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LG OLED55CS A Series Service Manual
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LG OLED55CS A Series Service Manual

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OLED TV
SERVICE MANUAL
CHASSIS : EB21C / ED21C
MODEL : OLED55CS**A
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71888105 (2208-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.
OLED65CS**A

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  • Page 1 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.
  • Page 2 BLOCK DIAGRAM ................. 12 EXPLODED VIEW .................. 13 ASSEMBLY / DISASSEMBLY GUIDE ............ 14 TROUBLE SHOOTING GUIDE ..........APPENDIX webOS22 new features & Usability ........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 3: Safety Precautions

    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.

  • Page 4: Servicing Precautions

    - 4 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 5 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.

  • Page 6: Specification

    - S Band III : 300 ~ 470 MHz - DVB-S/S2* (950 ~ 2150 MHz) - DVB-C* (46 ~ 890 MHz) 2) Analogue TV (46 ~ 862 MHz) - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 7 Optical Audio out USB Input (3 EA) EMF, For SVC (download) Ethernet Connect STP cable (1EA) PCMCIA Card slot PCMCIA Slot only EU/CIS (1EA) - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 UHD DEEP COLOUR ON When HDMI1,2,3 4096*2160 134.86 59.94 593.407 UDTV 2160P UHD DEEP COLOUR ON When HDMI1,2,3 4096*2160 135.00 60.00 UDTV 2160P UHD DEEP COLOUR ON - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 297.00 UDTV 2160P 3840*2160 56.25 25.00 297.00 UDTV 2160P 3840*2160 67.5 30.00 297.00 UDTV 2160P 4096*2160 53.95 23.97 296.703 UDTV 2160P 4096*2160 UDTV 2160P - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 (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 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 11 “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 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 12: Block Diagram

    BLOCK DIAGRAM - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 13: 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. - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 2. Remove screw 4 EA, disassemble back cover from module. * Put hand on the marked area( ), separate the back cover to the top. Screw : 4ea Latch : 12ea - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 3. Remove screw 1 EA, disassemble Wifi/Jog assy. Screw : 1ea 4. Remove the latch 2 EA, disassemble IR assy. Latch : 2ea Slide - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 5. Remove all sort of cable. 6. Disassemble speaker. - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 7. Remove screw 12 EA, disassemble Main PCB and PSU. Screw : 12ea 8. Remove screw 7 EA, disassemble stand guide and stand fixer. Screw : 7ea - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 9. Remove screw 4 EA, disassemble VESA Bracket Screw : 4ea - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 19: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 20 E. Noise Circuit noise, mechanical noise F. Exterior error Exterior defect 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.
  • Page 21 ☞A4 & A2 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 22 Check various voltages Check and No Video/ Normal of Power Board (Main) replace No audio voltage? (20V, 12V…) MAIN B/D Replace Power Board and repair parts Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 23 1. Reconnection 2. Install Booster S/W Upgrade Contact with signal distributor Normal or broadcaster (Cable or Air) Picture? Normal Picture? Replace Main B/D Close Close Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 24 Replace Main B/D error cable normal Request repair for external device/cable Check external External HDMI device and device/Cable Replace Main B/D error cable normal Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 25 (Check normal operation of HDMI/ Screen screen? Main B/D / External Input, Component, normal? RGB and HDMI/DVI by Module connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 26: Power Error

    Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Close Normal Check ST-BY (7.8V) voltage? ☞A9 Replace Power B/D Replace Power Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 27 Normal Replace Main B/D Check Power B/D voltage? voltage ※ Caution Check and fix exterior Replace Power B/D of Power B/D Part Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 28 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) Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 29 20V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Speaker Replace MAIN Board Disconnection disconnection connecting Speaker Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 30 (In case of Connect and check Normal External Input other external audio? signal error) device Check and fix external device Check and fix external device Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 31: Function Error

    Replace Main B/D (Power B/D don’t have problem) If R/C operate, Normal Close operating? Explain the customer cause is interference from light in room. Replace R/C Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 32 Down load the Firmware •If you conduct the loop at 3times, * INSTART MENU  12.RF Remote control Test change the MR22.  Receiver Firmware download Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 33 Voltage? 1pin Main B/D INSTART menu ☞A14 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value Close is “NG”? Change the Wifi assy Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 34 Recognition error signal - S/W Version HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in Recognition external device/cable accordance error with technical information Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 35 “Part related to nose” in the Owner’s then proceed as shown in the solution manual Manual. (For models without any fix information, provide the description) Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 36 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 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 37 Exchange Main Board (2) A-2/5 <Appendix> Exchange Power Board (PSU) A-3/5 Defected Type caused by T-Con/ Power / 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.
  • Page 38 Motion Remote operation checking method D. Function error Wifi operation checking method How to use the Service remote control A15-A17 E. Etc Check items after Main B/D replacement Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 39 Check the voltage of R7632 (Blue). If the voltage is low, Vx1 is locked.(OK) - Low (0V) : Normal, High (3.3V) : Burnt Detect Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 40 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. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 41 All Settings  Programmes  Programme Tuning & setting  Manual Tuning  Antenna DTV When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 42 A. Video error_Video error, video lag/stop Error symptom date Revised Content OLED TV Version checking method date Version Press the IN-START with the remote control for adjustment Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 43 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. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 44 Revised Content OLED TV Connection diagram date As the part connecting to the external input, check the screen condition by signal Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 45 Error symptom date Revised Content Check Link Cable (Vx1) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 46 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.
  • Page 47 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.
  • Page 48 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.
  • Page 49 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.
  • Page 50 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.
  • Page 51 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.
  • Page 52 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.
  • Page 53 In this case please exchange the module difference Compensation error when Power On/off Module Green light 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.
  • Page 54 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.
  • Page 55 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.
  • Page 56 B. Power error _No power Error symptom date Revised Content Check front Power Indicator date ST-BY condition : On or Off Power ON condition : Turn Off Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 57 Check the DC 12VT line for ST-BY Voltage 55/65CS Power To Main B’d (ST-BY : 7.8V, Normal : 12V) P201 P252 P251 Power To Module Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 58 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). Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 59: 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. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 60 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. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 61 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. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 62 Checking order 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) Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 63 Standard Repair Process Detail Technical Manual Established E. Etc Error symptom date Revised Content How to use the Service remote control date How to access the remote control Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 64 Digital EYE function ON/OFF For some Model, access to the Test Pattern TILT Used for screen tilting change (Access to the old PDP control mode) Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 65 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 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 66 - 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. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 67 & Usability Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 68 - [Remote Control] webOS5.0 (2020) vs. webOS6.0 (2021) vs. webOS22 - [Home screen] webOS6.0 (2021) vs. webOS22 - [Homeboard] webOS4.5 (2019) ~ webOS22 dashboard supported products - WebOS22 new features & usability Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 69 Region Regio -/LIST changed to GUIDE/- General External input Settings Remote Control TV Icon printed Screen ratio (Netflix, Amazon, etc.) (Netflix, Amazon etc.) Screen ratio Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 70 - There is not much useful content in the top category. Added the category list editing function → The order of the top/ bottom of the list has been changed Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 71 [Homeboard] List of LG products that can be registered on webOS4.5 ~ webOS22 Home Dashboard * Push Compatibility Products notification webOS 4.5 (2019) webOS 5.0 (2020) 2021 webOS 6.0 2022 webOS22 supported Refrigerator Available after SW update Wine refrigerator in March, 2022...
  • Page 72 : You can watch a workout video on the main screen and observe yourself exercising using the camera app on the other screen at the same time. ■ Room to Room Share (Screen link): After connecting your LG TVs at home, you can watch the video that was only connected to the set-top box in the living room with the TV in your room.
  • Page 73 - It provides not only total TV screen time, but also daily/ weekly - Even if your child presses the remote control mistakenly, the screen time for each app. volume won’t go above 60. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 74 Standby Mode: Voice recognition available Back Here is the latest trending content. Background Mode Voice recognition : Hi LG, what is trending now? when the background mode is over Standby Q1. How much electricity does my TV consume in Background Mode or...
  • Page 75 “ Send Screen” available TV : Z2, G2, C2, QNED99/95 function? “ Get Screen” available TV : All LG TV models launched in 2022 During the screen transmission process, the original image is compressed and then data is transmitted through a wireless network.
  • Page 76 ● ● ○ Q5. Screen Saver automatically starts when no movement is detected for 30 Gallery ● minutes while watching videos using Multi View, (OLED) Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 77 TV are on the same network Live TV / Switch input - Content search is always supported. * Supports webOS4.5 or higher version Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 78 - Receive notifications environments. - Turn off screen - Slide show speed - Screen on time setting - Enable Illuminance sensor Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 79 Connecting device Device type Select input terminal Select STB operator or manufacturer (If not in the list, search and select)  Test remote control operation (Follow the guideline on the screen)  Completed Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 80: Tv Remote Control

    • When controlling STB using the TV remote control connected to Sender TV, the Room-to-Room share function is disconnected. The sender TV screen turns on and it starts to work as a usual TV. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 81 - Place both ends (one or two) of the IR Blaster in front of the external device remote control receiver (usually located in front of the device). Customer Service Guide Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 82 ※ When [Turn on the TV using Wi-Fi] is OFF, there may be restrictions on other functions. -Turning on the TV on ThinQ App / AirPlay / Youtube, etc Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 83 If you want to change the settings of the connected external device, please change the settings on the TV to which the external device is connected after exiting the room-to-room function. (mirroring). Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 84: Split Screen Mode

    Live TV PIP mode Screenshare(Miracast) ※ Not applicable to China/ Hong Kong Camera products App 1 Customer Service Screenshare(Miracast) HDMI Guide App 2 Camera Gallery Spotify Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 85 XXNANO76 & its derivative model Name XXNANO75 & its derivative model XXUQ91 & its derivative model Guide XXUQ90 & its derivative model XXUQ80 & its derivative model Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 86 2) Turning off the high frame mode Dolby TrueHD audio signal 3) Setting the output resolution to 4K resolution or lower, 4) After setting the audio signal to PCM or AC3 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 87 8K, or Dolby MAT/Dolby 3) Setting the output resolution to 4K resolution or TrueHD audio signal ON lower, 4) Setting the audio signal to Dolby Digital or AC3 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 88 Dolby MAT audio signal Service Audio game controller settings, you can try again after setting the audio signal to Dolby TrueHD audio signal Guide Dolby Digital or AC3. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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