LG OLED42C3 Series Service Manual
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LG OLED42C3 Series Service Manual

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OLED TV
SERVICE MANUAL
CHASSIS : E*31C
MODEL : OLED42C3***
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71991221 (2212-REV00)
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means),
publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you
have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual.
The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service
Manual.
Copyright © 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.

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Summary of Contents for LG OLED42C3 Series

  • 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 SOFTWARE UPDATE ................12 BLOCK DIAGRAM ................. 14 EXPLODED VIEW .................. 15 WIRING DIAGRAM ................16 ASSEMBLY / DISASSEMBLY GUIDE ............ 17 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • 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

    - Digital TV : DTMB (China/Hongkong), DVB-C (China) - Analogue TV : PAL 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.
  • Page 7 * 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.
  • Page 8 2 ~ 69 CATV 1 ~ 135 2 ~ 13 14 ~ 69 Colombia / Panama / Taiwan 2 ~ 69 CATV 1 ~ 125 - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 Optical Audio out Audio out HeadPhone(1EA) HeadPhone out USB Input (3EA) EMF, DivX HD, For SVC (download) JPEG, MP3, DivX HD Ethernet Connect (1EA) Ethernet Connect - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 UHD DEEP COLOUR ON When HDMI 4096*2160 134.86 59.94 593.407 UDTV 2160P UHD DEEP COLOUR ON When HDMI 4096*2160 135.00 60.00 UDTV 2160P UHD DEEP COLOUR ON - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 11 297.00 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 - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 (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.
  • Page 13 “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.

  • Page 14: Block Diagram

    BLOCK DIAGRAM - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 15: 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. - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 16: Wiring Diagram

    WIRING DIAGRAM Main Board Power Board SPEAKER SPEAKER WIFI - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 (1) Pre-Work : Stand , Power Cord Cover Disassembly 1) Stand Disassemble * Remove 2 Screws at each stand 2) Power Cord Cover Disassemble Remove 1 screw andSeparate POWER Cord - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 * Reference (when it’s difficult to disassemble back cover) ① ② Left/Right Symmetry Left/Right Symmetry Push up IR position to upward Disassemble B/C with separating fixed shapes in the left/right bottom - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 1) Remove 5 connectors to remove the main PCB. (with snap fit) 2) Remove 6 screws around the main PCB.(Using the same Screw driver with “+” tip. As before) - 19 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 3) Remove 1 screw and remove the stand supporter. (Using the same Screw driver with “+” tip. As before) - 20 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 21 3) Remove the cable from the IR Module. 4) Remove screws to separate the WiFi Module Subset.( Using the same Screw driver with “+” tip. As before) - 21 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 (3) Screw ①,②,③,④,⑤ (4) POWE Cord Cover assembly Insert POWER Cord. Push Latches and Screw. ② ③ ① (Push the LATCH) - 22 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 23: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 24 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 25 ☞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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 26 ☞A9 Check various Check and No Video/ Normal voltages of Power replace No audio voltage? Board (20V,12V…) MAIN B/D Replace Power Board and repair parts Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 27 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 28 Replace Main/T-con B/D error cable normal Request repair for external device/cable Check external External HDMI device and Replace Main/T-con B/D device/Cable error cable normal Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 29 Replace (Check normal operation of screen? HDMI/ Screen Main /T-con External Input, Component, normal? RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 30: Power Error

    Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Normal Close Check Main ST-BY 7.8V voltage? ☞A9 Replace Power B/D Replace Power B/D Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 31 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 32 Check the OLED Module ( Without BDP ) Check the FFC Cable (T-con to Main) Check the Fan & Heat Plate Normal Code - N/A Normal Code Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 33 Screen normal of Power Board voltage Speaker off Cancel OFF Replace Power Board and repair parts Check Speaker Replace MAIN Board Disconnection disconnection Replace Speaker Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 34 (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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 35: 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 36 5sec RF Receiver Close ver is “00.00”? Replace MR23 Close Replace MR23 * If you conduct the loop at 3times, change the MR23. Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 37 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 38 Recognition error - 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 39 “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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 40 Revised date Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 41 Exchange Module (1) ~ (3) A-6/11 ~ A-8/11 Inverter/ Module Exchange T-Con (1) ~ (2) A-9/11 ~ A-10/11 Exchange Power Board(PSU) A-11/11 Continue to the next page Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 42 Remote control operation checking method D. Function error Motion Remote operation checking method How to use the Service remote control A15-A17 E. Etc Check items after Main B/D replacement Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 43 Check the voltage of R7632 (Blue) while turning on TV power If the voltage is low, Vx1 is locked.(OK) Low (0V) : Normal, High (3.3V) : Burnt Detect Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 44 All settings  General  Programmes  Programme Tuning & settings  Manual Tuning When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 45 Revised Version checking method Content date 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 46 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 47 Revised Content connection diagram date As the part connecting to the external input, check the screen condition by signal Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 48 A. Video error_Color 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 49 Screen darkness to disconnection of the FFC cable pin. G color transient due to poor FFC cable CABLE G Color Excessive connection A - 1/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 50 LVDS cable connection problem CABLE Color spread LVDS cable connection problem Due to foreign substance withi nLVDS CABLE Screen stop cable PIN A - 2/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 51 Main IC problem Main Dark picture Dark left-side screen Top/bottom screen part Main Broken picture Picture problem due to tuner Inner side quality problem A - 3/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 52 Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen A - 4/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 53 Screen picture spread problem Screen problem No problem at the initial stage. Right-side Main During Heat run, right-side picture picture problem problem A - 5/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 54 BLU internal foreign matter inflow MODULE Internal matter 6 block image broken MODULE Image broken MODULE Image broken Screen sync signal broken A - 6/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 55 BLU Vertical spreading on cube screen in no MODULE Vertical smear signal MODULE Over color Screen contour part brightly Over color A - 7/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 56 Center of the screen 1 block dark MODULE Screen darkness MODULE Vertical bar Center Vertical Bar Darkness at the MODULE bottom of the MODULE internal BLU breakage screen A - 8/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 57 T-Con is defective and the picture below T-CON image broken the screen is broken A - 9/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 58 The entire screen is dark and bit noise T-CON Image Broken occurs The entire screen is dark and bit noise T-CON Image Broken occurs A - 10/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 59 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 11/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 60 Established B. Power error _No power symptom date Revised Content Check front Power Indicator date ST-BY condition: On or Off Power ON condition: Turn Off Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 61 6. T-CON 12V Check : P202 - SET On : above 12V - SET St-by : 0V AC INPUT All condition meets, Power Board OK. Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 62 1. Press the IN-START button of the remote control for adjustment. 2. Press the navigation key(Right) 3 2 Page times, entry into SVC menu 2 page. Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 63: 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 64 3. Connect the tester P5400 to the speaker terminal and if you hear the ‘Chik~ Chik~’ sound when you touch the GND and output terminal, the speaker is normal. Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 65 2. Check the Main standby 3.5V on the terminal. (③) 3. AS checking the Pre-Amp(IR LED light) , the power is in ON condition, an Analog Tester needle should move slowly, otherwise, it’s defective. Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 66 Checking order to check motion remote/wifi KEY2 Checking order WOV_PDMO_DATAIN WOV_PDM_CLKOUT 1.Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2.Check the Main 3.5V on the terminal 1 pin Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 67 Revised Content How to use the Service remote control date 1. How to access the remote control 1 page Press the button 3times. 2 page Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 68 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 69 Connects to external input 1,2,3 COMP1,2 (Added function) Connects to Component 1,2 HDMI1,2,3,4 Connects to HDMI 1,2,3,4 (Add function) DVI (Add function) Connects to DVI Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 70 If the TV Screen is a white pattern and the pop-up window does not appear when connecting USB. Press the “BACK" or “EXIT” on the remote controller for 3 seconds to switch to White noise screen. Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 71 If the result comes out ‘NG’ for each part, make sure to check the connector check again between the part and the cable is properly connected. (Check if the cable connection is normal) 1 / 1 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 72 (Some models launched before 2017 may have 5V / 3.5V) 3. If the result comes out ’NG’, replace Power Board ● Note. 1 / 4 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 73 2. Check the output voltage of 20VS and 12VM 3. If the result comes out ’NG, check the voltage of PWR_ON ● Note. 2 / 4 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 74 3. If the result comes out ’NG, replace Main Board. If it comes out ‘OK’, replace Power B/D 4. The normal power supply from MAIN to POWER is 3V or higher ● PWR_ON Note. 3 / 4 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 75 2. If the result comes out ’NG, replace Power B/D. If it comes out ‘OK’, check if Main B/D and Module operate normally. Note. 4 / 4 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 76 Connect the T-Con ~ motherboard FFC cable to the Jig A jig for sending test patterns ※ SVC Part P/No : RAD33749101 Parts connecting Cable Appendix. 1 / 1 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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