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LED TV
SERVICE MANUAL
CHASSIS : UB14Z
MODEL : 75QNED96TPA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71808653 (2108-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.
CONTENTS
CONTENTS ............................................................................................... 2
SAFETY PRECAUTIONS ......................................................................... 3
SERVICING PRECAUTIONS .................................................................... 4
SPECIFICATION ....................................................................................... 6
NEW FEATURE ...................................................................................... 10
SOFTWARE UPDATE ............................................................................. 17
BLOCK DIAGRAM .................................................................................. 19
EXPLODED VIEW ................................................................................... 20
ASSEMBLY / DISASSEMBLY GUIDE .................................................... 21
TROUBLE SHOOTING GUIDE ................................................. APPENDIX
-2- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
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 training and service purposes.
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
on page 3 of this publication, always follow the safety precau- ES devices.
tions. Remember: Safety First. 4. Use only an anti-static type solder removal device. Some sol-
der 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 6. Do not remove a replacement ES device from its protective
module or any other receiver assembly. package until immediately before you are ready to install it.
b. Disconnecting or reconnecting any receiver electrical plug (Most replacement ES devices are packaged with leads elec-
or other electrical connection. trically 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 mate-
installation of electrolytic capacitors may result in an explo- rial to the chassis or circuit assembly into which the device will
sion hazard. be installed.
2. Test high voltage only by measuring it with an appropriate CAUTION: Be sure no power is applied to the chassis or cir-
high voltage meter or other voltage measuring device (DVM, cuit, 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 appropri-
(by volume) isopropyl alcohol (90 % - 99 % strength) ate tip size and shape that will maintain tip temperature within
CAUTION: This is a flammable mixture. the range or 500 °F to 600 °F.
Unless specified otherwise in this service manual, lubrication 2. Use an appropriate gauge of RMA resin-core solder composed
of 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 Do not use freon-propelled spray-on cleaners.
are 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
ily by static electricity. Such components commonly are called against 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 discharg-
ing wrist strap device, which should be removed to prevent
potential shock reasons prior to applying power to the unit
under test.
-4- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
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 when-
gently prying up on the lead with the soldering iron tip as the ever 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 remain- good copper pattern. Solder the overlapped area and clip off
ing 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 training and service purposes.
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 UB14Z (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 training and service purposes.
No. Item Specification Remarks
HDMI 1 Support 4K:12Gbps, 8K : 10Gbps
HDMI HDMI 2 Support 4K:12Gbps, 8K : 10Gbps, Support ARC
7 PC / DTV Format
Input HDMI 3 Support 4K:12Gbps, 8K : 10Gbps
HDMI 4 Support 4K:12Gbps, 8K : 10Gbps
8 USB Input EMF, For SVC (download)
9 SPDIF out Optical Audio out
Ethernet Connect
10 STP cable
(1EA)
-7- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
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
-8- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
(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
9 1920*1080 67.5 60 158.4
(Reduced 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
-9- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
Copyright © 2021 LG Electronics. Inc. All rights reserved.
10 Only for training and service purposes.
Copyright © 2021 LG Electronics. Inc. All rights reserved.
11 Only for training and service purposes.
General LED Mini LED General LED Mini LED
Copyright © 2021 LG Electronics. Inc. All rights reserved.
12 Only for training and service purposes.
Copyright © 2021 LG Electronics. Inc. All rights reserved.
13 Only for training and service purposes.
Copyright © 2021 LG Electronics. Inc. All rights reserved.
14 Only for training and service purposes.
Copyright © 2021 LG Electronics. Inc. All rights reserved.
15 Only for training and service purposes.
Copyright © 2021 LG Electronics. Inc. All rights reserved.
16 Only for training and service purposes.
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
- 17 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
(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
- 18 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
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 Area OPT
13V 0.8V 13V 0.8V
LPDDR4 MICOM 50MHz 5V ( Depending on region )
Core CPU
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
Panel Vx1 (16 lane) I2C_4 NVRAM (256Kb)
Vx1
Vx1 (16 lane) eMMC 3.3V
Vx1 eMMC (8GB)
3.3V CLK/DATA/STRB
20V 5V
1.8V
USB1 (2.0)
Main SoC
Front Audio AMP OCP USB2 (2.0)
3.3V
E60
20V I2S Out USB3 (2.0) From
I2C 0
- 19 -
HDMI1 Power
Woofer Audio AMP HDMI2(ARC)
B/D
HDMI3
Wov CLK out / DataIn HDMI4
IR/Key IF
IQ (+/-), IP(+/-) IF (+/-)
IF_S 3.3V
BLOCK DIAGRAM
TS
Copyright ©
tuner
Signal Flow
SPDIF OUT
ETHERNET
USB_WIFI
I2C1
I2C3 TUNER TUNER
Supply Power Sub Assy (S,S2) (T2/C/A)
H-
3.5V_ST
In/Out Power
LNB 13V
AMP
Air/
T2/C/S/S2 H-NIM
DVB-S
MAX323
3.5V_ST Cable
Area OPT
MIC Area OPT
( Depending on region )
( Depending on region )
IR / KEY
Only training and service purposes.
LAN
SPDIF
H/P
RS-232
To WIFI/BT
Combo
IR Blaster
Area OPT
( Depending on region )
LG Electronics Inc. All rights reserved.
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.
420 Do not modify the original design without permission of manufacturer.
AS1
900
400
910
HS1
120
570
540
500
HP1
LV2
HW1
810
LV1
HD2
121
530
200D
HD1
HT1
700
820
A10
200T
+ Stand body
Stand base
A9
200
AR2
- 20 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
ASSEMBLY / DISASSEMBLY GUIDE (SET)
* Must wear gloves during repairs.
[Back Cover Handling Guide]
▪ Upper and lower handling guide – NG (In case of imbalance)
▪ Handling guide when moving the product - OK
▪ Top defect caused by imbalance
① ② ③
④ ⑤
- 21 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
[Back Cover Disassembly Guide]
(1) Lay the TV Set on a flat pad. (Disassemble Stand Assy)
(2) Disassemble B/C Screw
Screw : 21EA
- 22 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
(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 : 10EA
- 23 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
(5) With the Plastic scraper put into the gap deeply between the guide panel and the back cover on the left/
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
(6) Disassemble the latch using Plastic scraper to remove the upper latch 4EA. (outside → inside)
Top(Left) Top(Right)
Plastic scraper Plastic scraper Plastic scraper Plastic scraper
- 24 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
[Back Cover Latch assemble 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 : 10EA
(3) Connect the power cord and combine the power cord bracket from the left.
- 25 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
(4) Assemble B/C Screw
Screw : 21EA
- 26 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
TROUBLE SHOOTING GUIDE
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.
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
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
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
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
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
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
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
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
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
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
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
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 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
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 N Replace
Check the Normal
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
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
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
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)
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
Appendix : Exchange Power Board (PSU) #11 Check parts by symptom
No Light No picture/Sound Ok
A - 11/11
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
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
75QNED95/96 EAY65898111, LGP75MH-21SP
Power Check Sequence
1. AC input Check : SK100 (100~240Vac)
2. PWR-ON Check
- SET On : above 3V
- SET St-by : 0V P205 P203
3. 12V Level Check
- SET On : 12V (11.4V ~ 12.6V)
- SET St-by : 7.8Vrms (7.02Vrms ~ 8.58Vrms)
P201
4. DRV_ON Check :
- SET On : above 3V
- SET St-by : 0V
P202
5. LED voltage Check : P203,P205 (VLED pin)
- 49V (44.1V~58.8V)
- 6.1A (0A~6.1A)
SK100 (AC input)
All condition OK,Power B/D no problem
A9
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
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
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.
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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
[75QNED95/96]
①
P201
②
③
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.
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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
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)
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
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
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
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
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Standard Repair Process Detail Technical Manual
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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
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
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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
Standard Repair Process Detail Technical Manual
Error Established
symptom E. Etc date
Revised
Content Adjustment Test pattern - ADJ Key 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
