OLED TV
SERVICE MANUAL
CHASSIS : E*22A
MODEL : OLED55A2***
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71888202 (2203-REV01)
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 © 2022 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
ASSEMBLY / DISASSEMBLY GUIDE..................................................... 16
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
This specification is applied to the LED TV used E*22A chassis.
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.
3. Test method
(1) Performance: LGE TV test method followed
(2) Demanded other specification
- Safety : CE, IEC specification
- EMC : CE, IEC specification
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
1) Only DVB-T2/C/S2 support model only.
1) PAL-DK:VHF/UHF 1~62, Cable:1~41
3 Program coverage
2) PAL-I: VHF/UHF 1~69, Cable:1~47
2)3)4) China/Hongkong/Philippine separate marking
3) NTSC M: VHF/UHF 2~78, Cable:1~71
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 / Japan / Mexico
No. Item Specification Remarks
Korea / North America / Central and South
1 Market
America / 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
Analog : NTSC / PAL-M / PAL-N
2 Broadcasting system
Digital : ATSC, 64 & 256 QAM
Mexico
Analog : NTSC-M
Digital : DVB-T
Taiwan
Analog : NTSC-M
ISDB-T / ISDB-S/S3(BS/CS) Japan
VHF 2 ~ 13
UHF 14 ~ 69
DTV 2 ~ 69 North America / Mexico
CATV 1 ~ 135
CADTV 1 ~ 135
VHF 2 ~ 13
UHF 14 ~ 69
Cenrtal and South America
DTV 2 ~ 69
CATV 1 ~ 135
VHF 2 ~ 13
3 Available Channel
UHF 14 ~ 69
Colombia / Panama / Taiwan
DTV 2 ~ 69
CATV 1 ~ 125
VHF 1~12
UHF 13~62
Japan
CATV C13~C63
BS Digital 000~999
CS Digital 000~999 *BS8K is only for 8K Models.
(4K Models do not support BS8K Digital Channels.)
BS4K/8K Digital 001~499
CS4K Digital 500~999
-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
QPSK/16-QAM/64-QAM
- Code Rate
4 Receiving system
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
Terrestrial : BST-OFDM
For Japan model
Satellite BS/CS : 16APSK, 8PSK, QPSK, BPSK
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 *Only 42/48C2 model & Japan all model
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 Format
5.1. HDMI
(1) DTV mode
No. Resolution H-freq(kHz) V-freq(kHz) Pixel clock(MHz) Proposed Remarks
1 640*480 31.46 59.94 25.12 SDTV 480P
2 640*480 31.5 60 25.12 SDTV 480P
3 720*480 31.47 59.94 27 SDTV 480P
4 720*480 31.5 60 27.02 SDTV 480P
5 720*576 31.25 50 27 SDTV 576P
6 1280*720 44.96 59.94 74.17 HDTV 720P
7 1280*720 45 60 74.25 HDTV 720P
8 1280*720 37.5 50 74.25 HDTV 720P
9 1920*1080 28.12 50 74.25 HDTV 1080I
10 1920*1080 33.72 59.94 74.17 HDTV 1080I
11 1920*1080 33.75 60 74.25 HDTV 1080I
12 1920*1080 26.97 23.97 63.29 HDTV 1080P
13 1920*1080 27 24 63.36 HDTV 1080P
14 1920*1080 33.71 29.97 79.12 HDTV 1080P
15 1920*1080 33.75 30 79.2 HDTV 1080P
16 1920*1080 56.25 50 148.5 HDTV 1080P
17 1920*1080 67.43 59.94 148.35 HDTV 1080P
18 1920*1080 67.5 60 148.5 HDTV 1080P
19 1920*1080 112.5 100 297 UDTV 2160P
20 1920*1080 134.86 119.88 296.7 UDTV 2160P
21 1920*1080 135 120 297 UDTV 2160P
22 3840*2160 53.95 23.98 296.7 UDTV 2160P
23 3840*2160 54 24 297 UDTV 2160P
24 3840*2160 56.25 25 297 UDTV 2160P Not Support for FHD.
25 3840*2160 61.43 29.97 296.7 UDTV 2160P
26 3840*2160 67.5 30 297 UDTV 2160P
27 3840*2160 112.5 50 594 UDTV 2160P
28 3840*2160 134.86 59.94 593.4 UDTV 2160P
29 3840*2160 135 60 594 UDTV 2160P
30 3840*2160 225 100 1188 UDTV 2160P
4K120 model (LM21U HDMI,
31 3840*2160 269.73 119.88 1186.8 UDTV 2160P
O20N) or 8K model
32 3840*2160 270 120 1188 UDTV 2160P
33 4096*2160 53.95 23.98 296.7 UDTV 2160P
34 4096*2160 54 24 297 UDTV 2160P
35 4096*2160 56.25 25 297 UDTV 2160P
36 4096*2160 61.43 29.97 296.7 UDTV 2160P
Not Support for FHD.
37 4096*2160 67.5 30 297 UDTV 2160P
38 4096*2160 112.5 50 594 UDTV 2160P
39 4096*2160 134.86 59.94 593.4 UDTV 2160P
40 4096*2160 135 60 594 UDTV 2160P
41 4096*2160 225 100 1188 UDTV 2160P
4K120 model (LM21U HDMI,
42 4096*2160 269.73 119.88 1186.8 UDTV 2160P
O20N) or 8K model
43 4096*2160 270 120 1188 UDTV 2160P
44 7680*4320 107.89 23.98 1188 8K
45 7680*4320 108 24 1188 8K
46 7680*4320 110 25 1188 8K
47 7680*4320 131.87 29.97 1188 8K
8K Model Only.
48 7680*4320 132 30 1188 8K
49 7680*4320 220 50 2376 8K
50 7680*4320 263.74 59.94 2376 8K
51 7680*4320 264 60 2376 8K
- 10 - 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(Reduced
9 1920*1080 67.5 60 158.4
Blanking)
10 1920*1080 134.86 119.88 296.7 UDTV 2160P
11 1920*1080 135 120 297 UDTV 2160P
12 3840*2160 53.95 23.98 296.7 UDTV 2160P
13 3840*2160 54 24 297 UDTV 2160P
14 3840*2160 56.25 25 297 UDTV 2160P
15 3840*2160 61.43 29.97 296.7 UDTV 2160P
16 3840*2160 67.5 30 297 UDTV 2160P
17 3840*2160 112.5 50 594 UDTV 2160P
18 3840*2160 134.86 59.94 593.4 UDTV 2160P
Not Support for FHD.
19 3840*2160 135 60 594 UDTV 2160P
20 4096*2160 53.95 23.98 296.7 UDTV 2160P
21 4096*2160 54 24 297 UDTV 2160P
22 4096*2160 56.25 25 297 UDTV 2160P
23 4096*2160 61.43 29.97 296.7 UDTV 2160P
24 4096*2160 67.5 30 297 UDTV 2160P
25 4096*2160 112.5 50 594 UDTV 2160P
26 4096*2160 134.86 59.94 593.4 UDTV 2160P
27 4096*2160 135 60 594 UDTV 2160P
(UHD 60Hz models only), Sup-
28 2560*1440 88.78 59.95 241.5 3K port only when UHD DeepColor
is On
(UHD, 8K 120Hz models only),
29 2560*1440 182.99 119.99 497.7 3K Support only when UHD Deep-
Color is On
- 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.
1.2V_DDR 2.5V 1.2V_Vterm
0.95V 1.0V
1.8V
13V 0.95V 13V 1.0V 3.5V_ST 1.2V 3.5V_ST 2.5V 3.3V 1.2V 3.3V
DDR4_ 1.8V_IO
Core CPU DDR VPP Vterm X_TAL
27MHz
3.5V_ST 3.3V 5V 0.95V 1.0V 3.3V 1.8V 3.5V_ST
5V
13V 3.5V 13V 3.3V 13V 5V 2.5V P_TS_IN
ST_BY Normal Normal
DDR4 2666 64bit (16bit x 4) P_TS_OUT CI Slot
1.2V_DDR (512MB X 4EA)
20V 13V
1.2V_Demod
(Full NIM ONLY) 3.5V_ST
3.3V
1.2V I2C_5 NVRAM (256Kb)
DEMOD
MICOM eMMC 3.3V
eMMC (8GB)
CLK/DATA/STRB
5V
1.8V
Vx1 OCP USB1 (2.0)
Vx1 41P/51P Main SoC
OCP USB2 (2.0)
I2C_3
20V 3.3V From
PHY_0_2.0 HDMI1 (2.0)
To Power
- 14 -
I2S Out PHY_1_2.0 HDMI2 (2.0)
Panel MAIN Audio AMP B/D
I2C_0 PHY_2_2.1 HDMI3 (2.1, eARC)
IR/KEY/MIC PHY_3_2.1
IF IF (+/-)
IF_S IQ (+/-), IP(+/-) 1.2V_Demod
3.3V
(Full NIM ONLY)
TS
BLOCK DIAGRAM
Copyright ©
TUNER TUNER
SPDIF OUT
Signal Flow
USB_WIFI
ETHERNET
CVBS/ AUDIO L/R
I2C_1/2
(S,S2) (T2/C/A)
Supply Power
3.5V_ST
In/ out Power
LNB 13V
3.5V_ST
AMP
T2/C/S/S2 H-NIM tuner
Air/
IC,Tx/Rx
DVB-S
Cable
IR / KEY / MIC
LAN
Only training and service purposes.
Area OPT Area OPT
(Depend on region) (Depend on region)
AV
SPDIF
H/P
RS-232
To WIFI/ BT
Sub Assy Combo
Area OPT(Depend 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.
Do not modify the original design without permission of manufacturer.
700
Stand Screw
A10
900
400
AR2
570
LV2
LV1
HW1
810
540
500
HS1
501
800
HP1
830
HR2
120
200T
200
530
HR1
810
- 15 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
ASSEMBLY / DISASSEMBLY GUIDE
[SCREW guide]
Back Cover / Module Cover SCREW 3 types applied.
● Back Cover SCREW 1 type
FAB31843211
● Module Cover SCREW 2 types
FAB34988502
FAB32418704
- 16 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
[Disassembly Guide]
Total Screw No.
(1) FAB31843211 : 5 EA
(2) FAB32418704 : 21 EA
(3) FAB34988502 : 6 EA
1. After removing 1 screws, Separate Power Cord Bracket from Back cover and Detach
the Power Cord from the Power PCB Wafer.
1
2
Screw (FAB31843211) : 1ea
2. After removing 4 screws, Separate Cover, Rear from Module cover.
Screw (FAB31843211) : 4ea
* Separate from the IR boundary.
(Back Cover Only)
- 17 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
* Additional Guide
(1) When you press the Back Cover ( ), A Gap is createdat the boundary of the IR Assy-Back Cover.
(2) Put your hand through the gap and separate the back cover.
- 18 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
3. Remove all sort of Cables and Detach the Wiring tapes().
4. Disassemble the bracket after removing 1 screw of Wifi Assy. Remove 1 screw and
separate the IR Assy from the Back Cover.
1
1
Screw (FAB32418704) : 2ea
- 19 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
5. Remove the Speakers.
6. After Removing 10 Screws of the Power Board and Main Board, Disassemble those
Boards from the Module Cover.
Screw (FAB32418704) : 10ea
- 20 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
7. Removing 10 Screws VESA, Stand Supporter, IR Supporter.
Screw (FAB32418704-④) : 4ea
Screw (FAB34988502-⑤) : 6ea
8. Removing 4 Cables and 5 Screws, Separate the T-con Board from Module.
1
1 1
1 1
Screw (FAB32418704) : 5ea
- 21 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
[Assembly Guide]
Proceed in the reverse order of the disassembly guide, and it is necessary to check the
following Check List
※ Assembly Check List
- Check the screw quantity and part number
(1) FAB31843211 : 5 EA
(2) FAB32418704 : 21 EA
(3) FAB34988502 : 6 EA
- Check the IR Assy FFC Cable connection
[FFC Disassemble Method] [FFC Assemble Method]
Cover Close Direction
Cover Open Direction
[Bad Connection]
☆ KEY POINT ☆
Check the connector pin insertion
Check the cable locking
[Locking NG] [INSERT NG]
Check the Latch
[OK]
- 22 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
※ Assembly Check List
After inserting by pressing the Back Cover Latch, check the gap between the Module Cover and the
Back Cover.
Check the gap Module to B/C after assembly
Push the LATCH
- 23 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
TROUBLE SHOOTING GUIDE
Copyright © 2022 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 A. Video error Picture broken/ Freezing 3
4 Color error 4
Vertical/Horizontal bar, residual image, light
5 5
spot, external device color error
6 No power 6
B. Power error Off when on, off while viewing, power auto
7 7-8
on/off
8 No audio/Normal video 9
C. Audio error
9 Wrecked audio/discontinuation/noise 10
10 Remote control & Local switch checking 11
11 MR22 operating checking 12
D. Function error
12 Wifi operating checking 13
13 External device recognition error 14
14 E. Noise Circuit noise, mechanical noise 15
15 F. Exterior error Exterior defect 16
First of all, Check whether there is SVC Bulletin in GSCS System for these model.
Copyright © 2022 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 1/16
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, Vx1 Cable, Speaker Cable, IR B/D Cable,,,)
☞A1 ☞A9
Y Check Power Y
No video Normal Check Vx1 lock Y Normal
0V Board (Main) Replace Main Board
Normal audio audio voltage voltage
20V, 12V etc.
N ☞A9 N N
Move to No Check Power Board Repair Power
video/No audio (Module) 23V output Board or parts
Y
Normal Replace module
voltage
End
N
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 © 2022 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 2/16
☞A9
Check various voltages Y Check and
No Video/ Normal
of Power Board (Main) replace
No audio voltage?
(20V, 12V…) MAIN B/D
N End
Replace Power
Board and repair
parts
2
Copyright © 2022 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 3/16
. By using Digital signal level meter
☞ A3
. By using Diagnostics menu on OSD
Check RF Signal level ( All Settings→ Channels → Channel Tuning → Manual Tuning → Check the Signal )
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
Y Check whether other equipments have problem or not.
Normal
(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
N Contact with signal distributor
Normal
Picture? or broadcaster (Cable or Air)
Normal N
Y Picture? Replace
Main B/D
Y
Close
Close
3
Copyright © 2022 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 4/16
☞ A7
☞A6
※ Check and
Check color by input replace Link
Y Y Y
-External Input Color Cable Color Color
Replace Main B/D Replace module
-AV error? (V by one) error? error?
-HDMI and contact
N condition N N
End
Check error color
input mode
External Check external External Y
Input device and device/Cable Replace Main B/D
error cable normal
N
Request repair
for external
device/cable
N
Check external External Y
HDMI
device and device/Cable Replace Main B/D
error
cable normal
4
Copyright © 2022 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 5/16
Vertical/Horizontal bar, residual image, light spot Replace
Module
☞A6 ☞ A7 N
Check external
Check color condition by input Y Check and
Screen Y device Screen N Screen
-External Input Normal? replace Link Replace Main
normal? connection normal? normal?
-HDMI Cable
condition
N Y Y
N
Replace Request repair End End
module for external
device
External device screen error-Color error
Connect other external
Check screen
condition by input External
device and cable Replace
Check S/W Check N N
(Check normal operation of Screen
-External Input Input Main B/D /
Version version External Input, HDMI/DVI normal?
-AV error Module
-HDMI/DVI by connecting Jig, pattern
Generator ,Set-top Box etc. Y
Y
Request repair for
S/W Upgrade external device
Connect other external Y
device and cable
Normal N (Check normal operation of N Replace
HDMI/ Screen
screen? External Input, Component, Main B/D /
DVI normal?
RGB and HDMI/DVI by Module
Y connecting Jig, pattern
Generator ,Set-top Box etc.
End
5
Copyright © 2022 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 6/16
☞A8 ☞A9
Y DC Power on N Y
Check Power Normal Check Power Replace
by pressing Power Key OK?
Logo 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 Y
Normal
Replace Main B/D
voltage?
Close Normal
Check ST-BY (7.8V)
voltage? N
☞A9 Replace Power B/D
N
Replace Power
B/D
6
Copyright © 2022 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 7/16
Check outlet
☞A10
N Y
Check A/C cord Error? Check Power Off CPU
Replace Main B/D Normal? End
Mode Abnormal
N
Check for all 2- phase
power out Y Abnormal Replace Power B/D
1
Fix A/C cord & Outlet
and check each 2 ☞A9
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
7
Copyright © 2022 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 8/16
* 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.
NO POLING RESULT : TV power off/on (Reboot) 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
Power off by module error (OLED)
INV_ERROR Check & Change OLED Module
CONDITION : OLED Module send signal to micom
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
Normal Case
AUTO OFF Power off by auto off function
RESREC Power off by reserved recording
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)
8
Copyright © 2022 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 9/16
☞A11 ☞A12+A9
Check user N Check audio B+ Y
No audio Normal
menu > Off 20V of Power
Screen normal voltage
Speaker off Board
Y N
Cancel OFF Replace Power Board and repair parts
Check Speaker N
Disconnection Replace MAIN Board End
disconnection
Y
connecting Speaker
9
Copyright © 2022 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 10/16
→ 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 Y
Signal
-RF
normal? Wrecked audio/
-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 © 2022 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 11/16
1. Remote control(R/C) operating error Replace
Main B/D
☞A13 ☞A13 ☞A13
Check & Repair N Check B+ Y Y
Check R/C itself Normal Y Normal Normal Check IR Normal
operating? Cable connection operating? 3.5V Voltage? Signal?
Operation Output signal
Connector solder On Main B/D
N Y N N
☞A9
Check R/C Operating Check & Replace Close Check 7.8V on Power B/D Repair/Replace
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)
Y
If R/C operate, Normal
Close
Explain the customer operating?
cause is interference
from light in room. N
Replace R/C
11
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process
Established
Error D. Function error date
symptom
MR22 operating checking Revised date 12/16
2. MR22 (Magic Remote control) operating error
☞A4
Check the N Check MR22
RF Receiver ver Normal Y Press the Is show ok N Turn off/on the
INSTART menu is “00.00”? itself Operation operating? message? set and press
wheel
the wheel
N Y
Y
☞A14
Check & Replace
Check & Repair Battery of MR22 Close
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
MR22
Y Close
Down load the Firmware
* INSTART MENU •If you conduct the loop at 3times,
12.RF Remote control Test change the MR22.
Receiver Firmware download
12
Copyright © 2022 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 13/16
3.Wifi operating error
☞A4 ☞A14
Check the Wi-Fi Mac value N Check the Wifi wafer Normal N Replace
INSTART menu is “NG”? 1pin Voltage? Main B/D
Y
☞A14 Y
Close
Check & Repair
Wifi cable
connection
☞A4
Wi-Fi Mac value N
is “NG”? Close
Y
Change the Wifi
assy
13
Copyright © 2022 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 14/16
Check technical
Check Y N
Signal information Technical External Input
input 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
14
Copyright © 2022 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 15/16
Identify
Circuit Check location
nose Replace PSU
noise of noise
type
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.
※ Describe the basis of the description in ※ If there is a “Tak Tak” noise from the
“Part related to nose” in the Owner’s cabinet, refer to the KMS fix information and
Manual. then proceed as shown in the solution manual
(For models without any fix information,
provide the description)
15
Copyright © 2022 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 16/16
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 © 2022 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 Check Vx1 lock 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) reconnection
7 A. Video error_ Color error A7
condition
Exchange Main Board (1) A-1/5
Exchange Main Board (2) A-2/5
8 Defected Type caused by T-Con/ Power Exchange Power Board (PSU) A-3/5
/ Module
Exchange Module (1) A-4/5
Exchange Module (2) A-5/5
Copyright © 2022 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
9 Check front display LED A8
B. Power error_ No power
10 Check power input Voltage & ST-BY 3.5V A9
B. Power error_Off when on, off
11 POWER OFF MODE checking method A10
while viewing
Checking method in menu when there is no
12 A11
audio
C. Audio error_ No audio/Normal video
Voltage and speaker checking method when
13 A12
there is no audio
14 Remote control operation checking method A13
15 D. Function error Motion Remote operation checking method A14
16 Wifi operation checking method A14
17 How to use the Service remote control A15-A17
E. Etc
18 Check items after Main B/D replacement A18
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Established
Error symptom A. Video error_No video/Normal audio date
Content Check Vx1 lock Revised A1
date
- Check a voltage of R7624(Red) after turn on the TV. * Refer : Burnt Detect Check Point In the state of TV
If the voltage is low, Vx1 is locked.(OK) on, Check the voltage of R7632 (Blue).
- Low (0V) : Normal, High (3.3V) : Burnt Detect
A1
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Established
Error symptom A. Video error_No video/Normal audio date
Content Revised A2
Check White Balance value
date
Entry method
1. Press the ADJ button on the remote control for adjustment.
2. Enter into White Balance of item 12.
3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm),
re-enter the value after replacing the MAIN BOARD.
A2
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Established
Error symptom A. Video error_Video error, video lag/stop date
Content TUNER input signal strength checking method Revised A3
date
All Settings Programmes Programme Tuning & setting
Manual Tuning Antenna DTV
When the signal is strong, use the
attenuator (-10dB, -15dB, -20dB etc.)
A3
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Established
Error symptom A. Video error_Video error, video lag/stop date
Content OLED TV Version checking method Revised A4
date
Version
Press the IN-START with the remote
control for adjustment
A4
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Established
Error symptom A. Video error_Video error, video lag/stop date
Content Tuner Checking Part Revised 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 © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom
A. Video error _Vertical/Horizontal bar, Established
residual image, light spot date
Revised
Content OLED TV Connection diagram A6
date
As the part connecting to the external input, check the
screen condition by signal
A6
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Established
Error symptom A. Video error_Color error date
Content Check Link Cable (Vx1) reconnection condition Revised A7
date
Check the contact condition of the Link Cable, especially dust or mis insertion.
A7
Copyright © 2022 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 - 1/10
Copyright © 2022 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 - 2/10
Copyright © 2022 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 - 3/10
Copyright © 2022 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 - 4/10
Copyright © 2022 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 - 5/10
Copyright © 2022 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
Un-repairable Cases
Module Vertical bar
In this case please exchange the module
Module image broken Source Driver issue
Module White dot White dot cause by panel issue
Module Line Dim Vertical Line cause by source drive IC
A - 6/10
Copyright © 2022 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 Burnt Module burnt
Module Horizon line Module has damaged
Module has damaged
Module Line Defect
Un-repairable Cases
Module Press damage
In this case please exchange the module
A - 7/10
Copyright © 2022 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 Vertical Bar cause by source drive IC
Vertical Noise Un-repairable Cases
Module Brightness
In this case please exchange the module
difference
Module Green light Compensation error when Power On/off
Color difference between screen cause
Module Color difference by compensation error
A - 8/10
Copyright © 2022 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 has damaged
Module No image
(Can’t fix it)
Burnt
Module Burnt
(Can’t fix it)
Screen Mura
Module Mura
(Can’t fix it)
A - 9/10
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix : Exchange Power Board (PSU)
No Light No picture/Sound Ok
A – 10/10
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Established
Error symptom B. Power error _No power date
Revised A8
Content Check front Power Indicator
date
LED
ST-BY condition : On or Off
Power ON condition : Turn Off
A8
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Established
Error symptom B. Power error _No power date
Check power input voltage and ST-BY 3.5V Revised A9
Content
date
Check the DC 12VT line for ST-BY Voltage Power To Main B’d
55/65A2 (ST-BY : 7.8V, Normal : 12V)
P201
P252
P251
Power To Module
A9
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Established
Error symptom B. Power error_Off (when on, whiling viewing) date
Revised A10
Content POWER OFF MODE checking method
date
Entry method
1. Press the IN-START button of the remote control for adjustment.
2. Check the entry into adjustment item 3 (Power On/Off Status).
A10
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Established
Error symptom C. Audio error_No audio/Normal video date
Revised A11
Content Checking method in menu when there is no audio
date
Checking method
1. Press the Setting button on the remote control.
2. Select the Sound function of the Menu.
3. Select the Sound Out.
4. Select TV Speaker.
A11
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Established
Error symptom C. Audio error_No audio/Normal video date
Voltage and speaker checking method Revised A12
Content
when there is no audio date
P201
② ①
1 SPK_R-_FT 2 SPK_R+_FT
3 SPK_L-_FT 4 SPK_L+_FT
Checking order when there is no audio
① Check the contact condition of or 20V connector of Main Board.
② Measure the 20V input voltage supplied from Power Board.
(If there is no input voltage, remove and check the connector.)
③ Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound
when you touch the GND and output terminal, the speaker is normal.
A12
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom D. Function error Established
date
Revised A13
Content Remote control operation checking method
date
48/55/65/77A2
① IR & EYE Sensor Pin Pin name
1 3.5V_WIFI
2 WIFI_DM
3 WIFI_DP
4 GND
5 WOL/WIFI_POWER_ON
6 3.5V_WIFI
7 WIFI_SUSPEND/RESUME
8 GND
9 COMBO_RESET
10 BT_WAKEUP_HOST
11 GND
12 3.5V_WIFI
13 N/C
IR LED Eye 14 N/C
15 N/C
16 EYE_SDA
17 EYE_SCL
18 GND
② 19 IR
20 LED_R
③ 21 GND
22 +3.5V_ST
Checking order to check remote control 23 KEY2
24 WOV_PDM0_DATAIN
1. Check IR cable condition between IR & Main board.( Check picture number① and ②). 25 WOV_PDM_CLKOUT
2. Check the Pin 22, Standby Power 3.5V (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 © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom D. Function error Established
date
Revised A14
Content Motion Remote operation checking method
date
① Wifi & BT Front Pin Pin name
1 3.5V_WIFI
2 WIFI_DM
3 WIFI_DP
4 GND
5 WOL/WIFI_POWER_ON
③
6 3.5V_WIFI
7 WIFI_SUSPEND/RESUME
8 GND
9 COMBO_RESET
10 BT_WAKEUP_HOST
11 GND
Wifi & BT Rear
12 3.5V_WIFI
13 N/C
14 N/C
15 N/C
16 EYE_SDA
17 EYE_SCL
18 GND
② 19 IR
20 LED_R
21 GND
22 +3.5V_ST
23 KEY2
24 WOV_PDM0_DATAIN
Checking order 25 WOV_PDM_CLKOUT
1. Check BT/Wifi cable condition between BT/Wifi assy & Main board.
2. Terminal Pin 1, Pin 6, Pin12, Check 3.5V Power. (No. ③)
A14
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom Established
E. Etc date
Revised A15
Content How to use the Service remote control
date
How to access the remote control
0 4 1 3
0 4 1 3
A15
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom Established
E. Etc date
Revised A16
Content How to use the Service remote control
date
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
P-ONLY (Added Changed to factory mode
Function) All KEY function &[INFO][STILL][HDMI HOT][USB HOT][HDMI4] KEY Action
INPUT Change to the external device mode
Change in the order of 16:9=>Zoom1=>Zoom2=>Cinema Zoom=>Aucto
ARC
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 © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom Established
E. Etc date
Revised A17
Content How to use the Service remote control
date
Explaining the button name of the Remote control
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
HDD,USB, external device’s HDD screen is activated
function)
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
Connects to Component 1,2
function)
HDMI1,2,3,4
Connects to HDMI 1,2,3,4
(Add function)
DVI (Add function) Connects to DVI
A17
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error symptom Established
E. Etc date
Revised A23
A24
A18
Content How to use the Service remote control
date
Check items afer Main B/D (Model Number D/L, White Balance)
1. Press the Service remote control In-Start 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.
A14
A18
Copyright © 2022 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
