LG TV OLED48C1PUB Oled Owner’s Manual

TV OLED48C1PUB Oled

OLED TV SERVICE MANUAL
CHASSIS : EA11C
MODEL: OLED48C1PUB MODEL: OLED48C1AUB
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71819001 (2103-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 © 2021 LG Electronics Inc. All rights reserved. Only training and service purposes.

CONTENTS
CONTENTS …………………………………………………………………………………. 2 SAFETY PRECAUTIONS ……………………………………………………………… 3 SERVICING PRECAUTIONS …………………………………………………………. 4 SPECIFICATION ………………………………………………………………………….. 6 SOFTWARE UPDATE …………………………………………………………………. 10 BLOCK DIAGRAM ……………………………………………………………………… 12 EXPLODED VIEW ………………………………………………………………………. 13 ASSEMBLY / DISASSEMBLY GUIDE ……………………………………………. 14 TROUBLE SHOOTING GUIDE ………………………………………… APPENDIX

– 2 –

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
An isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks.
It will also protect the receiver and it’s components from being damaged by accidental shorts of the circuitry that may be inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1 W), keep the resistor 10 mm away from PCB.
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 M and 5.2 M. 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.

Leakage Current Hot Check (See below Figure) Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check. Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor between a known good earth ground (Water Pipe, Conduit, etc.) and the exposed metallic parts. Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more sensitivity. Reverse plug the AC cord into the AC outlet and repeat AC voltage measurements for each exposed metallic part. Any voltage measured must not exceed 0.75 volt RMS which is corresponds to 0.5 mA. In case any measurement is out of the limits specified, there is possibility of shock hazard and the set must be checked and repaired before it is returned to the customer.
Leakage Current Hot Check circuit

– 3 –

Only training and service purposes.

SERVICING PRECAUTIONS

CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the SAFETY PRECAUTIONS on page 3 of this publication. NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 3 of this publication, always follow the safety precautions. Remember: Safety First.
General Servicing Precautions 1. Always unplug the receiver AC power cord from the AC power
source before; a. Removing or reinstalling any component, circuit board
module or any other receiver assembly. b. Disconnecting or reconnecting any receiver electrical plug
or other electrical connection. c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver. CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. 2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltage measuring device (DVM, FETVOM, etc) equipped with a suitable high voltage probe. Do not test high voltage by “drawing an arc”. 3. Do not spray chemicals on or near this receiver or any of its assemblies. 4. Unless specified otherwise in this service manual, clean electrical contacts only by applying the following mixture to the contacts with a pipe cleaner, cotton-tipped stick or comparable non-abrasive applicator; 10 % (by volume) Acetone and 90 % (by volume) isopropyl alcohol (90 % – 99 % strength) CAUTION: This is a flammable mixture. Unless specified otherwise in this service manual, lubrication of contacts in not required. 5. Do not defeat any plug/socket B+ voltage interlocks with which receivers covered by this service manual might be equipped. 6. Do not apply AC power to this instrument and/or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed. 7. Always connect the test receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead. Always remove the test receiver ground lead last. 8. Use with this receiver only the test fixtures specified in this service manual. CAUTION: Do not connect the test fixture ground strap to any heat sink in this receiver.
Electrostatically Sensitive (ES) Devices Some semiconductor (solid-state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage caused by static by static electricity. 1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static type solder removal device. Some solder removal devices not classified as “anti-static” can generate electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material).
7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.)
General Soldering Guidelines 1. Use a grounded-tip, low-wattage soldering iron and appropri-
ate tip size and shape that will maintain tip temperature within the range or 500 °F to 600 °F. 2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead. 3. Keep the soldering iron tip clean and well tinned. 4. Thoroughly clean the surfaces to be soldered. Use a mall wirebristle (0.5 inch, or 1.25 cm) brush with a metal handle. Do not use freon-propelled spray-on cleaners. 5. Use the following unsoldering technique a. Allow the soldering iron tip to reach normal temperature.
(500 °F to 600 °F) b. Heat the component lead until the solder melts. c. Quickly draw the melted solder with an anti-static, suction-
type solder removal device or with solder braid. CAUTION: Work quickly to avoid overheating the circuit board printed foil. 6. Use the following soldering technique. a. Allow the soldering iron tip to reach a normal temperature (500 °F to 600 °F) b. First, hold the soldering iron tip and solder the strand against the component lead until the solder melts. c. Quickly move the soldering iron tip to the junction of the component lead and the printed circuit foil, and hold it there only until the solder flows onto and around both the component lead and the foil. CAUTION: Work quickly to avoid overheating the circuit board printed foil. d. Closely inspect the solder area and remove any excess or splashed solder with a small wire-bristle brush.

– 4 –

Only training and service purposes.

IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 and 6 above.
Removal 1. Desolder and straighten each IC lead in one operation by
gently prying up on the lead with the soldering iron tip as the solder melts. 2. Draw away the melted solder with an anti-static suction-type solder removal device (or with solder braid) before removing the IC. Replacement 1. Carefully insert the replacement IC in the circuit board. 2. Carefully bend each IC lead against the circuit foil pad and solder it. 3. Clean the soldered areas with a small wire-bristle brush. (It is not necessary to reapply acrylic coating to the areas).
“Small-Signal” Discrete Transistor Removal/Replacement 1. Remove the defective transistor by clipping its leads as close
as possible to the component body. 2. Bend into a “U” shape the end of each of three leads remain-
ing on the circuit board. 3. Bend into a “U” shape the replacement transistor leads. 4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the “U” with long nose pliers to insure metal to metal contact then solder each connection.
Power Output, Transistor Device Removal/Replacement 1. Heat and remove all solder from around the transistor leads. 2. Remove the h t sink mounting screw (if so equipped). 3. Carefully remove the transistor from the heat sink of the circuit
board. 4. Insert new transistor in the circuit board. 5. Solder each transistor lead, and clip off excess lead. 6. Replace heat sink.
Diode Removal/Replacement 1. Remove defective diode by clipping its leads as close as pos-
sible to diode body. 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.

3. Solder the connections. CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures.
Circuit Board Foil Repair Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or “lift-off” the board. The following guidelines and procedures should be followed whenever this condition is encountered.
At IC Connections To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board. (Use this technique only on IC connections).
1. Carefully remove the damaged copper pattern with a sharp knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if used) from the end of the remaining copper pattern.
3. Bend a small “U” in one end of a small gauge jumper wire and carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper pattern and let it overlap the previously scraped end of the good copper pattern. Solder the overlapped area and clip off any excess jumper wire.
At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins. This technique involves the installation of a jumper wire on the component side of the circuit board.
1. Remove the defective copper pattern with a sharp knife. Remove at least 1/4 inch of copper, to ensure that a hazardous condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern break and locate the nearest component that is directly connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the nearest component on one side of the pattern break to the lead of the nearest component on the other side. Carefully crimp and solder the connections. CAUTION: Be sure the insulated jumper wire is dressed so the it does not touch components or sharp edges.

– 5 –

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 OLED TV used EA11C chassis.
2. Test condition
Each part is tested as below without special appointment. (1) Temperature : 25 ºC ± 5 ºC(77 ± 9 ºF) , CST : 40 ºC ± 5 ºC (2) Relative Humidity: 65 % ± 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 5 minutes prior to the adjustment.

3. Test method
(1) Performance: LGE TV test method followed (2) Demanded other specification
– Safety : UL, CSA, CE, IEC specification – EMC : FCC, ICES, CE, IEC specification

4. General Specification

Item

1 Market

2 Broadcasting system

3 Available Channel

4 Receiving system 5 Video Input 6 HDMI Input
7 Audio Input

HDMI 1 HDMI 2 HDMI 3 HDMI 4

Specification North America ATSC / NTSC-M, 64 & 256 QAM VHF : 02~13 UHF : 14~69 DTV : 02-69 CATV : 01~135 CADTV : 01~135 Digital : ATSC, 64 & 256 QAM Analog : NTSC-M NTSC-M PC / DTV format PC / DTV format PC / DTV format PC / DTV format AV Audio / DVI Audio

8 Audio out

SPDIF(1EA)

HeadPhone(1EA)

9 USB Input(3EA)

10 Ethernet Connect (1EA)

Optical Audio out HeadPhone out EMF, DivX HD, For SVC (download) Ethernet Connect

Remark
Rear gender(1EA) Support HDMI2.1 Support HDMI2.1 Support HDMI2.1 Support HDMI2.1 Rear(AV Gender), L/R Input : Rear AV and DVI use same jack Rear(1EA) Rear(1EA) JPEG, MP3, DivX HD

– 6 –

Only training and service purposes.

5. External Input Support Format
5.1. HDMI Input (PC/DTV)

No. Resolution PC
1 640*350 2 720*400 3 640*480 4 800*600 5 1024*768 6 1360*768 7 1152*864 8 1280*1024

H-freq(kHz)

V-freq.(kHz)

31.46 31.46 31.46 37.87 48.36 47.71 54.34 63.98

70.09 70.08 59.94 60.31 60 60.01 60.05 60.02

9 1920*1080

67.5

10 1920*1080 11 1920*1080 12 3840*2160 13 3840*2160 14 3840*2160 15 3840*2160 16 3840*2160 17 3840*2160 18 3840*2160 19 3840*2160 20 4096*2160 21 4096*2160 22 4096*2160 23 4096*2160 24 4096*2160 25 4096*2160 26 4096*2160 27 4096*2160

134.86 135 53.95 54 56.25 61.43 67.5 112.5 134.86 135 53.95 54 56.25 61.43 67.5 112.5 134.86 135

119.88 120 23.98 24 25 29.97 30 50 59.94 60 23.98 24 25 29.97 30 50 59.94 60

28 2560*1440 29 2560*1440

88.78 182.99

59.95 119.99

Pixel clock(MHz)

Proposed

Remarks

25.17 28.32 25.17 40 65 84.75 80 109
158.4
296.7 297 296.7 297 297 296.7 297 594 593.4 594 296.7 297 297 296.7 297 594 593.4 594
241.5 497.7

EGA DOS VESA(VGA) VESA(SVGA) VESA(XGA) VESA(WXGA) VESA SXGA
WUXGA(Reduced Blanking) UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P
3K 3K

Support to HDMI-PC, Not Support for FHD.
Not Support for FHD. Not Support for FHD Not Support for FHD Not Support for FHD Not Support for FHD Not Support for FHD Not Support for FHD Not Support for FHD Not Support for FHD Not Support for FHD Not Support for FHD Not Support for FHD Not Support for FHD Not Support for FHD Not Support for FHD Not Support for FHD Not Support for FHD (UHD 60Hz models only), Support only when UHD
DeepColor is On (UHD, 8K 120Hz models only), Support only when
UHD DeepColor is On

– 7 –

Only training and service purposes.

No.

Resolution

DTV

1 640*480

2 640*480

3 720*480

4 720*480

5 720*576

6 1280*720

7 1280*720

8 1280*720

9 1920*1080

10 1920*1080

11 1920*1080

12 1920*1080

13 1920*1080

14 1920*1080

15 1920*1080

16 1920*1080

17 1920*1080

18 1920*1080

19 1920*1080

20 1920*1080

21 1920*1080

22 3840*2160

23 3840*2160

24 3840*2160

25 3840*2160

26 3840*2160

27 3840*2160

28 3840*2160

29 3840*2160

30 3840*2160

31 3840*2160

32 3840*2160

33 4096*2160

34 4096*2160

35 4096*2160

36 4096*2160

37 4096*2160

38 4096*2160

39 4096*2160

40 4096*2160

H-freq(kHz)

V-freq.(kHz)

Pixel clock(MHz)

Proposed

31.46 31.5 31.47 31.5 31.25 44.96 45 37.5 28.12 33.72 33.75 26.97 27 33.71 33.75 56.25 67.43 67.5 112.5 134.86 135 53.95 54 56.25 61.43 67.5 112.5 134.86 135 225 269.73 270 53.95 54 56.25 61.43 67.5 112.5 134.86 135

59.94 60 59.94 60 50 59.94 60 50 50 59.94 60 23.97 24 29.97 30 50 59.94 60 100 119.88 120 23.98 24 25 29.97 30 50 59.94 60 100 119.88 120 23.98 24 25 29.97 30 50 59.94 60

25.12 25.12 27 27.02 27 74.17 74.25 74.25 74.25 74.17 74.25 63.29 63.36 79.12 79.2 148.5 148.35 148.5 297 296.7 297 296.7 297 297 296.7 297 594 593.4 594 1188 1186.8 1188 296.7 297 297 296.7 297 594 593.4 594

SDTV 480P SDTV 480P SDTV 480P SDTV 480P SDTV 576P HDTV 720P HDTV 720P HDTV 720P HDTV 1080I HDTV 1080I HDTV 1080I HDTV 1080P HDTV 1080P HDTV 1080P HDTV 1080P HDTV 1080P HDTV 1080P HDTV 1080P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P UDTV 2160P

Remarks
Not Support for FHD. Not Support for FHD. Not Support for FHD. Not Support for FHD. Not Support for FHD. Not Support for FHD. Not Support for FHD. Not Support for FHD. Not Support for FHD. Not Support for FHD. Not Support for FHD. 4K120 model (LM21U HDMI 3,4 port, O20N) or
8K model Not Support for FHD. Not Support for FHD. Not Support for FHD. Not Support for FHD. Not Support for FHD. Not Support for FHD. Not Support for FHD. Not Support for FHD.

– 8 –

Only training and service purposes.

No.

Resolution

DTV

41 4096*2160

42 4096*2160

43 4096*2160

44 7680*4320

45 7680*4320

46 7680*4320

47 7680*4320

48 7680*4320

49 7680*4320

50 7680*4320

51 7680*4320

H-freq(kHz)

V-freq.(kHz)

Pixel clock(MHz)

Proposed

225 269.73 270 107.89 108 110 131.87 132 220 263.74 264

100 119.88 120 23.98 24 25 29.97 30 50 59.94 60

1188 1186.8 1188 1188 1188 1188 1188 1188 2376 2376 2376

UDTV 2160P UDTV 2160P UDTV 2160P 8K 8K 8K 8K 8K 8K 8K 8K

Remarks
4K120 model (LM21U HDMI 3,4 port, O20N) or
8K model
8K Model Only. 8K Model Only. 8K Model Only. 8K Model Only. 8K Model Only. 8K Model Only. 8K Model Only. 8K Model Only.

– 9 –

Only training and service purposes.

SOFTWARE UPDATE

1. USB DOWNLOAD
(1) Plug in the USB to the TV (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.

2. NSU DOWNLOAD
(This Function is needed to connect to the internet.)
Case 1) Auto Update On
(1) Go 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

– 10 –

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
Case 2) NOT Allow Automatic Updates Toggle Item
(1) Go to Menu All Settings Support Software Update

(5) [CHECK NOW] : Just start the update [Close] : Close the pop-up

(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

– 11 –

Only training and service purposes.

– 12 –

3.3V

13V

3.3V

3.5V

Normal

3.5V_ST

13V

3.5V

13V

ST_BY

1.1V

1.8V

1.1V DDR

3.5V 1.8V DDR

0.8V
0.8V 13V Core

0.8V
0.8V CPU

13V

Normal

1.8V 1.1V

LPDDR4 8Gb

0.95V 0.8V DDR/C4TX
0.8V 1.8V 3.3V 1.1V
MICOM

X_TAL 50MHz
3.5V_ST

To 13V Panel

1.8V 13V
1.8V

0.8V 0.8V

Vx1 41P (8 lane)

LPDDR4 16Gb
Vx1

I2C_4
eMMC CLK/DATA/STRB

Signal Path Power supply
Power of In/output

Vx1 51P (8 lane) Front Audio AMP Woofer Audio AMP
Sub Assy

3.3V 3.3V 13V
13V

Main IC
Vx1
I2S Out I2C 0 Wov CLK out / DataIn

IR/Key

SPDIF OUT

USB_WIFI ETHERNET CVBS/YPbPr

3.5V_ST

IF IF_S
TS I2C3

AMP
MAX323

3.5V_ST

AV/COMP

SPDIF H/P RS-232 IR Blaster

IR / KEY

LAN

To WIFI/BT

Combo

OPT

13V 3.5V_ST

NVRAM (256Kb)

5V OCP

eMMC (8GB)
USB1 (2.0) USB2 (2.0) USB3 (2.0) HDMI1 HDMI2(ARC) HDMI3 HDMI4

3.3V
1.8V
From Power
B/D

IQ (+/-), IP(+/-)

IF (+/-) 3.3V

TUNER (Air)

TUNER (Cable)

Air

Cable

BLOCK DIAGRAM

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.

910

400

570

920

AR2 A10 700
Stand Screw

800

900

HW1

540

120 500
501

HS1

HP1

LV1 LV2

HR2

121

530

200 200T HR1

810

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Only training and service purposes.

ASSEMBLY / DISASSEMBLY GUIDE
1. DISASSEMBLY
(1) Dis-Assemble STAND COVER.

1 Latch : 2 EA

Check the LATCH Position.
(2) Unfix SCREW and DisAssemble the STAND.

– 14 –

Only training and service purposes.

(3) DisAssemble the SCREW and BRACKET from the BRACKET. (4) Unfasten the HARNESS from POWER PCB WAFER.

DisAssemble the SCRW and BRACKET.
2

DisAssemble the WAFER.

Description

Qty

Specification

CHASSIS ASSEMBLY,SUB 1 SUB EDX1C 48/55/65CX, 55/65BX

SCREW,MACHINE

1 BRH + 3M 5.5M SWCH10A FZB N –

(5) Unfix SCREW and DisAssemble the REAR COVER from the MODULE. * Put hand on the marked area( O ), Separate the back cover to the top.

Check the LATCH Position.
1

Description

Qty

Specification

COVER ASSEMBLY,REAR 1 OLED48CX . 48″ CX COVER ASSEM

SCREW,MACHINE

4 BRH + 3M 5.5M SWCH10A FZB N –

– 15 –

Only training and service purposes.

(6) Unfix the TAPE from the harness. 1

No
(7) Unfasten the HARNESS.

Description
TAPE,POLYESTER

Qty

Specification

4 POLYESTER 100% FR(FIRE RESISTA

– 16 –

Only training and service purposes.

(8) DisAssemble and UnFix the SUB PCB ASSY from the MODULE. IR ASSY
Release

2
Release

WIFI ASSY 1

Description

Qty

Specification

BRACKET ASSEMBLY,SUB 1 BRACKET OLED48CX – IR ASSY(IR

SCREW,MACHINE

1 BRH + 3MM 5.5MM SWCH18A FZMW N

(9) Disassemble SPEAKER L/R.

1
No

Description
SPEAKER ASSEMBLY SPEAKER ASSEMBLY

Qty

Specification

1 K0600712 65 55 CX BX RIGHT 20W

1 K0600711 65 55 CX BX LEFT 20W

– 17 –

Only training and service purposes.

(10) Disassemble/Unfix the MAIN PCB. (11) Disassemble/Unfix the POWER. (12) Unfasten the HARNESS.
No

3 2
3 3

Description

Qty

Specification

CHASSIS ASSEMBLY

1 MAIN EDX1C OLED48CX6LA MAIN EB

POWER SUPPLY ASSEMBLY 1 FREE LGP48CX-20OP LCD YY –

SCREW,MACHINE

12 BRH + 3MM 5.5MM SWCH18A FZMW N

HARNESS,SINGLE HARNESS,SINGLE

1 20022HS-14B2 TO 20022HS-14B2_1 1 20022HS 15B2 TO 20022HS 15B2 L

1 3

(13) Unfix and Disassemble the SCREW and the SUPPORTER,VESA.

2 1

Unfasten After DisAssemble the screw
2 1

2 1

Description

Qty

Specification

SUPPORTER,VESA

4 PRESS EGI 1.6 SUPPORTER EGI 32

SCREW,MACHINE

4 BRH + 3MM 5.5MM SWCH18A FZMW N

– 18 –

Only training and service purposes.

(14) Unfix and Disassemble the SUPPORTER, STAND.
1 3
3

3 3

Description

Qty

Specification

PLATE

1 PRESS HGI 1.6T SUPPORTER HGI E

SCREW,MACHINE

4 BRH + 3MM 5.5MM SWCH18A FZMW N

– 19 –

Only training and service purposes.

2. ASSEMBLY
* This work should be worked by 2 persons.
(1) Input the Module. (2) Remove the MODULE protective film. [Self/Successive Check]
1. [Visual Check] Check the damage and dirt on the MODULE [Key Control Point]
* Taking the outside when handling the LCD module * Caution while handling the LCD module. (damage, removing the harness, hands print, dirt)
1 (Do not remove module front protection film)

Description

Qty

Specification

OLED,MODULE-AM

1 LE480AQD-ENA2 47INCH 3840X2160

– 20 –

Only training and service purposes.

(3) Assemble/Fix the SUPPORTER + MODULE
[Self/Successive Check] 1. [Visual Check] Check the SUPPORTER fix condition.

Check the sponge on Supporter, Stand Guide when assembly

B8/C8

B9/C9/ET96/CX9/BX9

No Description PLATE SCREW,MACHINE

Qty

Specification

1 PRESS HGI 1.6T SUPPORTER HGI E

4 BRH + 3MM 5.5MM SWCH18A FZMW N

(4) Assemble/Fix the SUPPORTER + MODULE
[Self/Successive Check] 1.[Visual Check] Check the SUPPORTER fix condition.

2 1

Assemble the screw after insert
2 1

2 1

Description

Qty

Specification

SUPPORTER,VESA

4 PRESS EGI 1.6 SUPPORTER EGI 32

SCREW,MACHINE

4 BRH + 3MM 5.5MM SWCH18A FZMW N

– 21 –

Only training and service purposes.

(5) Assemble/Fix the MAIN PCB + MODULE. (6) Assemble/Fix the POWER + MODULE. (7) Insert the HARNESS.
1) 14P HARNESS : POWER <-> MODULE A 2) 15P HARNESS : POWER <-> MODULE B
[Key Control Point] * When assemble the PCB and Fix with the screw, be careful not to damage at PCB. * Insert Harness into the WAFER until Connect sound is occurred.

3 2
3 3

3 1
3

Description

Qty

Specification

CHASSIS ASSEMBLY

1 MAIN EDX1C OLED48CX6LA MAIN EB

POWER SUPPLY ASSEMBLY 1 FREE LGP48CX-20OP LCD YY –

SCREW,MACHINE

12 BRH + 3MM 5.5MM SWCH18A FZMW N

HARNESS,SINGLE

1 20022HS-14B2 TO 20022HS-14B2_1

HARNESS,SINGLE

1 20022HS 15B2 TO 20022HS 15B2 L

– 22 –

Only training and service purposes.

(8) Assemble SPEAKER L/R + SUPPORTER. [Self/Successive Check]
1. [Visual Check] Check the SUPPORTER fix condition.
No

Description

Qty

Specification

CHASSIS ASSEMBLY

1 MAIN EDX1C OLED48CX6LA MAIN EB

POWER SUPPLY ASSEMBLY 1 FREE LGP48CX-20OP LCD YY –

SCREW,MACHINE

12 BRH + 3MM 5.5MM SWCH18A FZMW N

HARNESS,SINGLE

1 20022HS-14B2 TO 20022HS-14B2_1

HARNESS,SINGLE

1 20022HS 15B2 TO 20022HS 15B2 L

3 2
3 3

3 1
3

(9) Assemble/Fix the SUB PCB ASSY + MODULE [Self/Successive Check]
1. [Visual Check] Check to fix the PCB with the screw for needed points.
[Key Control Point] * When assemble the PCB and Fix with the screw, be careful not to damage at PCB.
Insert Harness into the STOPPER until Connect sound is occurred

Insert

2 Insert

Description

Qty

Specification

BRACKET ASSEMBLY,SUB 1 BRACKET OLED48CX – IR ASSY(IR

SCREW,MACHINE

1 BRH + 3MM 5.5MM SWCH18A FZMW N

– 23 –

Only training and service purposes.

(10) Insert the HARNESS 1) MAIN PCB P7602 MODULE “A” 2) MAIN PCB P7601 MODULE “B” 3) MAIN PCB P7603 POWER P201 4) IR/WIFI ASSY MAIN PCB P4000 5) MAIN PCB P5901 SPEAKER “C” SPEAKER “D”
[Key Control Point] * Insert Harness into the WAFER until Connect sound is occurred. * Be careful a particle in FFC Pin.

P201
“C” IR ASSY

P7603

“A”

P7602

“B”

P7601

P5901

P4000

“D”

WIFI ASSY

– 24 –

Only training and service purposes.

(11) Arrange the harness. (12) When Attach the tape for fixing Harness at Module, Rub the tape 2~3 times for adhering totally.

Insert the speaker harness
1

Don’t hang on the latch. Don’t hang IR FFC CABLE.
1

”

” Arrange the harness lead as

shown in the figure.

Be careful not positioned

on the PCB.

Description

Qty

Specification

TAPE,POLYESTER

4 POLYESTER 100% FR(FIRE RESISTA

– 25 –

Only training and service purposes.

(13) Assemble/Fix the REAR COVER + MODULE [Self/Successive Check]
1.[Visual Check] Check the REAR COVER’s Appearance Status whether there is a contraction, a Whitening or a Scratch,,, etc. 2.[Visual Check] Check that there are dropped screw /foreign material in system before the REAR COVER. 3.[Visual Check] Check that Harness is Connected closely.
Check the gap Module to B/C after assembly
Push the LATCH
1

2
No

Check Assembly Condition (If There is uneven step, It is supposed to be Assembly error, check Latch again) Side AV Bracket and B/C after assembly.
2

Description
COVER ASSEMBLY,REAR SCREW,MACHINE

Qty

Specification

1 OLED48CX . 48″ CX COVER ASSEM

4 BRH + 3M 5.5M SWCH10A FZB N –

Assemble from the Bottom Of the Rear Cover

– 26 –

Only training and service purposes.

(14) Assemble REAR COVER + REAR COVER
(15) Insert the HARNESS
POWER CORD -> POWER PCB WAFER
(16) Assemble/Fix the BRACKET + REAR COVER + MODULE [Self/Successive Check]
1.[Visual Check] Check the REAR COVER’s Appearance Status whether there is a contraction, a Whitening or a Scratch,,, etc. 2.[Visual Check] Check that there are dropped screw /foreign material in system before the REAR COVER. 3.[Visual Check] Check that Harness is Connected closely.

Check the direction

Insert to the POWER PCB

Attention the cable isn’t located between pem-nut and bracket

Description

Qty

Specification

CHASSIS ASSEMBLY,SUB 1 SUB EDX1C 48/55/65CX, 55/65BX

SCREW,MACHINE

1 BRH + 3M 5.5M SWCH10A FZB N –

– 27 –

Only training and service purposes.

(17) Assemble the STAND and Fix the SCREW.

(18) Assemble STAND COVER with Latch.

1 Latch : 2 EA

Check the LATCH Position

– 28 –

Only training and service purposes.

TROUBLE SHOOTING GUIDE
Copyright © 2021 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

No video/Normal audio

No video/No audio

3 A. Video error

Picture broken/ Freezing

Color error

5
6
7 B. Power error
8
9 C. Audio error
10

Vertical/Horizontal bar, residual image, light spot, external device color error

No power

Off when on, off while viewing, power auto on/off

No audio/Normal video

Wrecked audio/discontinuation/noise

Remote control & Local switch checking

MR21 operating checking

D. Function error

Wifi operating checking

14 15 E. Noise 16 F. Exterior error

External device recognition error

Circuit noise, mechanical noise

Exterior defect

Remarks

First of all, Check whether there is SVC Bulletin in GSCS System for these model.
Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

Standard Repair Process
Error symptom

A. Video error
No video/ Normal audio

Established date
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,,,)

No video Normal audio

Normal Y audio

N
Move to No video/No audio

A1
Check Back Light On with naked eye

Y On

A18
Check Power Board 12V etc.

A18

N Check Power Board 12V output

Normal Y voltage
N
Repair Power Board or parts

Replace T-con/Main Board or module

Normal Y voltage

Replace Inverter or module

End

Repair Power Board or parts

Precaution A4 & A2
Always check & record S/W Version and White Balance value before replacing the Main Board

Replace Main Board

Re-enter White Balance value

1
Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

Standard Repair Process
Error symptom

A. Video error
No video/ No audio

Established date
Revised date

No Video/ No audio

A18
Check various voltages of Power Board (12V…)

Normal Y voltage?

Check and replace MAIN B/D

End

Replace Power Board and repair parts

2
Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

Standard Repair Process
Error symptom

A. Video error
Picture broken/ Freezing

Established date
Revised date

A3
Check RF Signal level

. By using Digital signal level meter . By using Diagnostics menu on OSD
( Advanced Channels Channel Tuning Manual Tuning Check the Signal ) – Signal strength (Normal : over 50%) – Signal Quality (Normal: over 50%)

Normal Signal?

Check whether other equipments have problem or not. (By connecting RF Cable at other equipment)

DVD Player ,Set-Top-Box, Different maker TV etc`

N
Check RF Cable Connection
1. Reconnection 2. Install Booster

Normal Y

Check

Picture?

S/W Version

Normal N Picture?

Contact with signal distributor or broadcaster (Cable or Air)

SVC

Bulletin?

Y S/W Upgrade

Normal

Picture?

Check Tuner Y soldering
N

Replace Main B/D

3
Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

Standard Repair Process
Error symptom

A. Video error
Color error

Established date
Revised date

A6
Check color by input -External Input -AV -HDMI
A8
Check Test pattern

Color Y error?
N

Check and replace Link Cable (EPI or Vx1 Cable) and contact condition

Check error color input mode

Color Y error?
N

Replace Main B/D

Color Y error?
N

Replace module

End

External Input/ Component error

Check external device and cable

HDMI error

Check external device and cable

External Y device/Cable
normal
N
Request repair for external device/cable
N
External Y device/Cable
normal

Replace Main/T-con B/D Replace Main/T-con B/D

4
Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

Standard Repair Process
Error symptom

A. Video error
Vertical / Horizontal bar, residual image, light spot, external device color error

Vertical/Horizontal bar, residual image, light spot

A6
Check color condition by input -External Input -HDMI
A8
Check Test pattern

Screen Y normal?
N
Replace module

Check external device connection condition

Y Normal?
N

A7
Check and replace Link Cable

Request repair for external device

Established date
Revised date

Screen N normal?
Y

Replace Main/T-con B/D
For LGD panel

Replace Main B/D End
For other panel

Replace Module
N
Screen normal?
Y
End

External device screen error-Color error

Check S/W Version

Check N version

Y S/W Upgrade

Check screen condition by input -External Input -Component -HDMI/DVI

External Input error
Component error

Normal N screen?
Y
End

HDMI/ DVI
5

Connect other external device and cable (Check normal operation of External Input, Component, RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc.
Connect other external device and cable (Check normal operation of External Input, Component, RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc.

Screen N normal?
Y
Request repair for external device

Replace Main/T-con B/D

Y
Screen N normal?

Replace Main /T-con B/D

Standard Repair Process
Error symptom

B. Power error
No power

Established date
Revised date

A17

Check LED

Power Y LED On?

. Stand-By: Red or Turn On . Operating: Turn Off

Check Power cord was inserted properly

N Normal?

DC Power on by pressing Power Key On Remote control

Normal N operation?

A18
Check Power On `”High”

OK?

Replace Power B/D

Y
A18
Measure voltage of each output of Power B/D

Replace Main B/D

Check Main ST-BY 3.5V
A18

Y
Normal voltagYe?
N

Normal Y voltage?
N
Replace Power B/D

Replace Main B/D

Replace Power B/D

6
Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

Standard Repair Process
Error symptom

B. Power error
Off when on, off while viewing, power auto on/off

Established date
Revised date

Check outlet Check A/C cord

N Error?

Check for all 2- phase power out

Y
Fix A/C cord & Outlet and check each 2 phase out

A19
Check Power Off Mode

CPU Abnormal

Replace Main B/D

Normal?

End

Abnormal 1

N Replace Power B/D

A18
(If Power Off mode is not displayed) Check Power B/D voltage
Caution Check and fix exterior of Power B/D Part

Normal Y voltage?
N
Replace Power B/D

Replace Main B/D

7
Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

Standard Repair Process

Error symptom

B. Power error
Off when on, off while viewing, power auto on/off

Established date
Revised date

* Please refer to the all cases which can be displayed on power off mode.

Power Off list

Explanation

KEYTIMEOUT

Power off when TV is not turned off during a certain time RESULT : micom force to trigger TV power off. CONDITION : When pressing power key while power on/off status, CPU does not response within 8 seconds

1SEC Power OFF
ACDET
5V MNT CPUABNORMAL
NO POLING CPUCMD
INV_ERROR ONRF_FAIL

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 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.) If there are many ACDETs connected, Power Board is defective Power off by unstable AC power detect. RESULT : micom check the stable power. CONDITION : When AC on or DC on, stabilization check routine (Power Detect High Check) fail after multi power on. If the CPU attempts to reset in case of abnormal operation and Shut Down in case of failure. Power off when receiving no ack. RESULT : TV power off/on (Reboot) CONDITION : There is no I2C response from CPU for 15 seconds.
Power off by main SoC command.
Power off by module error (OLED) CONDITION : OLED Module send signal to micom RESULT : Reboot, CONDITION : OLED module compensation is running but fails.

PNWASHFAIL

Power off by panel noise wash function fail case.

RESET KEY
OFFTIMER SLEEPTIMER
NOSIG FANSTOP INSTOP AUTO OFF RESREC RECEND SWDOWN UNKNOWN COMP_END PNWASHDONE

When Micom is reset by AC Off Power off by Local key Power off by Off timer Power off by sleep timer Power off by No Signal Power off by FAN operation stopped Power off by Instop Key Power off by auto off function Power off by reserved recording Power off when recording stops Reboot by SW down load function No meaning (same as initial value) OLED threshold voltage degradation(Compensation) completes. Power off by panel noise wash function complited. (OLED)

Action contents Check & Change Main B/D
Check & Change Main B/D Normal
Check & Change Power B/D Check & Change Power B/D Check & Change Main B/D Check & Change Main B/D Check & Change Main B/D Check & Change OLED Module Check & Change OLED Module Check & Change OLED Module
Normal Case

Standard Repair Process
Error symptom

C. Audio error
No audio/ Normal video

Established date
Revised date

No audio Screen normal

A20
Check user menu > Speaker off

A21+A18

Off

N Check audio 20V of Power Board

Normal Y voltage
N

Cancel OFF

Replace Power Board and repair parts

Check Speaker disconnection

N Disconnection

Replace MAIN Board

End

Y Replace Speaker

Standard Repair Process
Error symptom

C. Audio error
Wrecked audio/ discontinuation/noise

Established date
Revised date

abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio

Check input signal -RF -External Input signal

Signal

normal?

(When RF signal is not received) Request repair to external cable/ANT provider
(In case of External Input signal error) Check and fix external device

Wrecked audio/ Discontinuation/
Noise for all audio

Check and replace speaker and connector

A21+A18
Check audio B+ Voltage (20V)

Wrecked audio/ Discontinuation/
Noise only for D-TV
Wrecked audio/ Discontinuation/
Noise only for Analog

Replace Main B/D

Normal Y voltage?
N

Replace Power B/D

Wrecked audio/

Replace Main B/D

End

Discontinuation/

Noise only

for External Input Connect and check

N Normal

other external

audio?

device

Check and fix external device

Standard Repair Process
Error symptom

D. Function error
Remote control & Local switch checking

Established date
Revised date

1. Remote control(R/C) operating error

A22

Check R/C itself Operation

Normal Y operating?
N

Check & Repair Cable connection Connector solder

Check R/C Operating When turn off light in room

Check & Replace Baterry of R/C

If R/C operate, Explain the customer cause is interference
from light in room.

Normal Y operating?

N Replace R/C

A22

Normal N Check B+3.5V

operating?

On Main B/D

Normal Y Voltage?

A22
Check IR Output signal

Replace Main B/D
Normal Y Signal?

Y Close

A18

Check 7.8v on Power B/D Replace Power B/D or Replace Main B/D
(Power B/D don’t have problem)

N
Repair/Replace IR B/D

Standard Repair Process
Error symptom

D. Function error
Magic remote operating checking

Established date
Revised date

2. MR21(Magic Remote control) operating error

Check the INSTART menu

RF Receiver N Check MR21

Ver is “00.00”?

itself Operation

Normal Y operating?

A23 Y
Check & Repair RF assy
connection

N
Check & Replace Battery of MR21

Press the wheel

Is show ok N message?
Y
Close

Turn off/on the set and press
the wheel

A4
RF Receiver ver N is “00.00”?

Y Replace MR21

Normal Y operating?
N
Replace MR21

Is show ok N message?
Y

Press the back key about 5sec

Close * If you conduct the loop at 3times, change the MR21.

Standard Repair Process Error
symptom
3.Wifi operating error

D. Function error
Wifi operating checking

Check the INSTART menu

Wi-Fi Mac

value is “NG”?

A24
Check the Wifi wafer 1pin

A24 Y
Check & Repair Wifi cable connection

A4
Wi-Fi Mac value N is “NG”?
Y
Change the Wifi assy

Established date
Revised date

Normal N Voltage?
Y
Close

Replace Main B/D

Standard Repair Process
Error symptom

D. Function error
External device recognition error

Established date
Revised date

Check input signal

Signal Y input?
N

Check technical information – Fix information – S/W Version

Check and fix external device/cable

Technical

information?

Fix in accordance with technical information

External Input and Component Recognition error
HDMI/ DVI, Optical Recognition
error

Replace Main B/D Replace Main B/D

Standard Repair Process
Error symptom

E. Noise
Circuit noise, mechanical noise

Established date
Revised date

Identify nose type

Circuit noise

Check location of noise

Mechanical noise

Check location of noise

Replace PSU

Mechanical noise is a natural
phenomenon, and apply the 1st level
description. When the customer does not
agree, apply the process by stage. Describe the basis of the description in “Part related to nose” in the Owner’s Manual.

When the nose is severe, replace the module (For models with fix information, upgrade the S/W or provide the description)
OR
If there is a “Tak Tak” noise from the cabinet, refer to the KMS fix information and then proceed as shown in the solution manual (For models without any fix information, provide the description)

Standard Repair Process
Error symptom

F. Exterior defect
Exterior defect

Established date
Revised date

Zoom part with exterior damage

Module damage

Replace module

Cabinet damage
Remote control damage
Stand dent

Replace cabinet Replace remote control Replace stand

Contents of Standard Repair Process Detail Technical Manual

No.

Error symptom

1 A. Video error_ No video/Normal audio

Content Check White Balance value

2 A. Video error_ video error /Video
3 lag/stop

TUNER input signal strength checking method
Version checking method

Tuner Checking Part

A. Video error _Vertical/Horizontal bar, residual image, light spot

Connection diagram

6 A. Video error_ Color error

Check Link Cable (Vx1/EPI) reconnection condition

Check Cable (1) ~ (2)

<Appendix> 7 Defected Type caused by T-Con/
Inverter/ Module

Exchange Main Board (1) ~ (3) Exchange Module (1) ~ (3) Exchange T-Con (1) ~ (2) Exchange Power Board(PSU)

Page A2

Remarks

A3
A4 A5 A6
A7 A-1/11 A-2/11 A-3/11 ~ A-5/11 A-6/11 ~ A-8/11 A-9/11 ~ A-10/11 A-11/11

Contents of Standard Repair Process Detail Technical Manual
Continued from previous page

No.

Error symptom

8 B. Power error_ No power
9

B. Power error_Off 10
(when on/off, while viewing)

11 C. Audio error_ No audio/Normal video
12

13 D. Function error
14

Content Check front display LED Check power input Voltage & Main ST-BY 3.5V POWER OFF MODE checking method
Checking method in menu when there is no audio Voltage and speaker checking method when there is no audio Remote control operation checking method
Motion Remote operation checking method

Page A8 A9 A10
A11 A12 A13 A14

Remarks

15 E. Etc
16

How to use the Service remote control Check items after Main B/D replacement

A15-A17 A18

Standard Repair Process Detail Technical Manual

Error symptom

A. Video error_No video/Normal audio

Established date

Content

Check White Balance value

Revised date

Entry method
1. Press the ADJ button on the remote control for adjustment. 2. Enter into White Balance. 3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm),
re-enter the value after replacing the MAIN BOARD.
A2
Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

Standard Repair Process Detail Technical Manual

Error symptom

A. Video error_Video error, video lag/stop

Established date

Content

TUNER input signal strength checking method

Revised date

All settings General Programmes Programme
Tuning & settings Manual Tuning

Standard Repair Process Detail Technical Manual

Error symptom

A. Video error_Video error, video lag/stop

Established date

Content

Version checking method

Revised date

1. Checking method for remote control for adjustment

Version

Press the IN-START with the remote control for adjustment
A4

Standard Repair Process Detail Technical Manual

Error symptom

A. Video error_Video error, video lag/stop

Established date

Content

TUNER checking part

Revised date

48_55_65_77C1

83C1

Checking method: 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2. After measuring each voltage from power supply, finally replace the MAIN BOARD.
A5
Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

Standard Repair Process Detail Technical Manual

Error A. Video error _Vertical/Horizontal bar,

Established

symptom

residual image, light spot

date

Content

connection diagram

Revised date

48_55_65_77C1

83C1

Standard Repair Process Detail Technical Manual

Error symptom

A. Video error_Color error

Established date

Content

Check Link Cable(VX1/EPI) reconnection condition

Revised date

Appendix. Examples of Symptoms(Image error)

Item

Symptom Name

Cause

CABLE

Color smear

Poor broken pin of FFC cable

Check for poor cable contact Symptom Image

Color is Excessive due to FFC Cable CABLE R Color Excessive
Contact.

screen is dark due to poor contact due CABLE Screen darkness to disconnection of the FFC cable pin.

G color transient due to poor FFC cable

CABLE G Color Excessive

connection

A – 1/11

Appendix. Examples of Symptoms(Image error)

Item

Symptom Name

Cause

CABLE Color spread

LVDS cable connection problem

Check for poor cable contact Symptom Image

CABLE Color spread

LVDS cable connection problem

CABLE Color spread

LVDS cable connection problem

CABLE

Due to foreign substance withi nLVDS

Screen stop

cable PIN

A – 2/11

Appendix. Examples of Symptoms(Main)

Item

Symptom Name

Cause

Main

Screen noise

Bit noise from horizontal screen

Main

Screen noise

Broken screen due to Main IC problem

Main

Dark picture

Dark left-side screen

Main Broken picture

Top/bottom screen part Picture problem due to tuner
Inner side quality problem
A – 3/11

Appendix. Examples of Symptoms(Mai

Download

LG TV OLED48C1PUB Oled Owner’s Manual

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