LG 86QNED99TPB

Все сервис мануалы для телевизоров LG: http://webos-forums.ru/topic3291.html LED TV SERVICE MANUAL CHASSIS : UB14Y MODEL : 86QNED99TPB 86QNED99TPZ CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL71808634 (2106-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 © 2021 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 NEW FEATURE ........................................................................................ 9 SOFTWARE UPDATE ............................................................................ 16 BLOCK DIAGRAM .................................................................................. 18 EXPLODED VIEW ................................................................................... 20 ASSEMBLY / DISASSEMBLY GUIDE .................................................... 22 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 UB14Y (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 Broadcasting system (2) Analogue TV : PAL B/B, PAL B/G, PAL D/K, PAL-I, SECAM B/G, SECAM D/K, NTSC-M 3 Program coverage 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 Analog : Upper Heterodyne - Guard Interval(Bitrate_Mbit/s) Digital : COFDM(DVB-T) Only DVB-T Model 4 Receiving system 1/4, 1/8, 1/16, 1/32, 1/128, 19/128, 19/256, Digital : COFDM(DVB-T/T2) Only DVB-T2 Model - Modulation : Code Rate Digital : QAM 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 2 Support ARC 5 HDMI Input PC / DTV Format HDMI 3 * Some models do not support HDMI3 HDMI 4 * Some models do not support HDMI4 6 USB Input My Media(Movie/Photo/Music List) or SVC 7 SPDIF out (1EA) Optical Audio out 8 Ethernet Connect 9 AV Input CVBS, Audio LR 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 (LM21U HDMI 31 3840*2160 269.73 119.88 1186.8 UDTV 2160P 3,4 port, O20N) 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 (LM21U HDMI 42 4096*2160 269.73 119.88 1186.8 UDTV 2160P 3,4 port, O20N) 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 8 1280*1024 63.98 60.02 109 SXGA Not Support 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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Copyright © 2021 LG Electronics. Inc. All rights reserved. 9 Only for training and service purposes.

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Copyright © 2021 LG Electronics. Inc. All rights reserved. 10 Only for training and service purposes.

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General LED Mini LED General LED Mini LED Copyright © 2021 LG Electronics. Inc. All rights reserved. 11 Only for training and service purposes.

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Copyright © 2021 LG Electronics. Inc. All rights reserved. 12 Only for training and service purposes.

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Copyright © 2021 LG Electronics. Inc. All rights reserved. 13 Only for training and service purposes.

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Copyright © 2021 LG Electronics. Inc. All rights reserved. 14 Only for training and service purposes.

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Copyright © 2021 LG Electronics. Inc. All rights reserved. 15 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 - 16 - 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 - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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1. E60 3.3V 1.1V 1.8V 0.95V 5V 13V 3.3V 3.5V 1.1V 3.5V 1.8V 13V 5V 13V 0.8V Normal DDR DDR Normal DDR/C4TX 0.8V 1.8V 3.3V 1.1V 3.5V_ST 0.95V 0.8V 0.8V X_TAL 13V 0.8V 13V 0.8V Area OPT LPDDR4 MICOM 50MHz 5V Core CPU ( Depending on region) 16Gb 3.5V_ST P_TS_IN 1.8V 0.8V P_TS_OUT CI Slot 3.5V LPDDR4 LPDDR4 13V 13V 13V 13V ST_BY 1.8V_AON 0.8V_AON 8Gb 8Gb 3.5V_ST To F20 Vx1 (16 lane) I2C_4 NVRAM (256Kb) Vx1 F20 Vx1 OSD (8 lane) eMMC 3.3V eMMC (8GB) 3.3V Vx1 CLK/DATA/STRB 20V 5V 1.8V I2S_TW Out USB1 (2.0) TW Audio AMP Main SoC I2C 4 OCP USB2 (2.0) 3.3V E60 3.3V USB3 (2.0) From 20V - 18 - HDMI1 Power Front Audio AMP I2S Out HDMI2(ARC) I2C 0 B/D 20V HDMI3 Wov CLK out / DataIn HDMI4 Woofer Audio AMP IR/Key IF IQ (+/-), IP(+/-) IF (+/-) IF_S 12V 3.3V Copyright © BLOCK DIAGRAM TS tuner SPDIF OUT ETHERNET USB_WIFI I2C3 TUNER TUNER Sub Assy (S,S2) (T2/C/A) H- Signal Flow 3.5V_ST Supply Power LNB 13V AMP Air/ T2/C/S/S2 H-NIM In/Out Power DVB-S MAX323 3.5V_ST Cable Area OPT Area OPT MIC ( Depending on region) ( Depending on region) IR / KEY LAN SPDIF H/P Only for training and service purposes. RS-232 To WIFI/BT Combo IR Blaster Area OPT LG Electronics Inc. All rights reserved.

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2. F20 F20_1.8V_IO SHARE_3.3V F20_0.8V_CORE F20_0.8V_DDR 13V F20 13V F20 13V F20 13V F20 SHARE_3.3V F20_0.98V To 1.8V 3.3V Core DDR DDR_PLL Panel F20_0.98V F20_1.1V_DDR F20_1.8V_LP4 DDR_PLL F20_ F20_ F20_ 0.8V_DDR 1.8V_DDR 1.1V_DDR SHARE_3.3V 1.1V SHARE_3.3V 1.8V 13V F20 X_TAL DDR DDR DDR_PLL LPDDR4 LPDDR4 24MHz From 4Gb 4Gb Main SOC Vx1 51P (16 lane) LPDDR4 Vx1 24 Lane 4Gb F20_PWM_IN[0] F20_PWM_OUT[0] F20_PWM_IN[2] F20_PWM_OUT[1] F20_PWM_IN[4] FAN0 F20 F20_PWM_OUT[2] Vx1 51P (16 lane) F20_PWM_IN[6] F20_PWM_OUT[2] - 19 - F20_SPI_S F20_I2C Vx1 51P (16 lane) From TEMP Main SOC F20_I2C Sensor Copyright © F20_SPI_MF SPI 64Mbit Vx1 51P (16 lane) Only for training and service purposes. 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. AS1 420 910 900 400 540 120 822 570 531 810 821 500 820 100 200D 530 121 101 700 200T A10 A9 200 AR2 - 20 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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EXPLODED VIEW (CABLE) LED Driver Main Board SPEAKER HS1 HP1 LV2 LV3 HD1 HD2 HW1 LV1 WIFI Power Board (Slave) IR LV4 HT1 SPEAKER Power Board (Master) Fan - 21 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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ASSEMBLY / DISASSEMBLY GUIDE (SET) * Must wear gloves during repairs. [Module & Set Handling Guide] ► Module Handling Guide - Module should be moved vertically - Do not move the module by laying it horizontally - Place your hand at 1/3 of the bottom of the module - Do not move or handle by gripping 4 corners When workers move and handle. ► Guide to lay the module down: When you have enough space for Checking or Fixing process worktable 1) Put it down vertically on the worktable. 2) Lay down on the work table (when handling more than 3 people, hold the circular display on the upper side) ► Guide to lay the module down: When you have enough space for Checking or Fixing process - Module should be moved vertically - Place your hand at 1/3 of the bottom of the module - Lay down on the work table. (one hand should hold the lower When workers move and handle. third of the module) - 22 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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► Set Handling Guide - Module should be moved vertically - Do not move the module by laying it horizontally. - Place your hand at 1/3 of the bottom of the module - Do not move or handle by gripping 4 corners. When workers move and handle. ► Guide to lay the Set down: for fixing screw or Fixing process (3-person operation) 1) Place your hand at 1/3 of the bottom of the Set 2) Lay down on the work table (when handling more than 3 people, When workers move and handle hold the square & circular display on the upper side) ► Guide to lay the Set down: for fixing screw or Fixing process (2-person operation) 1) Place your hand at 1/3 of the bottom of the Set When workers move and handle 2) Lay down on the work table (one hand should grap the lower third of the module) - 23 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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[Back Cover Diassembly Guide] (1) Lay the TV Set on a flat pad. (Disassemble Stand Assembly.) (2) Disassemble B/C Screw. Screw : 23EA (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. - 24 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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(4) Preparing B/C remove after Checking the Module Latch Position. Latch : 12EA (5) With the Plastic scraper put into the gap deeply between the guide panel and the back cover on the left side, move the Plastic scraper upwards and gently press the back cover with your hands to separate the latch 3EA and the back cover. (6) With the Plastic scraper put into the gap deeply between the guide panel and the back cover on the right side, move the Plastic scraper upwards and gently press the back cover with your hands to separate the latch 3EA and the back cover. * Do not put Plastic scraper below the baseline (based on screw hole) Base Line Base Line (7) Disassemble the latch using Plastic scraper to remove the upper latch 6EA. (outside → inside) Top(Left) Top(Right) Plastic scraper Plastic scraper Plastic scraper Plastic scraper - 25 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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[Back Cover Assembly Guide] (1) Place the B/C on top of the module and assemble the Latch position by hand(Rub softly in the direction of arrow) (2) Check the upper/left/right sides of the latch for proper assembly.→ 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 : 12EA (3) Connect the power cord and combine the power cord bracket from the left. - 26 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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(4) Assemble B/C Screw. Screw : 23ea - 27 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

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TROUBLE SHOOTING GUIDE Copyright © 2021 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 5 5 spot, external device color error 6 No power 6 Off when on, off while viewing, power auto 7 7 B. Power error on/off Off when on, off while viewing, power auto 8 8 on/off 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 15 E. Noise Circuit noise, mechanical noise 16 16 F. Exterior error Exterior defect 17 First of all, Check whether there is SVC Bulletin in GSCS System for these model. Copyright © 2021 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 ☞A10 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 list Explanation Action contents Power off when TV is not turned off during a certain time KEYTIMEOUT RESULT : micom force to trigger TV power off. Check & Change Main B/D CONDITION : When pressing power key while power on/off status, CPU does not response within 8 seconds Almost the same as Power Off by KEYTIMEOUT. If there is no vaild communication Bet ween CPU and MICOM for more than 5 seconds, the MICOM switcheds off PSU and 1SEC Power OFF Check & Change Main B/D Records. Power off by 1SEC Power off. In this case, we don’t have information where the malfunction exactly occurred. But in in indicates that CPU had stopped and rebooted. In case of AC Off (It is normal when the power cord is unplugged.) Normal ACDET If there are many ACDETs connected, Power Board is defective Check & Change Power B/D Power off by unstable AC power detect. RESULT : micom check the stable power. 5V MNT Check & Change Power B/D CONDITION : When AC on or DC on, stabilization check routine (Power Detect High Check) fail after multi power on. CPUABNORMAL If the CPU attempts to reset in case of abnormal operation and Shut Down in case of failure. Check & Change Main B/D Power off when receiving no ack. RESULT : TV power off/on (Reboot) NO POLING Check & Change Main B/D CONDITION : There is no I2C response from CPU for 15 seconds. CPUCMD Power off by main SoC command. Check & Change Main B/D INV_ERROR Power off by module error (OLED), CONDITION : OLED Module send signal to micom Check & Change OLED Module ONRF_FAIL RESULT : Reboot, CONDITION : OLED module compensation is running but fails. Check & Change OLED Module PNWASHFAIL Power off by panel noise wash function fail case. Check & Change OLED Module RESET When Micom is reset by AC Off KEY Power off by Local key OFFTIMER Power off by Off timer SLEEPTIMER Power off by sleep timer NOSIG Power off by No Signal FANSTOP Power off by FAN operation stopped INSTOP Power off by Instop Key AUTO OFF Power off by auto off function RESREC Power off by reserved recording Normal Case RECEND Power off when recording stops SWDOWN Reboot by SW down load function UNKNOWN No meaning (same as initial value) COMP_END OLED threshold voltage degradation(Compensation) completes. PNWASHDONE Power off by panel noise wash function complited. (OLED) POWER_OFF_BY_FAN_ Power off by FAN operation status. CTRL_ERROR POWER_OFF_BY_TEMPER Power off by Temperature Sensor operation status ATURE_SENSOR_ERROR Copyright © 2021 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 © 2021 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 © 2021 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 © 2021 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 Turn off/on the Check the RF Receiver N Check MR21 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 MR21 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 MR21 Close Down load the Firmware * If you conduct the loop at 3times, change the MR21. * INSTART MENU  14.RF Remote control Test  3. Firmware download Copyright © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 10 B. Power error_ No power Check power input Voltage & ST-BY A9 11 Error check by LED Indicator A10 B. Power error_Off 12 POWER OFF MODE checking method A11 (when on/off, while viewing) 13 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 14 A13 no audio 15 Remote control operation checking method A14 D. Function error 16 Magic Remote/WiFi operation checking method A15 17 How to use the Service remote control A16-A18 18 E. Etc Check items after Main B/D replacement A19 19 Adjustment Test pattern - ADJ Key A20 Copyright © 2021 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 date A1 If the Black light LED assemble is ‘OK’, you can see the lights on each points. A1 Copyright © 2021 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 date A2 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 © 2021 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 date A3 All settings  Programmes  Programme Tuning & settings  Manual Tuning When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) A3 Copyright © 2021 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 date A4 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment A4 Copyright © 2021 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 date A5 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 © 2021 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 date A6 As the part connecting to the external input, check the screen condition by signal A6 Copyright © 2021 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(VX1) reconnection condition date A7 Check the contact condition of the Link Cable, especially dust or mis insertion. A7 Copyright © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 picture/Sound Ok A - 11/11 Copyright © 2021 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 date A8 ST-BY condition: On or Off Power ON condition: Turn Off A8 Copyright © 2021 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 Power Board Voltage / Current EAY65898121 86QNED99 LGP86MH-21SP EAY65898122 Power Check Sequence 1. AC input Check : SK100 (100~240Vac) 2. PWR-ON Check - SET On : above 2.5V - SET St-by : under 0.3V EAY65898122(Slave) 3. 12V Level Check P204 - SET On : 12V (11.4V ~ 12.6V) P203 - SET St-by : 7.8Vrms (7.02Vrms ~ 8.58Vrms) 4. DRV_ON Check : - SET On : above 2.5V - SET St-by : under 0.3V 5. LED voltage Check : P204 (VLED pin) P161 P201 - 65V (58.5V~78.0V) - 7.8A (0A~7.8A) EAY65898121(Master) P202 P601 SK100 (AC input) All condition meets, Power Board OK. A9 Copyright © 2021 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 Error check by LED Indicator A10 date LED Indicator error condition (UHD Mid/High model only) 1. LED Indicator blank in each abnormal condition (Repeat each 6sec) 2. Abnormal condition 1) Open LED Protection 2) Short LED Protection 3) DC/DC voltage level check 4) P-Dim1 error 5) Driver on signal error LED Indicator 6) Local dimming data error 7) Driver IC error or MCU error check 8) V-sync error < LED Driver BD > Abnormal condition Error signal message Remark Applied Normal Operation LED blank 0 times Normal Operation Slim Direct Driver IC & MCU Communication Check LED blank 1 times DRV_IC to MCU communication Error Slim Direct LED B+ output voltage Check LED blank 2 times LED B+ OVP/UVP check Slim Direct Open LED Protection LED blank 3 times Open level detect Slim Direct Short LED Protection LED blank 4 times Short level detect Slim Direct - LED blank 5 times - - - LED blank 6 times - - Local dimming data error LED blank 7 times Local data error (Checksum & Data Length) Slim Direct V-sync signal error LED blank 8 times V-sync signal is low Slim Direct A10 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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Standard Repair Process Detail Technical Manual Error B. Power error _Off when on, off whiling viewing Established symptom date Revised Content POWER OFF MODE checking method date A11 Entry method 1. Press the IN-START button of the remote control for adjustment. 2. Check the entry into adjustment item 3. A11 Copyright © 2021 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 date A12 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 © 2021 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 Voltage and speaker checking method when there is no audio date A13 [86QNED99] ① ② ③ P201 2 SPK_R-_FT 1 SPK_R-_CT 4 SPK_R+_FT 3 SPK_R+_CT 6 SPK_L-_FT 5 SPK_L-_CT 8 SPK_L+_FT 7 SPK_L+_CT 10 SPK_L-_TW 9 SPK_R-_TW Checking order when there is no audio 12 SPK_L+_TW 11 SPK_R+_TW 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 © 2021 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 date A14 ① Pin Pin name 1 LED_R IR & EYE Sensor 2 GND 3 IR 4 +3.5V_ST 5 GND 6 GND ② 7 EYE_SCL 8 KEY2 9 EYE_SDA 10 WOV_PDM0_DATAIN 11 KEY1 12 WOV_PDM_CLKOUT Eye LED IR 13 +3.5V_WIFI 14 GND 15 COMBO_RESET ③ 16 BT_WAKEUP_HOST 17 WOL/WIFI_POWER ON 18 GND 19 +3.5V_WIFI 20 WIFI_DP 21 WIFI_SUSPEND Checking order to check remote control 22 WIFI_DM 23 GND 24 +3.5V_WIFI 25 F20_PWM_IN Checking order 26 GND 27 F20_PWM_OUT 1. Check IR cable condition between IR & Main board.(Check picture number① and ②.) 28 +13V_FAN 2. Check the standby 3.5V on the terminal. (③) 3. AS checking the Pre-Amp(IR LED light), the power is in ON condition, an Analog Tester needle should move slowly, otherwise, it’s defective. A14 Copyright © 2021 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 date A15 Pin Pin name 1 LED_R ① Wifi & BT Front 2 GND 3 IR 4 +3.5V_ST 5 GND 6 GND 7 EYE_SCL 8 KEY2 9 EYE_SDA ② 10 WOV_PDM0_DATAIN 11 KEY1 Wifi & BT Rear 12 WOV_PDM_CLKOUT 13 +3.5V_WIFI 14 GND 15 COMBO_RESET ③ 16 BT_WAKEUP_HOST 17 WOL/WIFI_POWER ON 18 GND 19 +3.5V_WIFI 20 WIFI_DP 21 WIFI_SUSPEND 22 WIFI_DM 23 GND 24 +3.5V_WIFI 25 F20_PWM_IN Checking order to check motion remote/wifi 26 GND Checking order 27 F20_PWM_OUT 28 +13V_FAN 1. Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2. Check the 3.5V on the terminal 1 pin. A15 Copyright © 2021 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 date A16 1. How to access the remote control 0 4 1 3 0 4 1 3 A16 Copyright © 2021 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 date A17 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 © 2021 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 date A18 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 © 2021 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 items afer Main B/D(Model Number D/L, White Balance) 1. Press the Service remote control instart Key. No.7 Select Model Number D/L - Key in the model name and serial number after checking the ID label on the back cover. 2. Press the Service remote control ADJ Key. No.13 Select White Balance - Record the R, G, B (GAIN, Cut) value of the color temperature before main board replacement. After replacing the main board, key in the recorded value. A19 Copyright © 2021 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 Adjustment Test pattern - ADJ Key Revised Content date A20 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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