available for your TV. Do you want to update now” (3) [Yes] : update starts. [No] : Close the pop-up, check out later - 10 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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9 9 9 9 9 3.3V 9 1.1V 9 1.8V 9 5V Normal DDR DDR Normal X_TAL 27MHz 9 9 9 9 9 9B67 9B67 9 9 9 3.5V 9 0.9V 9 1.0V MICOM P_TS_IN ST_BY Core CPU P_TS_OUT CI Slot 9 9B67 CEDS/EPI 68p, Vx1 41p I2C_4 NVRAM (256Kb) Vx1 / CEDS / EPI eMMC 9 7R eMMC (16GB) CLK/DATA/STRB 9 3DQHO CEDS/EPI 68p, Vx1 51p 9 Vx1 / CEDS / EPI USB1 (2.0) OCP 9 USB2 (2.0) 9 Main SoC From - 11 - 9 I2S Out HDMI1 Power MAIN Audio AMP HDMI2(ARC) I2C 0 B/D HDMI3 HDMI4 IR/Key IF IQ (+/-), IP(+/-) IF (+/-) IF_S 9 TS Copyright © BLOCK DIAGRAM TUNER SPDIF OUT ETHERNET TUNER USB_WIFI I2C3 CVBS/YPbPr 6LJQDO)ORZ Sub Assy (S,S2) (T2/C/A) 6XSSO\3RZHU 9B67 ,QRXW3RZHU 9 LNB AMP T2/C/S/S2 H-NIM tuner Air/ MAX323 DVB-S 9B67 Cable IR / KEY LAN AV H/P SPDIF 7R:,),%7 RS-232 Only for training and service purposes. &RPER Area Option LG Electronics Inc. All rights reserved.

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EXPLODED VIEW IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the EXPLODED VIEW. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. 920 AW3 A10 AW1 910 952 AE2 Depending on model 900 AE1 951 710 700 AH1 Cable Holder 400 AW2 AB1 ARC2 810 411 120 522 521 AR2 540 570 500 200D 200T 200 121 530 200A 820 - 12 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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WIRING DIAGRAM HD1 Driver Board HT1 HP1 Power Board Main Board LV2 LV1 HW1 HS1 SPEAKER WIFI SPEAKER IR LV2 LV1 HP1 HT1 HS1 HW1 HD1 - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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ASSEMBLY / DISASSEMBLY GUIDE (SET) 1. Back Cover Handling guide ▪ Top defect caused by imbalance ▪ Upper and lower handling guide – NG (In case of imbalance) ▪ Handling guide when moving the product - OK - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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2. Back Cover Disassembly Guide (1) Lay the TV Set on a flat pad. (Disassemble Stand Assy) (2) Disassemble B/C Screw. Screw : 23EA - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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(3) Remove the bracket by pressing the side of the power cord bracket, pulling the power cord line upwards, and then pressing the side of the code to remove the power cord. (4) Preparing B/C remove after Checking the Module Latch Position. Latch : 2EA (5) Remove the Latch 2EA and Back Cover by holding the center of the lower back cover and pushing it upwards as shown in the picture. Latch 1EA careful Latch 1EA careful - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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■ ‘Cover, Rear Bottom’ Latch disassembly. [Disassembly the 3 latches of Cover, Rear Bottom] Center latch 1EA Latch shape Left/Right latch 2EA ‘B-1’ ‘A’ ‘B-2’ ‘A’ 1. P  ush ‘Case Top Bottom’ upward with left thumb. 2. P  ull ‘Cover, Rear Bottom’ downward 2 with rest left fingers. 3. W  hile applying force ‘1’ and ‘2’ areas, lift the ‘3’ IR Bracket upward and disas- 1 semble 1 center latch. 3 ‘B-1’ ‘B-2’ 1. Hold the left/right ends of the ‘Cover, Rear Bottom’ as shown in the picture. 2. Disassemble each latch on the left and right by twisting the bottom of the product. - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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3. Back Cover Assemble Guide (1) Place the B/C on top of the module and assemble the Latch position by hand. → When assembling a latch, it makes clicking sound and if the latch is not assembled, it is easily recognized by the back cover is opened. Latch : 2EA (2) Connect the power cord and combine the power cord bracket from the left. (3) Assemble B/C Screw. Screw : 23EA - 18 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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ASSEMBLY / DISASSEMBLY GUIDE (MODULE) ■ LED Array Disassembly Guide (1) Open connector and pull FFC out from connector. 1. Disassembly of Cover Shield L, R (2) Pull S-PCB out from holder. (1) Remove tape. * Take the tape off slowly. The tape is attached to the FFC, so removing the tape quickly will damage the FFC. 3. Disassembly of Guide panel (2) Disassemble screw. (Left 5 EA, Right 6 EA) (1) Disassemble guide panel. (Up: 10 EA / Left: 5 EA / Right: 5 EA) 2. Disassemble T-CON FFC and S-PCB. T-CON FFC - 19 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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4. Disassembly of Case Top (1) Disassemble down side case top screws. (8EA) 5. Reverse the module. (1) Two people should hold the left/right side each and reverse it. (2) Fix the S-PCB to Panel (use the tape). * Do not push the panel so tight with finger or hands. 6. Disassembly of guide panel hooks (Down, 8 EA) (1) Disassemble hooks with flat stick. - 20 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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7. Disassemble Guide panel hooks. (UP: 6 EA, Left: 3 EA, Right: 3 EA) *Dimensions in approximate position 190mm 480mm 715mm 715mm 480mm 190mm 130mm 130mm 550mm 550mm 970mm 970mm 8. Panel and Guide Panel disassembly (Recommended use of 12-gauge suction) * 12-gauge suction (Recommendations) 9. Removal of Sheets and DP Sheet * Sheet 1ea, DP 1ea 10. Removal of DPS(43 EA) - 21 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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11. Removal of Reflector(L/R) *Be careful not to damage the reflector sheet 12. Removal of LED Array * Press the CNT of extension B/D and then remove the LED array at an angle - 22 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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■ LED Array Assembly Guide 3. Assemble the DPS.(43 EA) 1. Assemble the LED Array. (1) Hold the front of LED array and assemble the LED array. (2) Assemble according to the direction(like picture). (3) Press LED Array to cover bottom. 4. Assemble the DP and sheet. 2. Assemble the Reflector.(L/R) (1) Make sure it is assembled on the sheet hangers. (2) There is chamfer in lower left corner of the DP and sheet. D/P (1) Assemble according to Guide embo. (4 EA) LEFT UP (2) Assemble the reflector sheet bellow the lens with your fingers. (3) In the case of corner and center, place the side marked UP DOWN on top. * Chamfer Optical LEFT Sheet Embo DOWN * Chamfer - 23 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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5. Assemble the Panel and Guide Panel. 7. T  ighten the screws from back side(5 (Recommended use of 12-gauge suction) points) and bottom side of guide panel. (1) Assemble the upper left/right first and assemble the bottom left/right. * 12-gauge suction (Recommendations) 6. Assemble the Guide Panel hook. (Up 6 EA, Left 3 EA, Right 3 EA, Down 8 EA) (1) Assemble according to Guide embo. (4 EA) (2) Assemble the reflector sheet bellow the lens with your fingers. (3) In the case of corner and center, place the side marked UP on top. 190mm 480mm 715mm 715mm 480mm 190mm 130mm 130mm *Dimensions in approximate position 550mm 550mm 970mm 970mm Up, Left, Right Down - 24 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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8. Assemble the case top screws (1) First, align with guide embo. (O) (2) Then, assemble bottom Side Screws 8 EA. (3) When the left and right ends, hold case top by hand. 9. Reverse the module and assemble guide panel screw (1) Two people should hold the left/right side each and reverse it. * Do not push the panel so tight with finger or hands. (2) Assemble guide panel. (Up : 10 EA / Left : 5 EA / Right : 5 EA) 10. Assemble T-CON FFC and S-PCB T-CON FFC - 25 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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11. Assemble the cover shield (L, R) (1) Assemble the cover shield with screw. (Left 5ea, Right 6ea) (2) Attach tapes on the bridge FFC. - 26 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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TROUBLE SHOOTING GUIDE Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Contents of Standard Repair Process No. Error symptom (High category) Error symptom (Mid category) Page Remarks 1 No video/Normal audio 1 2 No video/No audio 2 3 Picture broken/ Freezing 3 A. Video error 4 Color error 4 Vertical/Horizontal bar, residual image, light spot, 5 5 external device color error 6 No power 6 7 B. Power error Off when on, off while viewing, power auto on/off 7 8 Off when on, off while viewing, power auto on/off 8 9 No audio/Normal video 9 C. Audio error 10 Wrecked audio/discontinuation/noise 10 11 Remote control & Local switch checking 11 12 Magic Remote control operating checking 12 13 D. Function error WiFi operating checking 13 14 External device recognition error 14 15 Voice Recognition Function Error 15 16 E. Noise Circuit noise, mechanical noise 16 17 F. Exterior error Exterior defect 17 First of all, Check whether there is SVC Bulletin in GSCS System for these model. Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error A. Video error date symptom No video/ Normal audio Revised date 1/17 First of all, Check whether all of cables between board is inserted properly or not. (Main B/D↔ Power B/D, Each Cable for Panel, Speaker Cable, IR B/D Cable,,,) ☞A1 ☞A9 No video Normal Y Check Back Light Y Check Power board Y Replace T-con/Main Normal On Normal audio audio On with naked eye 12V etc. voltage Board or module N N N Move to No ☞A9 Check Power Board VLED output Repair Power video/No audio Board or parts Y LED Y Normal Error Check LED Driver Replace LED Driver B’D voltage Board by LED indicator Driver BD error N N Repair Power Replace Module End End Board or parts ※Precaution ☞A4 & A2 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error A. Video error date symptom No video/ No audio Revised date 2/17 ☞A9 Check various Y Check and No Video/ Normal voltages of Power replace No audio voltage? Board (12V…) MAIN B/D N End Replace Power Board and repair parts Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error A. Video error date symptom Picture broken/ Freezing Revised date 3/17 . By using Digital signal level meter ☞ A3 . By using Diagnostics menu on OSD Check RF Signal level ( Advanced→ Channels→ Channel Tuning→ Manual Tuning → Check the Signal ) - Signal strength (Normal : over 50%) - Signal Quality (Normal: over 50%) Check whether other equipments have problem or not. Normal Y (By connecting RF Cable at other equipment) Signal? → DVD Player ,Set-Top-Box, Different maker TV etc` N ☞ A4 Check RF Cable Normal Y Check SVC N Check Tuner Y Connection Close 1. Reconnection Picture? S/W Version Bulletin? soldering 2. Install Booster Y N N S/W Upgrade Normal N Contact with signal distributor Picture? or broadcaster (Cable or Air) Normal N Y Picture? Replace Main B/D Y Close Close Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error A. Video error date symptom Color error Revised date 4/17 ☞ A7 ☞A6 ※ Check and replace Link Check color by input Y Cable Y Y Color Color Color -External Input (EPI or Vx1 Replace Main B/D Replace module error? error? error? -HDMI Cable) and N contact N N condition End Check error color input mode ☞A20 External Input/ Check external External Y Check Test pattern Component device and device/Cable Replace Main/T-con B/D error cable normal N Request repair for external device/cable N Check external External Y HDMI device and device/Cable Replace Main/T-con B/D error cable normal Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error A. Video error date symptom Vertical / Horizontal bar, residual image, light spot, external device color error Revised date 5/17 Vertical/Horizontal bar, residual image, light spot Replace Module ☞A6 ☞ A7 N Check color condition Check external Check and by input Screen Y Y Screen N Screen device connection Normal? replace Link Replace Main/T-con B/D -External Input normal? normal? normal? condition Cable -HDMI For LGD panel Y Y N N Replace Main B/D ☞A20 Replace Request repair End End module for external For other panel Check Test pattern device External device screen error-Color error Check screen Check S/W Version N condition by input External Connect other external Check -External Input Input device and cable version -Component error (Check normal operation of N Replace -HDMI/DVI Screen External Input, Component, Main/T-con Y normal? RGB and HDMI/DVI by B/D Component connecting Jig, pattern error Y S/W Upgrade Generator ,Set-top Box etc. Request repair for external device Connect other external Y Normal N device and cable screen? Replace HDMI/ (Check normal operation of Screen N External Input, Component, Main /T-con Y DVI normal? RGB and HDMI/DVI by B/D connecting Jig, pattern Generator ,Set-top Box etc. End Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error B. Power error date symptom No power Revised date 6/17 ☞A8 ☞A9 Y DC Power on N Y Check front Power Normal Check Power Replace by pressing Power Key OK? Power Indicator LED On? operation? On ‘”High” Power B/D On Remote control . Stand-By: Red or Turn On N Y N . Operating: Turn Off Check Power cord Replace Main B/D was inserted properly ☞A9 Measure voltage of each output of Power B/D N Normal? Y Y Normal Y Replace Main B/D voltage? Normal Close Check Power ST-BY 7.8V Y voltage? N ☞A9 Replace Power B/D N Replace Power B/D Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error B. Power error date symptom Off when on, off while viewing, power auto on/off Revised date 7/17 Check Power outlet ☞A11 N Check Power Off CPU Y Check A/C cord Error? Replace Main B/D Normal? End Mode Abnormal N Check for all 2- phase Y NO_ Replace Power B/D power out POLLING Fix A/C cord & Power Outlet and check ☞A9 each 2 phase out (If Power Off mode is not displayed) Normal Y Replace Main B/D Check Power B/D voltage? voltage N ※ Caution Check and fix exterior Replace Power B/D of Power B/D Part Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error B. Power error date symptom Off when on, off while viewing, power auto on/off Revised date 8/17 * Please refer to the all cases which can be displayed on power off mode. Power off history Contents Explanation Action Details 00~09, 0A~0Z Normal operation Occurs during normal operation (Remote_Key, Local_Key etc) Normal Case 10~19, 1A~1Z Power environment Items required for power environment inspection (AC_DET etc) Power Inspection and replacement Normal Case - Settop CEC Check the settings External equipment/ Power operation by external equipment/network 20~29, 2A~2Z - TV HDMI Setting > Simple Link Menu check Network (HDMI CEC, WiFi/Lan/BT etc) - Check 'Turn on TV with mobile device' Menu on the TV Normal Case Records according to customer use (Timer setting, reservation - Check your TV's 'Reservation Time Settings' 30~39, 3A~3Z User Scene setting, no operation/no signal condition, initialization etc) - Input signal check (Auto power off after 15 minutes in case of no signal) App button operation on the remote control (Netflix key, Disney key 40~49, 4A~4Z App/CP Normal Case etc) 50~59, 5A~5Z SW Update S/Ware Update record Normal Case SW latest version check and update Main check and 60~69, 6A~6Z System Error System malfunction (need to check Main PCBA /SW) replacement 70~79, 7A~7Z AR/AOD Records left during AR/AOD operation Normal Case Normal Case - Check your TV's 'Voice Recognition 80~89, 8A~8Z WOV Operation via Voice Settings' * Turn off the function or change the sensitivity setting, etc 90~99, 9A~9Z Specific country Specific country only (satellite, disaster etc) N/A B0~B9, BA~BZ OLED(BDP) OLED only (Panel defect) OLED Module check and replacement (BDP) C0~C9, CA~CZ OLED OLED only (Compensatory action) OLED Module check and replacement (Except BDP) Checking T-con and main connection cable D0~D9, DA~DZ OLED(etc) OLED 모델 only (Fan, FPC cable error etc) Checking Fan / Heatsink Connection Status L0~L9, LA~LZ Life style Standby me model etc N/A R0~R9, RA~RZ A+ Rollable model only N/A M0~M9, MA~MZ Wireless model Wireless model only N/A Process/SVC F0~F9, FA~FZ Process/SVC Records (in-stop, Power Only etc) Normal Case - N/A Records XX Initial value Initial value not recorded yet Normal Case Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error C. Audio error date symptom No audio/ Normal video Revised date 9/17 ☞A12 ☞A13+A9 Check user N Y No audio Check audio 20V Normal menu > Off Screen normal of Power Board voltage Speaker off Y N Cancel OFF Replace Power Board and repair parts Check Speaker N Disconnection Replace MAIN Board End disconnection Y Replace Speaker Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error C. Audio error date symptom Wrecked audio/ discontinuation/noise Revised date 10/17 → abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio Wrecked audio/ ☞A13+A9 Check and replace Discontinuation/ Check audio speaker and Noise for B+ Voltage (20V) connector Check input all audio signal Y Signal -RF normal? Wrecked audio/ Y -External Input Normal signal Discontinuation/ N Replace Main B/D voltage? Noise only for D-TV N Wrecked audio/ Discontinuation/ Replace Power B/D Noise only for Analog (When RF signal is not received) Request repair to external Wrecked audio/ Replace Main B/D End cable/ANT provider Discontinuation/ Noise only for External Input (In case of N External Input Connect and check Normal signal error) other external audio? Check and fix device external device Y Check and fix external device Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error D. Function error date symptom Remote control & Local switch checking Revised date 11/17 1. Remote control(R/C) operating error Replace Main B/D ☞A14 ☞A14 ☞A14 Check & Repair N Y Y Check R/C itself Normal Y Normal Check B+3.5V Normal Check IR Normal operating? Cable connection operating? Voltage? Signal? Operation On Main B/D Output signal Connector solder N Y N N ☞A9 Check R/C Operating Check & Replace Check 3.5v on Power B/D Repair/Replace Close When turn off light Baterry of R/C Replace Power B/D or IR B/D in room Replace Main B/D (Power B/D don’t have problem) If R/C operate, Normal Y Explain the customer operating? Close cause is interference from light in room. N Replace R/C Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error D. Function error date symptom Magic Remote control operating checking Revised date 12/17 2. Magic Remote control operating error ☞A4 N N Turn off/on the Check the RF Receiver Check MR23 Normal Y Press the Is show ok ver is “00.00”? operating? message? set and press INSTART menu itself Operation wheel the wheel N Y Y ☞A15 Check & Replace Close Check & Repair Battery of MR23 RF assy connection Normal Y ☞A4 operating? Close Is show ok N Press the back RF Receiver ver N N message? key about 5sec is “00.00”? Close Y Replace Y MR23 Close Down load the Firmware * If you conduct the loop at 3times, change the MR23. * INSTART MENU  14.RF Remote control Test  3. Firmware download Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error D. Function error date symptom WiFi operating checking Revised date 13/17 3. WiFi operating error ☞A4 ☞A15 Wi-Fi Mac N Check the WiFi wafer Replace Check the Normal N value INSTART menu +3.5V_WiFi Voltage? Main B/D is “NG”? Y ☞A15 Y Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac N value Close is “NG”? Y Change the Wifi assy Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error D. Function error date symptom External device recognition error Revised date 14/17 Check technical Check Y N External Input Signal information Technical input And Component Replace Main B/D input? - Fix information information? Recognition error signal - S/W Version N Y HDMI/ Check and fix DVI, Optical Fix in Replace Main B/D external device/cable Recognition accordance error with technical information Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error D. Function error date symptom Voice Recognition Function Error Revised date 15/17 ☞A15 Check Voice Funcion Check Network Y Y Check network Connected? Recognition Function Is On In Sub Ass’y in menu menu? Cable N N Make the Connect network function ‘on’ Close Close Cable Change Voice Connection Y Recognition Change Main B/D Is OK? Ass’y N Re-connect Close Cable Close Close Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error E. Noise date symptom Circuit noise, mechanical noise Revised date 16/17 Identify Circuit Check location Replace PSU nose type noise of noise Mechanical Check location noise of noise ※ When the nose is severe, replace the module ※ Mechanical noise is a natural (For models with fix information, upgrade the phenomenon, and apply the 1st level S/W or provide the description) description. When the customer does not OR agree, apply the process by stage. ※ If there is a “Tak Tak” noise from the ※ Describe the basis of the description in cabinet, refer to the KMS fix information and “Part related to nose” in the Owner’s then proceed as shown in the solution manual Manual. (For models without any fix information, provide the description) Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Established Error F. Exterior defect date symptom Exterior defect Revised date 17/17 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Contents of Standard Repair Process Detail Technical Manual No. Error symptom Content Page Remarks 1 Check Back Light On with naked eye A1 A. Video error_ No video/Normal audio 2 Check White Balance value A2 TUNER input signal strength checking 3 A3 method A. Video error_ video error /Video 4 lag/stop Version checking method A4 5 Tuner Checking Part A5 A. Video error _Vertical/Horizontal bar, 6 Connection diagram A6 residual image, light spot Check Link Cable (Vx1/EPI) reconnection 7 A. Video error_ Color error A7 condition Check Cable (1) ~ (2) A-1/11 ~ 2/11 Exchange Main Board (1) ~ (3) A-3/11 ~ 5/11 8 Defected Type caused by T-Con/ Exchange Module (1) ~ (3) A-6/11 ~ 8/11 Module Exchange T-Con (1) ~ (2) A-9/11 ~ 10/11 Exchange Power Board(PSU) A-11/11 Continue to the next page Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Contents of Standard Repair Process Detail Technical Manual Continued from previous page No. Error symptom Content Page Remarks 9 Check front display LED(Power Indicator) A8 B. Power error_ No power 10 Check power input Voltage & ST-BY A9 B. Power error_Off 11 POWER OFF MODE checking method A11 (When on/off, while viewing) 12 Checking method in menu when there is no audio A12 C. Audio error_ No audio/Normal video Voltage and speaker checking method when there is 13 A13 no audio 14 Remote control operation checking method A14 D. Function error 15 Magic Remote/WiFi operation checking method A15 16 How to use the Service remote control A16-A18 17 E. Etc Check items after Main B/D replacement A19 18 Adjustment Test pattern - ADJ Key A20 19 F. WIFI/RF How to check WIFI/RF A21 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom A. Video error_No video/Normal audio date Revised Content Check Back Light On with naked eye A1 date If the Black light LED assemble is ‘OK’, you can see the lights on each points. A1 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom A. Video error_No video/Normal audio date Revised Content Check White Balance value A2 date Entry method 1. Press the ADJ button on the remote control for adjustment. 2. Enter into White Balance. 3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD. A2 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom A. Video error_Video error, video lag/stop date Revised Content TUNER input signal strength checking method A3 date General  Programmes  Programme Tuning  Manual Tuning When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) A3 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom A. Video error_Video error, video lag/stop date Revised Content Version checking method A4 date 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment A4 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom A. Video error_Video error, video lag/stop date TUNER checking part Revised Content A5 date Checking method: 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2. After measuring each voltage from power supply, finally replace the MAIN BOARD. A5 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error A. Video error _Vertical/Horizontal bar, Established symptom residual image, light spot date Revised Content connection diagram A6 date As the part connecting to the external input, check the screen condition by signal A6 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom A. Video error_Color error date Revised Content Check Link Cable(CEDS) reconnection condition A7 date Check the contact condition of the Link Cable, especially dust or mis insertion. A7 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Appendix. Examples of Symptoms(Image error) #1 Check for poor cable contact Symptom Item Cause Symptom Image Name CABLE Color smear Poor broken pin of FFC cable Color is Excessive due to FFC Cable CABLE R Color Excessive Contact. screen is dark due to poor contact due CABLE Screen darkness to disconnection of the FFC cable pin. G color transient due to poor FFC cable CABLE G Color Excessive connection A - 1/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Appendix. Examples of Symptoms(Image error) #2 Check for poor cable contact Symptom Item Cause Symptom Image Name CABLE Color spread LVDS cable connection problem CABLE Color spread LVDS cable connection problem CABLE Color spread LVDS cable connection problem Due to foreign substance withi nLVDS CABLE Screen stop cable PIN A - 2/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Appendix. Examples of Symptoms(Main) #3 Check parts by symptom Symptom Item Cause Symptom Image Name Main Screen noise Bit noise from horizontal screen Broken screen due to Main Screen noise Main IC problem Main Dark picture Dark left-side screen Top/bottom screen part Main Broken picture Picture problem due to tuner Inner side quality problem A - 3/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Appendix. Examples of Symptoms(Main) #4 Check parts by symptom Symptom Item Cause Symptom Image Name Main Broken screen Broken screen in a horizontal manner Main Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen A - 4/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Appendix. Examples of Symptoms(Main) #5 Check parts by symptom Symptom Item Cause Symptom Image Name No problem at the initial stage, Main Broken picture G-color spread after 10 minutes Right-side Main Screen Right-side screen problem problem LG logo Main Screen picture spread problem Screen problem No problem at the initial stage. Right-side Main During Heat run, right-side picture picture problem problem A - 5/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Appendix. Examples of Symptoms(Module) #6 Check parts by symptom Symptom Item Cause Symptom Image Name Isometric Isometric horizontal bars occur MODULE Horizontal Bar throughout the screen MODULE Internal matter BLU internal foreign matter inflow MODULE Image broken 6 block image broken MODULE Image broken Screen sync signal broken A - 6/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Appendix. Examples of Symptoms(Module) #7 Check parts by symptom Symptom Item Cause Symptom Image Name Internal damage and image breakage MODULE Image broken due to external impact Bend on the Bending due to lateral external impact MODULE screen and internal bending of BLU Vertical spreading on cube screen in no MODULE Vertical smear signal MODULE Over color Screen contour part brightly Over color A - 7/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Appendix. Examples of Symptoms(Module) #8 Check parts by symptom Symptom Item Cause Symptom Image Name MODULE Vertical bar Center Vertical Bar MODULE Screen darkness Center of the screen 1 block dark MODULE Vertical bar Center Vertical Bar Darkness at the MODULE bottom of the MODULE internal BLU breakage screen A - 8/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Appendix. Examples of Symptoms(T-Con) #9 Check parts by symptom Symptom Item Cause Symptom Image Name screen lower T-Con is defective and the picture below T-CON image broken the screen is broken screen lower T-Con is defective and the picture below T-CON image broken the screen is broken screen lower T-Con is defective and the picture below T-CON image broken the screen is broken screen lower T-Con is defective and the picture below T-CON image broken the screen is broken A - 9/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Appendix. Examples of Symptoms(T-Con) #10 Check parts by symptom Symptom Item Cause Symptom Image Name T-CON Wafer Locking The strength is T-CON Image Broken weak and cable contact failure occurs Darkness at the Initial normal operation, T-CON top of the screen upper darkness during heat run The entire screen is dark and bit noise T-CON Image Broken occurs The entire screen is dark and bit noise T-CON Image Broken occurs A - 10/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Appendix : Exchange Power Board (PSU) #11 Check parts by symptom No Light No Power On A - 11/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom B. Power error _No power date Revised Content Check front Power Indicator A8 date ST-BY condition: On or Off Power ON condition: Turn Off A8 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom B. Power error _No power date Revised Content Check power input voltage and ST-BY A9 date SET Model Power P/N, Name 86QNED80 EAY65894901, LGP86L-21SP Power Check Sequence 1. AC input Check : SK100 (100~240Vac) 2. PWR-ON Check : P201, 13 pin - SET On : above 3V - SET St-by : 0V 3. 13.2V DC Check : P201, 7~8 pin & 16~18 pin - SET On : 13.2V - SET St-by : 7.8V 4. DRV-ON Check : P201, 23 pin - SET On : above 3V - SET St-by : 0V 5. LED voltage Check : P203, 1~4 pin A9 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error symptom B. Power error _Off (when on, off while viewing) Established date Revised Content POWER OFF MODE checking method A11 date Entry method 1. Press the IN-START button of the remote control for adjustment. 2. Check the entry into adjustment item 3. A11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom C. Audio error_No audio/Normal video date Revised Content Checking method in menu when there is no audio A12 date Checking method 1. Press the Setting button on the remote control. 2. Select the Sound function of the Menu. 3. Select the Sound Out. 4. Select TV Speaker. A12 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom C. Audio error_No audio/Normal video date Voltage and speaker checking method Revised Content A13 when there is no audio date ② ① ③ Checking order when there is no audio 1. Check the contact condition of or 20V connector of Main Board. 2. Measure the 20V input voltage supplied from Power Board. (If there is no input voltage, remove and check the connector.) 3. Connect the tester RX1 to the speaker terminal and if you hear the ‘Chik~ Chik~’ sound when you touch the GND and output terminal, the speaker is normal. A13 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom D. Function error date Revised Content Remote control operation checking method A14 date ① Pin Pin name 1 +3.5V_WIFI IR & EYE Sensor 2 WIFI_DM 3 WIFI_DP 4 GND 5 WOL/WIFI_POWER_ON 6 +3.5V_WIFI 7 WIFI_SUSPEND/RESUME 8 GND 9 COMBO_RESET 10 BT_WAKEUP_HOST 11 GND ② 12 +3.5V_WIFI 13 N.C Pin #25 14 N.C ③ 15 N.C ~ 16 EYE_SDA 17 EYE_SCL Pin #1 18 GND 19 IR 20 LED_R 21 GND Checking order to check remote control 22 +3.5V_ST 23 KEY2 24 MIC_DATA 25 MIC_CLK Checking order 1. Check IR cable condition between IR & Main board.(Check picture number① and ②.) 2. Check the standby 3.5V on the terminal. (③) A14 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom D. Function error date Revised Content Magic Remote/WiFi operation checking method A15 date Pin Pin name 1 +3.5V_WIFI ① Wifi & BT Front 2 WIFI_DM 3 WIFI_DP 4 GND 5 WOL/WIFI_POWER_ON 6 +3.5V_WIFI 7 WIFI_SUSPEND/RESUME 8 GND 9 COMBO_RESET 10 BT_WAKEUP_HOST ② 11 GND Wifi & BT Rear 12 +3.5V_WIFI 13 N.C Pin #25 14 N.C ③ 15 N.C ~ 16 EYE_SDA 17 EYE_SCL Pin #1 18 GND 19 IR 20 LED_R 21 GND 22 +3.5V_ST 23 KEY2 24 MIC_DATA 25 MIC_CLK Checking order to check motion remote/wifi Checking order 1. Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2. Check the 3.5V on the terminal 1 pin. A15 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom E. Etc date Revised Content How to use the Service remote control A16 date 1. How to access the remote control 0 4 1 3 1 page 0 4 1 3 2 page A16 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom E. Etc date Revised Content How to use the Service remote control A17 date 2. Remote control part definition POWER Power On/Off [ETC] Each time pressing the KEY button, Mode gets changed to ETC and P-ONLY each time ETC (Added Function) All KEY function [PIP PR-][PIP PR+][SWAP] [PIP INPUT][DVI] KEY Function Changed to factory mode P-ONLY (Added Function) All KEY function &[INFO][STILL][HDMI HOT][USB HOT][HDMI4] KEY Action INPUT Change to the external device mode ARC Change in the order of 16:9=>Zoom1=>Zoom2=>Cinema Zoom=>Aucto Screen=>4:3=>16:9 Changes in the order of Bright Picture=>Easy Picture=>Cinema=>Spots=>Game=> PSM Custom PIcture1=>Custom Picture2=>Bright Picture SSM (Added Function) Standard(user)=>music=>cinema=>sports=>game=>standard(user) PIP Picture In Picture is activated TEXT Access to the Power Only mode CAP Broadcasting caption(on/off) MPX Stereo mode (mono, stereo, foreign language) access Used when in factory mode Simplink (Added Access to the Simplink-connected device Function) Digital EYE function ON/OFF EYE For some Model, access to the Test Pattern TILT Used for screen tilting change (Access to the old PDP control mode) A17 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom E. Etc date Revised Content How to use the Service remote control A18 date B-TOOTH Connected to Blue-Tooth (Added function) Model Nam ex) 42PG60D-NA Current Model Name S/W Version ex) IN-START V03.11.0 Current S/W version MICOM Version ex) V3.05.0 current Mi-Com version UTT ex) User TV total usage time POWER OFF STATUS ex) Shows power-off status ADJ Test Pattern (Off=>White=>Red=>Green=>Blue=>Black=>Pattern=>Off) Change X-STUDIO (Added function) HDD,USB, external device’s HDD screen is activated MENU User function gets activated EXIT Exit from the current mode TIME SHIFT (Added Moves forward/backward of recorded contents function) MUTE Mute function (0 Volume) IN-STOP SET to factory mode VOL + - Volume Up/Down CH + - Channel Up/Down AV1,2,3 (Added function) Connects to external input 1,2,3 COMP1,2 (Added function) Connects to Component 1,2 HDMI1,2,3,4 Connects to HDMI 1,2,3,4 (Add function) DVI (Add function) Connects to DVI A18 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom E. Etc date Revised Content Check items after Main B/D replacement date A19 Check the items after replacing the Main Board(Model, Serial Number, Tool option D/L ) 1. Tool Option Data 1) Need to copy “Tool Option Data” to USB(Storage device) 2) Unzip the file(USB Device) "LG_SVC_DTV.zip" Download Path : GSCS → Manual → TV option Tool 1 2 3) Insert the USB(Tool option data) 4) Check the SVC Mainboard Setting Menu 5) IN STOP(service remote)  YES Key in the model name and serial number after checking the ID label on the back cover. ※ You can select the menu in the white noise state Back key(long press – 3sec) White Noise A19 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom E. Etc date Revised Content Adjustment Test pattern - ADJ Key A20 date P-ONLY  HDMI HOT(Yellow button)  CH ‘+’ or ‘-’ You can view 11 types of patterns using the ADJ Key Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..) 4. Video error (Classification of MODULE or Main-B/D!) A20 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error Established symptom F. WIFI /RF date Revised Content How to Check Wifi / RF date A21 WiFi / Magic Search 2 page A21 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Guide to inspecting parts for symptoms of no power / no screen LG TV Check for Power cord connection Check for Power B/D defects Check for Main B/D or Module defects ☞ How to measure voltage(2/4) OLED TV Y LED Turn on the power using a remote control Measure the output voltage of Power B/D Check the front LED (12VM / 20VS)  How to check turns on Bottom front LED turns off - Check if the test pattern works - Standby mode : Red light turns on N normally - In operation : Off ☞ How to measure voltage(4/4)  Criteria Normal Y Check the input voltage of - Normal pattern: Replace Main B/D Check the power cord Power B/D → Module voltage - Defective pattern: Replace Module connection Check if the power strip is working properly N Defective Main B/D or Power B/D ☞ How to check Y How to check Main SoC LED TV_T-Conless Normal Check the sound Internalize T-Con → Main B/D ☞ How to measure voltage(1/4) Y voltage (Mute key 3 times)  How to check Y Normal - Measure the voltages of 5 points on Properly connected Measure the output voltage of N Power B/D ST-By voltage Defective Power B/D T-Con B/D Spec : 7.8V N Y Check Main B/D N Beeping sound &  Criteria Defective Power B/D Module - Normal voltage: Replace Module ☞ How to measure voltage(3/4) - Defective voltage: Replace Main B/D N Measure the output voltage of Defective SoC LED TV_T-Con Distribution completed PWR_On Check the supply voltage of Main B/D → Power B/D  How to check - Measure the voltages of 5 points on T-Con B/D Normal Y Defective Power B/D voltage  Criteria Spec : 3V or higher - Normal voltage: Replace Main B/D Defective Main B/D N - Defective voltage: Replace Module Re-connect and [For all models] Replace Power B/D Replace Main B/D Replace Power B/D Replace Main B/D If the result comes out ‘NG’ for each part, make sure to check the connector check again between the part and the cable is properly connected. (Check if the cable connection is normal) 1/1 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Note 1. How to measure ST-by 1. Measure the 12VM of Power B/D and Main B/D connector The ST-by voltage for each model may be different, so refer to the Appendix A9 page in Service Manual. 2. When measuring 12VM, it is considered normal if ST-by is7.8V and Normal is 12. (Some models launched before 2017 may have 5V / 3.5V) 3. If the result comes out ’NG’, replace Power Board ● Note. 1 / 4 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Note 2. How to measure the output voltage of Power B/D 1. Check the output voltage of Power B/D and Main B/D connector 2. Check the output voltage of 20VS and 12VM 3. If the result comes out ’NG, check the voltage of PWR_ON ● Note. 2 / 4 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Note 3. How to measure PWR On 1. Check the PWR_ON voltage of Power B/D and Main B/D connector 2. The normal power supply voltage from Main B/D to Power B/D is 3V or higher 3. If the result comes out ’NG, replace Main Board. If it comes out ‘OK’, replace Power B/D 4. The normal power supply from MAIN to POWER is 3V or higher ● PWR_ON Note. 3 / 4 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Note 4. How to measure Power B/D Module 1. Check the 21.5V and 12V voltage of Power B/D and T-Con B/D connector 2. If the result comes out ’NG, replace Power B/D. If it comes out ‘OK’, check if Main B/D and Module operate normally. Note. 4 / 4 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Appendix. How to check for OLED TV module defects OLED TV 1. Disassemble the back cover to disconnect the Main B/D Series Size Model Name V17 V18 V19 V20 V21 V22 V23 48 OLED48A* O O O 2. Check if the test pattern is working on the screen 55 OLED55A* O O O A 65 OLED65A* O O O 3. If the pattern appears, it means the Main B/D is defective (need to replace it) 77 OLED77A* O O O 55 OLED55B* O O O O O O O 4. If the pattern doesn’t appear, (keep showing no screen), B 65 OLED65B* O O O O O O O 77 OLED77B* O O O O O it means the Module is defective(need to replace it) 42 OLED42C* O O 48 OLED48C* O O O O 55 OLED55C* O O O O O O O C 65 OLED65C* O O O O O O O [Models launched before 2025] 77 83 OLED77C* OLED83C* O O O O O O O O O 55 OLED55E* O O O E 65 OLED65E* O O O 55 OLED55G* O O O O 65 OLED65G* O O O O O O O G 77 OLED77G* O O O O O O 83 OLED83G* O O 97 OLED97G* O 65 OLED65W* O O O W 77 OLED77W* O O O R.G.B pattern operation [Connecting the power cable, T-Con FFC cable to the Jig] Connect the powerboard-mainboard cable with the powerboard-JIG Power B/D T-Con // Main B/D Connect the T-Con ~ motherboard FFC cable to the Jig JIG Parts connecting Cable A jig for sending test patterns ※ SVC Part P/No : RAD33749101 Appendix. 1 / 1 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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