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LG OLED48C3 SERIES SERVICE MANUAL
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SAFETY PRECAUTIONS
General Guidance
SERVICING PRECAUTIONS
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TROUBLESHOOTING GUIDE
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OLED TV
SERVICE MANUAL
CHASSIS : E*31C
MODEL : OLED48C3***
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71991222 (2212-REV00)
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means),
publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you
have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual.
The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service
Manual.
Copyright © 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONTENTS
CONTENTS ............................................................................................... 2
SAFETY PRECAUTIONS ......................................................................... 3
SERVICING PRECAUTIONS .................................................................... 4
SPECIFICATION ....................................................................................... 6
SOFTWARE UPDATE ............................................................................. 12
BLOCK DIAGRAM .................................................................................. 14
EXPLODED VIEW ................................................................................... 15
WIRING DIAGRAM ................................................................................. 16
ASSEMBLY / DISASSEMBLY GUIDE..................................................... 17
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 h t 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 E*31C (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
(1) EU / CIS / AFRICA / OCEANIA / ASIA / CHINA / HONGKONG / PHILIPPINES
No. Item Specification Remarks
1) EU/CIS/AFRICA
2) OCEANIA/ASIA
1 Market
3) CHINA/HONGKONG
4) PHILIPPINES
1) EU/CIS/AFRICA
- Digital TV : DVB-T/T2, DVB-C, DVB-S/S2,
- Analogue TV : P AL B/B, PAL B/G, PAL D/K,
PAL-I, SECAM B/G, SECAM
D/K, NTSC-M
2) OCEANIA/ASIA
- Digital TV : D
VB-T/T2, DVB-C, DVB-S/
S2(New zealand only)
- Analogue TV : P AL B/B, PAL B/G, PAL D/K,
PAL-I, SECAM B/G, SECAM
2 Broadcasting system Depending on country
D/K, NTSC-M
3) China/Hongkong
- Digital TV : D
TMB (China/Hongkong), DVB-C
(China)
- Analogue TV : P AL D/K,I, NTSC-M (China/
Hongkong)
4) Philliphine
- Digital TV : ISDB-T
- Analogue TV : NTSC-M
-6- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
No. Item Specification Remarks
# FOR EU/CIS/AFRICA/OCEANIA/ASIA
1 ) Digital TV
-DVB-T / DVB-T2*
-VHF III : 174 ~ 230 MHz
-UHF IV : 470 ~ 606 MHz
-UHF V : 606 ~ 862 MHz
-S Band II : 230 ~ 300 MHz
-S Band III : 300 ~ 470 MHz
-DVB-S/S2* (950 ~ 2150 MHz)
-DVB-C* (46 ~ 890 MHz)
2) Analogue TV (46 ~ 862 MHz)
# FOR CHINA # EU/CIS : Depending on models.
1) PAL-DK:VHF/UHF 1~62, Cable:1~41 # AFRICA : Depending on countrys.
3 Program coverage
2) PAL-I: VHF/UHF 1~69, Cable:1~47 # OCEANIA/ASIA : Only DVB-T2/C/S2 support model only.
3) NTSC M: VHF/UHF 2~78, Cable:1~71 # China/Hongkong/Philippine separate marketing
4) DTMB:1~62
5) DVB-C:52.5MHz~866MHz
# FOR HONGKONG
1) PAL-DK:VHF/UHF 1~69, Cable:1~47
2) PAL-I: VHF/UHF 1~69, Cable:1~47
3) NTSC M: VHF/UHF 2~78, Cable:1~71
4) DTMB:21~69
# FOR Philippine
1) ISDB-T: UHF : 2~69
2) NTSC M: VHF/UHF : 2~69, CATV: 1~135
# EU/CIS/AFRICA/OCEANIA/ASIA
► DVB-T
- Guard Interval(Bitrate_Mbit/s): 1/4, 1/8, 1/16, 1/32
- Modulation: Code Rate
QPSK : 1/2, 2/3, 3/4, 5/6, 7/8
16-QAM : 1/2, 2/3, 3/4, 5/6, 7/8
64-QAM : 1/2, 2/3, 3/4, 5/6, 7/8
► DVB-T2
- Guard Interval(Bitrate_Mbit/s)
1/4, 1/8, 1/16, 1/32, 1/128, 19/128, 19/256,
- Modulation : Code Rate
QPSK : 1/2, 2/5, 2/3, 3/4, 5/6
16-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
64-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
256-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
► DVB-C
- Symbolrate: 4.0Msymbols/s to 7.2Msymbols/s
# EU/CIS/AFRICA/OCEANIA/ASIA
- Modulation: 16QAM, 64-QAM, 128-QAM and 256-QAM
Analog : Upper Heterodyne
► DVB-S/S2(Except Asia)
Digital : COFDM(DVB-T) Only DVB-T Model
- Symbolrate
Digital : COFDM(DVB-T/T2) Only DVB-T2 Model
DVB-S2 (8PSK / QPSK) : 2 ~ 45Msymbol/s
Digital : QAM
4 Receiving system DVB-S (QPSK) : 2 ~ 45Msymbol/s
- Viterbi
DVB-S mode : 1/2, 2/3, 3/4, 5/6, 7/8
# China/Hongkong
DVB-S2 mode: 1/2, 2/3, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10
Analog : Upper Heterodyne
Digital : COFDM, QAM
#China/Hongkong
► DTMB ( Carrier, Code Rate, Constellation, Frame Header, Interleaving)
* China
- MODE1 : 3780, 0.4, 16QAM, PN945/VARIABLE, 720
- MODE2 : 1, 0.8, 4QAM, PN595, 720
- MODE3 : 3780, 0.6, 16QAM, PN945/VARIABLE, 720
- MODE4 : 1, 0.8, 16QAM, PN595, 720
- MODE5 : 3780, 0.8, 16QAM, PN420/VARIABLE, 720
- MODE6 : 3780, 0.6, 64QAM, PN420/VARIABLE, 720
- MODE7 : 1, 0.8, 32QAM, PN595, 720
- MODE8 : 3780, 0.8, 16QAM, PN945/VARIABLE, 720
- MODE9 : 3780, 0.6, 64QAM, PN945/VARIABLE, 720
- MODE10 : 3780, 0.8, 64QAM, PN420/VARIABLE, 720
* Hong Kong - 3780, 0.4/0.6, 4/16/64QAM, PN945, 720
► DVB-C
- Symbolrate : 4.0Msymbols/s to 7.2Msymbols/s
- Modulation : 16QAM, 64-QAM, 128-QAM and 256-QAM
-7- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
No. Item Specification Remarks
Antenna, HDMI1, HDMI2, HDMI3, HDMI4 USB1,
5 Head Phone out Depending on country
USB2, USB3, AV
HDMI1
HDMI HDMI2
6 PC / DTV Format Support HDMI2.1
Input HDMI3
HDMI4
7 Video Input RCA PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC, PAL60
8 Audio Input DVI Audio, Component, AV
9 SPDIF out (1 EA) Optical Audio out
10 USB Input (3 EA) EMF, For SVC (download)
Ethernet Connect
11 STP cable
(1EA)
PCMCIA Card slot
12 PCMCIA Slot only EU/CIS
(1EA)
(2) North America / Central and South America / Colombia / Taiwan / Mexico
No. Item Specification Remarks
North America / Central and South America /
1 Market
Colombia / Taiwan / Japan / Mexico
ATSC / NTSC-M, 64 & 256 QAM North America
Digital : SBTVD (ISDBT)
Cenrtal and South America
Analog : NTSC / PAL-M / PAL-N
Digital : DVB-T / T2
Colombia / Panama
2 Broadcasting system Analog : NTSC / PAL-M / PAL-N
Digital : ATSC, 64 & 256 QAM
Mexico
Analog : NTSC-M
Digital : DVB-T
Taiwan
Analog : NTSC-M
VHF 2 ~ 13
UHF 14 ~ 69
DTV 2 ~ 69 North America / Mexico
CATV 1 ~ 135
CADTV 1 ~ 135
VHF 2 ~ 13
3 Available Channel UHF 14 ~ 69
Cenrtal and South America
DTV 2 ~ 69
CATV 1 ~ 135
VHF 2 ~ 13
UHF 14 ~ 69
Colombia / Panama / Taiwan
DTV 2 ~ 69
CATV 1 ~ 125
-8- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
No. Item Specification Remarks
Digital : ATSC, 64 & 256 QAM
for North America / Mexico model
Analog : NTSC-M
Digital : SBTVD (ISDBT)
for Central and South America model
Analog : NTSC / PAL-M / PAL-N
for Panama and Taiwan
► DVB-T
- Guard Interval(Bitrate_Mbit/s)
Digital : DVB-T 1/4, 1/8, 1/16, 1/32
Analog : NTSC / PAL-M / PAL-N - Modulation : Code Rate
4 Receiving system QPSK/16-QAM/64-QAM
- Code Rate
1/2, 2/3, 3/4, 5/6, 7/8
for Colombia
► DVB-T2
- Guard Interval(Bitrate_Mbit/s)
Digital : DVB-T2 1/4, 19/256, 1/8, 1/16, 1/32, 1/128
Analog : NTSC / PAL-M / PAL-N - Modulation
QPSK, 16-QAM, 64-QAM, 256QAM
- Code Rate
1/2, 3/5, 2/3, 3/4, 4/5, 5/6
HDMI 1
HDMI 2
5 HDMI Input PC / DTV Format Support HDMI2.1
HDMI 3
HDMI 4
SPDIF(1EA) Optical Audio out
6 Audio out
HeadPhone(1EA) HeadPhone out
7 USB Input (3EA) EMF, DivX HD, For SVC (download) JPEG, MP3, DivX HD
8 Ethernet Connect (1EA) Ethernet Connect
-9- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
5. External Input Support Format
5.1. HDMI input(DTV)
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remarks
1 640*480 31.46 59.94 25.125 SDTV 480P
2 640*480 31.50 60.00 25.125 SDTV 480P
3 720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I)
4 720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I) Spec. out but display
5 720*576 15.62 50.00 13.500 SDTV, DVD 576I(625I) 50Hz
6 720*480 31.47 59.94 27 SDTV 480P
7 720*480 31.50 60.00 27.027 SDTV 480P
8 720*576 31.25 50.00 27 SDTV 576P
9 1280*720 37.5 50.00 74.25 HDTV 720P
10 1280*720 44.96 59.94 74.176 HDTV 720P
11 1280*720 45.00 60.00 74.25 HDTV 720P
12 1920*1080 33.72 59.94 74.176 HDTV 1080I
13 1920*1080 33.75 60.00 74.25 HDTV 1080I
14 1920*1080 28.12 50.00 74.25 HDTV 1080I
15 1920*1080 26.97 23.97 63.296 HDTV 1080P
16 1920*1080 27.00 24.00 63.36 HDTV 1080P
17 1920*1080 33.71 29.97 79.120 HDTV 1080P
18 1920*1080 33.75 30.00 79.20 HDTV 1080P
19 1920*1080 56.25 50.00 148.5 HDTV 1080P
20 1920*1080 67.43 59.94 148.350 HDTV 1080P
21 1920*1080 67.50 60.00 148.50 HDTV 1080P
22 1920*1080 135.00 120.00 HDTV 1080P
23 1920*1080 134.86 119.88 HDTV 1080P
24 1920*1080 112.50 100.00 HDTV 1080P
25 3840*2160 53.95 23.98 296.703 UDTV 2160P
26 3840*2160 54.00 24.00 297.00 UDTV 2160P
27 3840*2160 56.25 25.00 297.00 UDTV 2160P
28 3840*2160 61.43 29.97 296.703 UDTV 2160P
29 3840*2160 67.50 30.00 297.00 UDTV 2160P
When HDMI
30 3840*2160 112.5 50.00 594 UDTV 2160P
UHD DEEP COLOUR ON
When HDMI
31 3840*2160 134.86 59.94 593.407 UDTV 2160P
UHD DEEP COLOUR ON
When HDMI
32 3840*2160 135.00 60.00 594 UDTV 2160P
UHD DEEP COLOUR ON
33 4096*2160 53.95 23.98 296.703 UDTV 2160P
34 4096*2160 54.00 24.00 297 UDTV 2160P
35 4096*2160 56.25 25.00 297 UDTV 2160P
36 4096*2160 61.43 29.97 296.703 UDTV 2160P
37 4096*2160 67.50 30.00 297 UDTV 2160P
When HDMI
38 4096*2160 112.50 50.00 594 UDTV 2160P
UHD DEEP COLOUR ON
When HDMI
39 4096*2160 134.86 59.94 593.407 UDTV 2160P
UHD DEEP COLOUR ON
When HDMI
40 4096*2160 135.00 60.00 594 UDTV 2160P
UHD DEEP COLOUR ON
- 10 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
5.2. HDMI Input (PC)
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 60.00 65 VESA(XGA)
6 1152*864 54.34 60.05 80 VESA
7 1360*768 47.71 60.01 84.75 VESA(WXGA)
8 1280*1024 63.98 60.02 109.00 SXGA Support to HDMI-PC
9 1920*1080 67.50 60.00 158.40 WUXGA(Reduced Blanking)
10 1920*1080 135 120
11 3840*2160 54 24.00 297.00 UDTV 2160P
12 3840*2160 56.25 25.00 297.00 UDTV 2160P
13 3840*2160 67.5 30.00 297.00 UDTV 2160P
14 4096*2160 53.95 23.97 296.703 UDTV 2160P
15 4096*2160 54 24 297 UDTV 2160P
- 11 - Copyright © LG Electronics Inc. All rights reserved.
Only 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
- 12 - 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
- 13 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
1.1V 1.8V 0.8V 0.8V
3.3V 3.3V 3.3V AVD33 DVD33 5V 5V 3.5V 3.5V 3.5V DVD33
NORMAL EMMC TU HDMI NORMAL CI_ON ST AON TU AON
3.5V 3.5V
13V 13V 5V 13V 3.5V ST 1.1V ST 1.8V 13V 0.8V 13V 0.8V
3.3V
Normal Normal ST_BY DDR DDR Core CPU
0.8V
1.8V 1.1V 1.8V 1.1V 0.8V 1.8V 3.3V 1.1V 3.5V_ST
X_TAL
13V 0.8V
LPDDR4 LPDDR4 MICOM 50MHz 5V
AON 8GB
12GB
(IC401) (IC402) P_TS_IN
P_TS_OUT CI Slot 13V
To
3.5V_ST
Panel Vx1 (8 lane)
Vx1 I2C_4 NVRAM (256Kb)
Vx1 (8 lane) eMMC 3.3V
Vx1 eMMC (8GB)
3.3V CLK/DATA/STRB
13V 5V
1.8V
USB1 (2.0)
Main SoC
Front Audio AMP I2S Out OCP USB2 (2.0)
13V 3.3V I2C 0 USB3 (2.0) From
- 14 -
HDMI1 Power
Woofer Audio AMP HDMI2(ARC) B/D
HDMI3
Wov CLK out / DataIn HDMI4
Signal Flow
IR/Key IF
Supply Power IQ (+/-), IP(+/-) IF (+/-)
IF_S
In/out Power 3.3V
BLOCK DIAGRAM
Copyright ©
TS
SPDIF OUT
ETHERNET
CVBS
USB_WIFI
I2C1
RS232 I2C3 TUNER TUNER
Sub Assy (S,S2) (T2/C/A)
3.5V_ST
LNB 13V
AMP
ICL3232
Air/
T2/C/S/S2 H-NIM tuner
DVB-S
3.5V_ST Cable
MIC
IR / KEY
Only training and service purposes.
LAN
SPDIF
H/P
To WIFI/BT
AV/RS232
Combo
IR Blaster
Area OPT
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.
Do not modify the original design without permission of manufacturer.
951
AE2
920
Depending on model
A10
910
AW1
AE1
AH1
AC1
400
710
AB5
571
A9
900
ARC2
570
AR2
521
120
540
500
800
121
530
810
200
- 15 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
WIRING DIAGRAM
HP1
HT1 LV2
Power Board Main Board
HT2
LV1
HW1
700
HS1
SPEAKER SPEAKER WIFI
IR
HT1 HT2 HS1
HW1
LV1 LV2
HP1
- 16 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
ASSEMBLY / DISASSEMBLY GUIDE
* Preparation Tool
- Driver
- Gloves
1. Remove the Small rear cover / Stand / Power Cord Bracket / Back cover
(1) Sep-up the TV set with the Cover Rear Top is pointing upside.
(2) Remove Small rear cover.(Push upper SnapFit & lift up)
- 17 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
(3-1) Remove screws to remove the stand.(Tool set up : Screw driver with “+” tip.)
(3-2) Remove the stand.
(4) Remove screw & cable to remove the Power cord Bracket.
- 18 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
(5-1) Remove screws to remove the back cover.(Tool set up : Screw driver with “+” tip.)
(5-2) Remove the back cover in lifting slowly from below.
- 19 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
2. Remove the internal power supply and main PCB
- You can remove the internal items after removing back cover and stand
(6-1) Remove screws to remove internal power supply.(Tool set up : Screw driver with “+” tip.)
Remove connecter to remove internal power supply.
(6-2) Remove the internal power supply.
- 20 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
(7-1) Remove screws to remove internal Main PCB(Tool set up : Screw driver with “+” tip.)
Remove connecter to remove internal Main PCB
(7-2) Remove the internal Main PCB.
- 21 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
3. Remove the Speaker, WiFi-BT module, Stand supporter, VESA supporte.r
- You can remove the display module after removing B/C, stand, power PCB,
main PCB
(8) Remove the speaker units.(Connectors are already pulled-out when we remove the main PCB, so we can remove them at once
without any connectors.)
(9) Remove screw to remove WIFI module.(Tool set up : Screw driver with “+” tip.)
And remove the WIFI, BT module.
- 22 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
(10) Remove screw to remove Stand Supporter. (Tool set up : Screw driver with “+” tip.)
And remove the Stand supporter.
(11) Remove screw to remove VESA Supporter. (Tool set up : Screw driver with “+” tip.)
And remove the VESA supporter.
(12) Complete
- 23 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
TROUBLE SHOOTING GUIDE
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
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 MR23 operating checking 12
D. Function error
13 WiFi operating checking 13
14 External device recognition error 14
15 E. Noise Circuit noise, mechanical noise 15
16 F. Exterior error Exterior defect 16
First of all, Check whether there is SVC Bulletin in GSCS System for these model.
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error A. Video error date
symptom
No video/ Normal audio Revised date
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, LVDS or EPI Cable, Speaker Cable, IR B/D Cable,,,)
☞A1 ☞A9
Y Y Y
No video Normal Check Back Light Check Power Board Normal Replace T-con/Main
On
Normal audio audio On with naked eye 20V, 12V etc. voltage Board or module
N N N
Move to No Repair Power
☞A9 Check Power Board 20V output
video/No audio Board or parts
Y
Normal Replace Inverter
voltage or module
N End
Repair Power
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
1
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error A. Video error date
symptom
No video/ No audio Revised date
☞A9
No Video/ Check various Check and
Normal Y
No audio voltages of Power replace
Board (20V,12V…) voltage?
MAIN B/D
N
End
Replace Power
Board and repair
parts
2
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error A. Video error date
symptom
Picture broken/ Freezing Revised date
. 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
Y Check N Y
Connection Normal SVC Check Tuner
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
3
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error A. Video error date
symptom
Color error Revised date
☞ A7
☞A6 ※ Check and
Check color by input replace Link
-External Input Y Cable Y Y
Color Color Color
-AV (Vx1 Cable) Replace Main B/D Replace module
error? error? error?
-HDMI and contact
condition N
N N
Check error End
color input
mode
Check external External Y
External Input
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
4
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error A. Video error date
symptom Vertical / Horizontal bar, residual image,
light spot, external device color error Revised date
Vertical/Horizontal bar, residual image, light spot Replace
Module
☞A6
Check
☞ A7 N
Check color condition
external Check and
by input Screen Y Y Screen N Screen
device Normal? replace Link Replace Main B/D
-External Input normal? normal? normal?
connection Cable
-HDMI
condition
N Y Y
N
Replace Request repair End End
module for external
device
External device screen error-Color error
Check screen
N condition by input External Connect other external
Check S/W Version Check Input
-External Input device and cable
version error N Replace
-Component (Check normal operation of
Screen
-HDMI/DVI External Input, HDMI/DVI Main/T-con
normal?
by connecting Jig, pattern B/D
Y
Generator ,Set-top Box etc. Y
S/W Upgrade
Request repair for
external device
Connect other external Y
Normal N device and cable
screen? (Check normal operation of N Replace
HDMI/ Screen
External Input, HDMI/DVI by Main/T-con
DVI normal?
connecting Jig, pattern B/D
Y Generator ,Set-top Box etc.
End
5
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error B. Power error date
symptom
No power Revised date
☞A8 ☞A9
Y DC Power on N Y
Check Power Normal Check Power Replace
by pressing Power Key OK?
LED LED On? operation? On ‘”High” Power B/D
On Remote control
. Stand-By: Red or Turn On
N Y
. 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 Main ST-BY 7.8V Y
voltage? N
☞A9
N Replace Power B/D
Replace Power B/D
6
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error B. Power error date
symptom
Off when on, off while viewing, power auto on/off Revised date
Check outlet
☞A10
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 Abnormal
power out Replace Power B/D
1
Fix A/C cord & Outlet ☞A9
and check each 2 (If Power Off mode
phase out 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
7
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error B. Power error date
symptom
Off when on, off while viewing, power auto on/off Revised date
* Please refer to the all cases which can be displayed on power off mode.
Action contents
Normal Code
Check the Power & Power B/D
Normal Code – Check the Settop Box CEC
External device
External device - HDMI Setting > Check the Simplelink Menu
- Check the “TV On With Mobile” Menu
Normal Code - Check the “Power On(Off) Timer” Menu
- Check the Input Signal ( No Signal >auto
power off after 15min)
Normal Code
Normal Code
Need to Check SW version(Last version) & Main B/D
Normal Code
Normal Code – Check the Voice Recognition Settings
N/A
Check the OLED Module ( BDP )
Check the OLED Module ( Without BDP )
Check the FFC Cable (T-con to Main)
Check the Fan & Heat Plate
N/A
N/A
N/A
Normal Code - N/A
Normal Code
8
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error C. Audio error date
symptom
No audio/ Normal video Revised date
☞A11 ☞A12+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
9
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error C. Audio error date
symptom
Wrecked audio/ discontinuation/noise Revised date
→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio
Wrecked audio/
☞A12+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
10
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error D. Function error date
symptom
Remote control & Local switch checking Revised date
1. Remote control(R/C) operating error Replace
Main B/D
☞A13 ☞A13 ☞A13
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 7.8v 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
operating? Close
Explain the customer
cause is interference
from light in room. N
Replace R/C
11
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error D. Function error date
symptom
Magic remote operating checking Revised date
2. MR23(Magic Remote control) operating error
☞A4
Turn off/on the
Check the RF Receiver N Check MR23 Normal Y Press the Is show ok N
Ver is “00.00”? operating? message? set and press
INSTART menu itself Operation wheel
the wheel
N Y
Y
☞A14
Check & Replace Close
Check & Repair Battery of MR23
RF assy
connection
Normal Y
☞A4 Close
operating?
Is show ok N Press the back
RF Receiver N N message? key about 5sec
Close
ver is “00.00”?
Y
Replace
MR23
Y Close
Replace MR23
* If you conduct the loop at 3times, change the MR23.
12
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error D. Function error date
symptom
Wifi operating checking Revised date
3.Wifi operating error
☞A4 ☞A14
Check the Wi-Fi Mac N Check the Wifi wafer Normal N Replace
INSTART menu value is “NG”? 1pin Voltage? Main B/D
Y
☞A14 Y
Close
Check & Repair
Wifi cable
connection
☞A4
Wi-Fi Mac value N
Close
is “NG”?
Y
Change the Wifi
assy
13
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error D. Function error date
symptom
External device recognition error Revised date
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 Recognition Replace Main B/D
external device/cable accordance error
with technical
information
14
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error E. Noise date
symptom
Circuit noise, mechanical noise Revised date
Identify Circuit Check location
Replace PSU
nose type noise of noise
Mechanical Check location of
noise 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)
15
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error F. Exterior defect date
symptom
Exterior defect Revised date
Zoom part with Module
Replace module
exterior damage damage
Cabinet
Replace cabinet
damage
Remote
control Replace remote control
damage
Stand
Replace stand
dent
16
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Contents of Standard Repair Process Detail Technical Manual
No. Error symptom Content Page Remarks
1 A. Video error_ No video/Normal audio Check Vx1 lock A1
TUNER input signal strength checking
2 A3
method
A. Video error_ video error /Video
3 lag/stop Version checking method A4
4 Tuner Checking Part A5
A. Video error _Vertical/Horizontal bar,
5 Connection diagram A6
residual image, light spot
Check Link Cable (Vx1/EPI) reconnection
6 A. Video error_ Color error A7
condition
A-1/11
Check Cable (1) ~ (2)
A-2/11
Exchange Main Board (1) ~ (3) A-3/11 ~ A-5/11
7 Defected Type caused by T-Con/
Inverter/ Module Exchange Module (1) ~ (3) A-6/11 ~ A-8/11
Exchange T-Con (1) ~ (2) A-9/11 ~ A-10/11
Exchange Power Board(PSU) A-11/11
Continue to the next page
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Contents of Standard Repair Process Detail Technical Manual
Continued from previous page
No. Error symptom Content Page Remarks
8 Check front display LED A8
B. Power error_ No power
9 Check power input Voltage & Main ST-BY 3.5V A9
B. Power error_Off
10 POWER OFF MODE checking method A10
(when on/off, while viewing)
11 Checking method in menu when there is no audio A11
C. Audio error_ No audio/Normal
video Voltage and speaker checking method when there is
12 A12
no audio
13 Remote control operation checking method A13
D. Function error
14 Motion Remote operation checking method A14
15 How to use the Service remote control A15-A17
E. Etc
16 Check items after Main B/D replacement A18
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom A. Video error_No video/Normal audio date
Revised
Content Check Vx1 lock A1
date
R7624: TV On -> Low(0V), Vx1 : OK
R7632
Check a voltage of R7624 (Red) after turn on the TV. ※ Reference: Burnt Detect Measurement Point
If the voltage is low, Vx1 is locked.(OK) Check the voltage of R7632 (Blue) while turning on TV power
Low (0V) : Normal, High (3.3V) : Burnt Detect
A1
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom A. Video error_Video error, video lag/stop date
TUNER input signal strength checking method Revised
Content date A3
All settings General Programmes
Programme Tuning & settings
Manual Tuning
When the signal is strong,
use the attenuator
(-10dB, -15dB, -20dB etc.)
A3
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom A. Video error_Video error, video lag/stop date
Version checking method Revised
Content date A4
1. Checking method for remote control for adjustment
Version
Press the IN-START with the remote
control for adjustment
A4
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom
A. Video error_Video error, video lag/stop
date
Revised
Content TUNER checking part A5
date
Checking method:
1. Check the signal strength or check whether the screen is normal when the external device is connected.
2. After measuring each voltage from power supply, finally replace the MAIN BOARD.
A5
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
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 © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
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 © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Image error) Check for poor cable contact
Symptom
Item Cause Symptom Image
Name
CABLE Color smear Poor broken pin of FFC cable
Color is Excessive due to FFC Cable
CABLE R Color Excessive
Contact.
screen is dark due to poor contact due
CABLE Screen darkness to disconnection of the FFC cable pin.
G color transient due to poor FFC cable
CABLE G Color Excessive connection
A - 1/11
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Image error) Check for poor cable contact
Symptom
Item Cause Symptom Image
Name
CABLE Color spread LVDS cable connection problem
CABLE Color spread LVDS cable connection problem
CABLE Color spread LVDS cable connection problem
Due to foreign substance withi nLVDS
CABLE Screen stop cable PIN
A - 2/11
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Main) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
Main Screen noise Bit noise from horizontal screen
Broken screen due to
Main Screen noise
Main IC problem
Main Dark picture Dark left-side screen
Top/bottom screen part
Main Broken picture
Picture problem due to tuner
Inner side quality problem
A - 3/11
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Main) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
Main Broken screen Broken screen in a horizontal manner
Main Screen spread Screen corner appears blurry
Main Color Spread Color spread on the screen
Main Blurry Screen Blurry picture on the screen
A - 4/11
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Main) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
No problem at the initial stage,
Main Broken picture G-color spread after 10 minutes
Right-side
Main
Screen Right-side screen problem
problem
LG logo
Main Screen picture spread problem
Screen problem
No problem at the initial stage.
Right-side
Main During Heat run, right-side picture
picture problem
problem
A - 5/11
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Module) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
Isometric Isometric horizontal bars occur
MODULE
Horizontal Bar throughout the screen
MODULE Internal matter BLU internal foreign matter inflow
MODULE Image broken 6 block image broken
MODULE Image broken Screen sync signal broken
A - 6/11
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Module) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
Internal damage and image breakage
MODULE Image broken
due to external impact
Bend on the Bending due to lateral external impact
MODULE
screen and internal bending of BLU
Vertical spreading on cube screen in no
MODULE Vertical smear
signal
MODULE Over color Screen contour part brightly Over color
A - 7/11
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(Module) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
MODULE Vertical bar Center Vertical Bar
MODULE Screen darkness Center of the screen 1 block dark
MODULE Vertical bar Center Vertical Bar
Darkness at the
MODULE bottom of the MODULE internal BLU breakage
screen
A - 8/11
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(T-Con) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
screen lower T-Con is defective and the picture below
T-CON
image broken the screen is broken
screen lower T-Con is defective and the picture below
T-CON
image broken the screen is broken
screen lower T-Con is defective and the picture below
T-CON
image broken the screen is broken
screen lower T-Con is defective and the picture below
T-CON
image broken the screen is broken
A - 9/11
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix. Examples of Symptoms(T-Con) Check parts by symptom
Symptom
Item Cause Symptom Image
Name
T-CON Wafer Locking The strength is
T-CON Image Broken
weak and cable contact failure occurs
Darkness at the Initial normal operation,
T-CON
top of the screen upper darkness during heat run
The entire screen is dark and bit noise
T-CON Image Broken
occurs
The entire screen is dark and bit noise
T-CON Image Broken
occurs
A - 10/11
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix : Exchange Power Board (PSU)
No Light No picture/Sound Ok
A - 11/11
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
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 © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom
B. Power error _No power
date
Revised
Content Check power input voltage and ST-BY 7.8V A9
date
SET Model Power P/N, Name
OLED48C3 EAY65768829, LGP48C3-23OP DC 12VM Line Check (ST-
BY : 7.8V, Normal : 12V)
Power Check Sequence
1. AC input Check : 100~240Vac
2. PWR-ON Check : P201
- SET On : above 3V
- SET St-by : 0V
P201
3. 12V Level Check : P201
- SET On : 12V
- SET St-by : 7.8V (swing between 7V to 10V)
P252
4. DRV_ON Check : P201
- SET On : above 2.5V P251
- SET St-by : 0V
AC INPUT
5. T-CON 22V Check : P251
- SET On : above 22V
- SET St-by : 0V
6. T-CON 12V Check : P202
- SET On : above 12V
- SET St-by : 0V
All condition meets, Power Board OK.
A9
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error
symptom B. Power error _Off when on, off whiling viewing Established
date
Revised
Content POWER OFF MODE checking method date A10
1 Page
Entry method
1. Press the IN-START button of the
remote control for adjustment.
2. Press the navigation key(Right) 3 2 Page
times, entry into SVC menu 2 page.
A10
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
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 A11
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.
A11
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom C. Audio error_No audio/Normal video date
Voltage and speaker checking method Revised
Content date A12
when there is no audio
P201
②
①
P252
P251
Checking order when there is no audio
1. Check the contact condition of or 20V connector of Main Board.
2. Measure the 20V input voltage supplied from Power Board.
(If there is no input voltage, remove and check the connector.)
3. Connect the tester P5400 to the speaker terminal and if you hear the ‘Chik~ Chik~’
sound when you touch the GND and output terminal, the speaker is normal.
A12
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom D. Function error date
Revised
Content Remote control operation checking method date A13
IR & EYE Sensor Pin Pin name
1 +3.5V_WIFI
2 WIFI_DM
IR 3 WIFI_DP
4 GND
5 WOL/WIFI_PWR_ON
6 +3.5V_WIFI
① 7 WIFI_SUSPEND/RESUME
LED Eye 8 GND
9 COMBO_RESET
10 BT_WAKE_UP_HOST
11 GND
② 12 +3.5V_WIFI
13 EYE_SDA
14 EYE_SCL
③ 15 GND
16 GND
17 IR
18 LED_R
19 GND
20 GND
21 +3.5V_ST
Checking order to check remote control 22 +3.5V_ST
23 +3.5V_ST
24 KEY2
25 WOV_PDMO_DATAIN
Checking order 26 WOV_PDM_CLKOUT
1. Check IR cable condition between IR & Main board.(Check picture number① and ②.)
2. Check the Main 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.
A13
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom D. Function error date
Revised
Content Magic Remote/WiFi operation checking method date A14
Pin Pin name
1 +3.5V_WIFI
2 WIFI_DM
3 WIFI_DP
① Wifi & BT Front 4 GND
5 WOL/WIFI_PWR_ON
6 +3.5V_WIFI
7 WIFI_SUSPEND/RESUME
8 GND
9 COMBO_RESET
③ 10 BT_WAKE_UP_HOST
11 GND
Wifi & BT Rear 12 +3.5V_WIFI
13 EYE_SDA
② 14 EYE_SCL
15 GND
16 GND
17 IR
18 LED_R
19 GND
20 GND
21 +3.5V_ST
22 +3.5V_ST
Checking order to check motion remote/wifi 23 +3.5V_ST
24 KEY2
Checking order 25 WOV_PDMO_DATAIN
26 WOV_PDM_CLKOUT
1.Check BT/Wifi cable condition between BT/Wifi assy & Main board.
2.Check the Main 3.5V on the terminal 1 pin
A14
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom E. Etc date
Revised
Content How to use the Service remote control date A15
1. How to access the remote control
0 4 1 3
1 page
Press the button 3times.
2 page
A15
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom E. Etc date
Revised
Content How to use the Service remote control date A16
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)
A16
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom E. Etc date
Revised
Content How to use the Service remote control date A17
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
A17
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom E. Etc
date
Revised
Content How to use the Service remote control date A18
Check items afer Main B/D (Model, Serial Number, Tool option D/L)
1. Change tool option data
1) Download tool option data from GSSC system to USB(Storage device) 2) Unzip the file(USB Device) "LG_SVC_DTV.zip"
Download path : GSCS → Manual → TV option Tool
1
2
3) Insert USB(tool option data) 4) When connected via USB, the setting menu is displayed. 5) Press IN STOP YES
Enter ‘Model name.suffix’ and ‘serial number’
2. Problem solution
If the TV Screen is a white pattern and the pop-up window does not appear when connecting USB.
Press the “BACK" or “EXIT” on the remote controller for 3 seconds to switch to White noise screen.
A18
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Guide to inspecting parts for symptoms of no power / no screen LG TV
Check for Power cord connection Check for Power B/D defects Check for Main B/D or Module defects
☞ How to measure voltage(2/4)
OLED TV
Y
LED Turn on the power using a remote control Measure the output voltage of Power B/D
Check the front LED (12VM / 20VS) How to check
turns on Bottom front LED turns off
- Check if the test pattern works
- Standby mode : Red light turns on N normally
- In operation : Off ☞ How to measure voltage(4/4)
Criteria
Normal Y Check the input voltage of - Normal pattern: Replace Main B/D
Check the power cord Power B/D → Module
voltage - Defective pattern: Replace Module
connection
Check if the power strip is working properly N
Defective Main B/D or Power B/D ☞ How to check
Y How to check Main SoC LED TV_T-Conless
Normal Check the sound
Internalize T-Con → Main B/D
☞ How to measure voltage(1/4) Y voltage (Mute key 3 times) How to check
Y Normal - Measure the voltages of 5 points on
Properly connected Measure the output voltage of N
Power B/D ST-By voltage Defective Power B/D T-Con B/D
Spec : 7.8V
N Y Check Main B/D
N Beeping sound & Criteria
Defective Power B/D Module - Normal voltage: Replace Module
☞ How to measure voltage(3/4) - Defective voltage: Replace Main B/D
N
Measure the output voltage of
Defective SoC
LED TV_T-Con Distribution completed
PWR_On
Check the supply voltage of Main B/D → Power B/D How to check
- Measure the voltages of 5 points
on T-Con B/D
Normal Y Defective Power B/D
voltage Criteria
Spec : 3V or higher - Normal voltage: Replace Main B/D
Defective Main B/D N - Defective voltage: Replace Module
Re-connect and [For all models]
Replace Power B/D Replace Main B/D Replace Power B/D Replace Main B/D If the result comes out ‘NG’ for each part, make sure to check the connector
check again between the part and the cable is properly connected.
(Check if the cable connection is normal)
1/1
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Note 1. How to measure ST-by
1. Measure the 12VM of Power B/D and Main B/D connector
The ST-by voltage for each model may be different, so refer to the Appendix A9 page in Service Manual.
2. When measuring 12VM, it is considered normal if ST-by is7.8V and Normal is 12. (Some models launched before 2017 may have 5V / 3.5V)
3. If the result comes out ’NG’, replace Power Board
●
Note. 1 / 4
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Note 2. How to measure the output voltage of Power B/D
1. Check the output voltage of Power B/D and Main B/D connector
2. Check the output voltage of 20VS and 12VM
3. If the result comes out ’NG, check the voltage of PWR_ON
●
Note. 2 / 4
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Note 3. How to measure PWR On
1. Check the PWR_ON voltage of Power B/D and Main B/D connector
2. The normal power supply voltage from Main B/D to Power B/D is 3V or higher
3. If the result comes out ’NG, replace Main Board. If it comes out ‘OK’, replace Power B/D
4. The normal power supply from MAIN to POWER is 3V or higher
●
PWR_ON
Note. 3 / 4
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Note 4. How to measure Power B/D Module
1. Check the 21.5V and 12V voltage of Power B/D and T-Con B/D connector
2. If the result comes out ’NG, replace Power B/D. If it comes out ‘OK’, check if Main B/D and Module operate normally.
Note. 4 / 4
Copyright © 2023 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix. How to check for OLED TV module defects OLED TV
1. Disassemble the back cover to disconnect the Main B/D Series Size Model Name V17 V18 V19 V20 V21 V22 V23
48 OLED48A* O O O
2. Check if the test pattern is working on the screen 55 OLED55A* O O O
A
65 OLED65A* O O O
3. If the pattern appears, it means the Main B/D is defective (need to replace it) 77 OLED77A* O O O
55 OLED55B* O O O O O O O
4. If the pattern doesn’t appear, (keep showing no screen), B 65 OLED65B* O O O O O O O
77 OLED77B* O O O O O
it means the Module is defective(need to replace it) 42 OLED42C* O O
48 OLED48C* O O O O
55 OLED55C* O O O O O O O
C
65 OLED65C* O O O O O O O
[Models launched before 2025] 77
83
OLED77C*
OLED83C*
O O O O
O
O
O
O
O
55 OLED55E* O O O
E
65 OLED65E* O O O
55 OLED55G* O O O O
65 OLED65G* O O O O O O O
G 77 OLED77G* O O O O O O
83 OLED83G* O O
97 OLED97G* O
65 OLED65W* O O O
W
77 OLED77W* O O O
R.G.B pattern operation
[Connecting the power cable, T-Con FFC cable to the Jig]
Connect the powerboard-mainboard cable with
the powerboard-JIG
Power B/D T-Con // Main B/D
Connect the T-Con ~ motherboard
FFC cable to the Jig
JIG
Parts connecting Cable A jig for sending test patterns ※ SVC Part P/No : RAD33749101
Appendix. 1 / 1
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Only for training and service purposes.
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