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LG 75UR8050PSB Service Manual
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LG 75UR8050PSB Service Manual

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LED TV
LED TV
SERVICE MANUAL
SERVICE MANUAL
CHASSIS : UB35D
MODEL : 75UR8050PSB
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL72006806 (2302-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 75UR8050PSB

  • 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 .................. 11 EXPLODED VIEW .................. 12 WIRING DIAGRAM ................13 ASSEMBLY / DISASSEMBLY GUIDE ........... 14 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only for 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 for training and service purposes.

  • Page 4: Servicing Precautions

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

  • Page 6: Specification

    * Some models do not support HDMI4 USB Input My Media(Movie/Photo/Music List) or SVC SPDIF out Optical Audio out Ethernet Connect AV Input CVBS, Audio LR Only for INDIA - 6 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 7 23.98 1188 7680*4320 1188 7680*4320 1188 7680*4320 131.87 29.97 1188 8K Model Only. 7680*4320 1188 7680*4320 2376 7680*4320 263.74 59.94 2376 7680*4320 2376 - 7 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 8 UHD DeepColor is On (UHD, 8K 120Hz models only), 2560*1440 182.99 119.99 497.7 Support only when UHD Deep- Color is On - 8 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 9 (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 - 9 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 10 “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 - 10 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 11: Block Diagram

    BLOCK DIAGRAM - 11 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 12: 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. - 12 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 13: Wiring Diagram

    WIRING DIAGRAM Power Board Main Board SPEAKER SPEAKER WIFI - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 Back Cover Curling shape Cover Bottom+ Holder Back Cover Assembly = Module (Holder) + Back Cover (Curling) 425mm 425mm 225mm 225mm Screw 18EA Holder 6EA - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 Stripper Stripper <Step1> <Step2> (5) Two people grasp Back Cover and remove Back Cover. - Grasp position : 600~800mm 600~800mm 600~800mm <Step2> <Step1> - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 → 2 People Grasp : Long side shoulder width 600~800mm → 2 people set up : 4-corner Handling ▪ Two people Handling Guide - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 (2) Confirm Latch Assemble part (If Latch is not assemble, Gap and lifting are made.) Gap between B/C and Module Direction of PUSH - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 [Assemble Guide] 1. Attach the INSULATOR. 2. Assemble/Fix the SUPPORTER + MODULE. Description LCD, Module Insulator Stand Supporter Screw - 18 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 Speaker Rubber 4. Assemble/Fix the POWER / MAIN PCB + MODULE. Description Power Supply Assy Chassis Assy Screw - 19 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 7. When Attach the tape for fixing Harness at Module, Rub the tape 2~3 times for adhering totally. Description Tape (Insert SPK HARNESS into the hook only at the marked “ “ part) - 20 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 (Press the edge of mark rubbing it using palm to insert holder) 414mm 253mm 260mm 120mm Description Cover Assy Rear Top Screw Screw Screw - 21 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 10. Assemble COVER on the REAR COVER 11. Fix the POWER CORD + BACK COVER with SCREW 12. Attach the TAPE Description Power Cord Assy Screw Tape - 22 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 - Disassemble the source PCB from the guide. (Remove bridge FFC tape 2ea after disassembly.) (2) Disassemble of Guide panel - Disassemble the Screws. (UP/RIGHT/LEFT Total : 14ea ) - 23 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 * Fix the S-PCB to Panel(use the tape). 2. The Guide of Panel assy (with Guide pael) (1) Disassemble of Guide panel *Disassemble Hooks with flat stick. - 24 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 (2) Removal of Sheets and Diffuser Plate SET Front Direction Left down Chamfer Diffuser Plate 1ea Diffuser Plate: Chamfer Sheet: Chamfer Sheet 1ea - 25 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 1) Attach the double tape to the round hole on Cover Bottom embo. 2) Remove the protect film of Double Tape with taking off the handler. - 26 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 * Assemble the reflector sheet bellow the lens with your fingers. * In the case of corner and center, place the side marked UP on top. - 27 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 * There is chamfer in the lower left corner of the DP and sheet. (4) Assemble the Panel and Guide Panel. * Assemble the upper left/right first and assemble the bottom left/right. - 28 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 29 (7) Assemble the case top screws. * Bottom side screws 9ea. * When the left and right ends, hold case top by hand. - 29 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 30 - Guide Panel Screws (Up 6ea / L 4ea / R 4ea) - Cover Shield Screws (Left 3ea / Center 1ea / Right 3ea). - 30 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 31: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE...
  • Page 32 Contents of Standard Repair Process Error symptom (High category) Error symptom (Mid category) Page Remarks No video/Normal audio No video/No audio Picture broken/ Freezing A. Video error Color error Vertical/Horizontal bar, residual image, light spot, external device color error No power Off when on, off while viewing, power auto on/off B.
  • Page 33 Standard Repair Process Established A. Video error Error date symptom No video/ Normal audio Revised date 1/17 First of all, Check whether all of cables between board is inserted properly or not. (Main B/D↔ Power B/D, Each Cable for Panel, Speaker Cable, IR B/D Cable,,,) ☞A1 ☞A9 No video...
  • Page 34 Standard Repair Process Established A. Video error Error date symptom No video/ No audio Revised date 2/17 ☞A9 Check various Check and No Video/ Normal voltages of Power replace No audio voltage? Board (13.2V…) MAIN B/D Replace Power Board and repair parts...
  • Page 35 Standard Repair Process Established A. Video error Error date symptom Picture broken/ Freezing Revised date 3/17 . By using Digital signal level meter ☞ A3 . By using Diagnostics menu on OSD ( Advanced→ Channels→ Channel Tuning→ Manual Tuning → Check the Signal ) Check RF Signal level - Signal strength (Normal : over 50%) - Signal Quality (Normal: over 50%)
  • Page 36 Standard Repair Process Established A. Video error Error date symptom Color error Revised date 4/17 ☞ A7 ※ Check and ☞A6 replace Link Check color by input Cable Color Color Color (EPI or Vx1 Replace module -External Input Replace Main B/D error? error? error?
  • Page 37 Standard Repair Process Established A. Video error Error date symptom Vertical / Horizontal bar, residual image, Revised date 5/17 light spot, external device color error Vertical/Horizontal bar, residual image, light spot Replace Module ☞A6 ☞ A7 Check color condition Check external Check and by input Screen...

  • Page 38: Power Error

    Standard Repair Process Established B. Power error Error date symptom No power Revised date 6/17 ☞A8 ☞A9 DC Power on Check front Power Normal Check Power Replace by pressing Power Key On ‘”High” Power Indicator Power B/D LED On? operation? On Remote control .
  • Page 39 Standard Repair Process Established B. Power error Error date symptom Off when on, off while viewing, power auto on/off Revised date 7/17 Check Power outlet ☞A11 Check Power Off Check A/C cord Error? Replace Main B/D Normal? Mode Abnormal Check for all 2- phase Replace Power B/D power out POLLING...
  • Page 40 Standard Repair Process Established B. Power error Error date symptom Off when on, off while viewing, power auto on/off Revised date 8/17 * Please refer to the all cases which can be displayed on power off mode. Power off history Contents Explanation Action Details...
  • Page 41 Standard Repair Process Established C. Audio error Error date symptom No audio/ Normal video Revised date 9/17 ☞A12 ☞A13+A9 Check user No audio Check audio Normal menu > Screen normal 13.2V of Power voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Speaker Disconnection Replace MAIN Board...
  • Page 42 Standard Repair Process Established C. Audio error Error date symptom Wrecked audio/ discontinuation/noise Revised date 10/17 → abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio ☞A13+A9 Wrecked audio/ Check and replace Check audio Discontinuation/ speaker and B+ Voltage (13.2V) Noise for connector...

  • Page 43: Function Error

    Standard Repair Process Established D. Function error Error date symptom Remote control & Local switch checking Revised date 11/17 1. Remote control(R/C) operating error Replace Main B/D ☞A14 ☞A14 ☞A14 Check & Repair Check R/C itself Normal Normal Check B+3.5V Normal Check IR Normal...
  • Page 44 Standard Repair Process Established D. Function error Error date symptom Magic Remote control operating checking Revised date 12/17 2. Magic Remote control operating error ☞A4 Turn off/on the Check the RF Receiver Check MR23 Normal Press the Is show ok set and press ver is “00.00”? operating?
  • Page 45 Standard Repair Process Established D. Function error Error date symptom WiFi operating checking Revised date 13/17 3. WiFi operating error ☞A4 ☞A15 Wi-Fi Mac Check the WiFi wafer Replace Check the Normal value +3.5V_WiFi Voltage? INSTART menu Main B/D is “NG”? ☞A15 Close Check &...
  • Page 46 Standard Repair Process Established D. Function error Error date symptom External device recognition error Revised date 14/17 Check technical Check External Input information Signal Technical input Replace Main B/D And Component input? - Fix information information? Recognition error signal - S/W Version HDMI/ DVI, Optical Check and fix...
  • Page 47 Standard Repair Process Established D. Function error Error date symptom Voice Recognition Function Error Revised date 15/17 ☞A15 Check Voice Check Funcion Network Sub Ass’y Recognition Function Check network Is On In Connected? menu? in menu Cable Make the Connect network function ‘on’...
  • Page 48 Standard Repair Process Established E. Noise Error date symptom Circuit noise, mechanical noise Revised date 16/17 Identify Circuit Check location Replace PSU of noise nose type noise Mechanical Check location of noise noise ※ When the nose is severe, replace the module ※...
  • Page 49 Standard Repair Process Established F. Exterior defect Error date symptom Exterior defect Revised date 17/17 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent...
  • Page 50 Contents of Standard Repair Process Detail Technical Manual Error symptom Content Page Remarks Check LCD back light with naked eye A. Video error_ No video/Normal audio Check White Balance value TUNER input signal strength checking method A. Video error_ video error /Video Version checking method lag/stop Tuner Checking Part...
  • Page 51 Contents of Standard Repair Process Detail Technical Manual Continued from previous page Error symptom Content Page Remarks Check front display LED B. Power error_ No power Check power input Voltage & ST-BY 7.8V B. Power error_Off when on, off POWER OFF MODE checking method while viewing Checking method in menu when there is no audio...
  • Page 52 Standard Repair Process Detail Technical Manual Error Established error_No A. Video video/Normal audio symptom date Revised Content Check LCD back light with naked eye date 75UR80/81 After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations.
  • Page 53 Standard Repair Process Detail Technical Manual Error Established error_No A. Video video/Normal audio symptom date Revised Content Check White Balance value date <ALL MODELS> Entry method 1. Press the ADJ button on the remote control for adjustment. 2. Enter into White Balance. 3.
  • Page 54 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised Content TUNER input signal strength checking method date <ALL MODELS> All Setting  General  Programmes  Programme Tuning & Settings  Manual Tuning When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.)
  • Page 55 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised Content Version checking method date 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment...
  • Page 56 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised TUNER checking part Content date Checking method: 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2.
  • Page 57 Standard Repair Process Detail Technical Manual Error A. Video error _Vertical/Horizontal bar, Established symptom residual image, light spot date Revised Content connection diagram date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal...
  • Page 58 Standard Repair Process Detail Technical Manual Error Established A. Video error_Color error symptom date Revised Content Check Link Cable(Vx1/EPI/CEDS) reconnection condition date 75UR80/81 Check the contact condition of the Link Cable, especially dust or mis insertion.
  • Page 59 Appendix. Examples of Symptoms(Image error) Check for poor cable contact Symptom Item Cause Symptom Image Name Poor broken pin of FFC cable CABLE Color smear Color is Excessive due to FFC Cable CABLE R Color Excessive Contact. screen is dark due to poor contact due to CABLE Screen darkness disconnection of the FFC cable pin.
  • Page 60 Appendix. Examples of Symptoms(Image error) Check for poor cable contact Symptom Item Cause Symptom Image Name CABLE Color spread FFC connection problem CABLE Color spread FFC connection problem CABLE Color spread FFC connection problem Due to foreign substance within CABLE Screen stop FFC PIN A - 2/11...
  • Page 61 Appendix. Examples of Symptoms(Main) Check parts by symptom Symptom Item Cause Symptom Image Name Main Screen noise Bit noise from horizontal screen Broken screen due to Main Screen noise Main IC problem Main Dark picture Dark left-side screen Top/bottom screen part Main Broken picture Picture problem due to tuner...
  • Page 62 Appendix. Examples of Symptoms(Main) Check parts by symptom Symptom Item Cause Symptom Image Name Main Broken screen Broken screen in a horizontal manner Main Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen A - 4/11...
  • Page 63 No problem at the initial stage, Main Broken picture G-color spread after 10 minutes Right-side Main Screen Right-side screen problem problem LG logo Main Screen picture spread problem Screen problem No problem at the initial stage. Right-side picture Main During Heat run, right-side picture problem...
  • Page 64 Appendix. Examples of Symptoms(Module) Check parts by symptom Symptom Item Cause Symptom Image Name Isometric Isometric horizontal bars occur MODULE Horizontal Bar throughout the screen BLU internal foreign matter inflow MODULE Internal matter 6 block image broken MODULE Image broken MODULE Image broken Screen sync signal broken...
  • Page 65 Appendix. Examples of Symptoms(Module) Check parts by symptom Symptom Item Cause Symptom Image Name Internal damage and image breakage due MODULE Image broken to external impact Bend on the Bending due to lateral external impact MODULE screen and internal bending of BLU Vertical spreading on cube screen in no MODULE Vertical smear...
  • Page 66 Appendix. Examples of Symptoms(Module) Check parts by symptom Symptom Item Cause Symptom Image Name MODULE Vertical bar Center Vertical Bar 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...
  • Page 67 Appendix. Examples of Symptoms(Only if using T-con Board) Check parts by symptom Symptom Item Cause Symptom Image Name screen lower T-Con is defective and the picture below T-CON image broken the screen is broken screen lower T-Con is defective and the picture below T-CON image broken the screen is broken...
  • Page 68 Appendix. Examples of Symptoms(Only if using T-con Board) Check parts by symptom Symptom Item Cause Symptom Image Name T-CON Wafer Locking The strength is T-CON Image Broken weak and cable contact failure occurs Darkness at the Initial normal operation, T-CON top of the screen upper darkness during heat run The entire screen is dark and bit noise...
  • Page 69 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 11/11...
  • Page 70 Standard Repair Process Detail Technical Manual Error 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...
  • Page 71 Standard Repair Process Detail Technical Manual Error Established B. Power error _No power symptom date Revised Content Check power input voltage and ST-BY 7.8V date Power P/N, Name SET Model 75UR80/81 Series EAY65895542, LGP75NT-21U1 Power Check Sequence 1. AC input Check : SK100 (100~240Vac) 2.
  • Page 72 Standard Repair Process Detail Technical Manual Error Established B. Power error _Off when on, off whiling viewing symptom date Revised Content POWER OFF MODE checking method date <ALL MODELS> Entry method 1. Press the IN-START button of the remote control for adjustment. 2.

  • Page 73: Checking Method

    Standard Repair Process Detail Technical Manual Error Established C. Audio error_No audio/Normal video symptom date Revised Content Checking method in menu when there is no audio date <ALL MODELS> Checking method 1. Press the Setting button on the remote control. 2.
  • Page 74 Standard Repair Process Detail Technical Manual Error Established C. Audio error_No audio/Normal video symptom date Voltage and speaker checking method Revised Content when there is no audio date ② ① ③ SPK_R-FT SPK_R+FT Checking order when there is no audio SPK_L-FT SPK_L+FT 1.
  • Page 75 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content Remote control operation checking method date Pin name ① WIFI_DM IR & EYE Sensor WIFI_DP WOL/WIFI_ON ③ WIFI_SUSPEND/RESUEM COMBO_RESET BT_WAKEUP_HOST EYE_SDA EYE_SCL LED_R ② Checking order to check remote control KEY2 MIC_DATA Checking order...
  • Page 76 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content Remote control operation checking method date Pin name WIFI_DM ① Wifi & BT Front WIFI_DP WOL/WIFI_ON ③ WIFI_SUSPEND/RESUEM COMBO_RESET BT_WAKEUP_HOST Wifi & BT Rear EYE_SDA EYE_SCL LED_R ②...
  • Page 77 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content How to use the Service remote control date 1. How to access the remote control 1 page 2 page...
  • Page 78 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content How to use the Service remote control date 2. Remote control part definition POWER Power On/Off [ETC] Each time pressing the KEY button, Mode gets changed to ETC and P-ONLY each time ETC (Added Function) All KEY function [PIP PR-][PIP PR+][SWAP] [PIP INPUT][DVI] KEY Function...
  • Page 79 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content How to use the Service remote control date B-TOOTH Connected to Blue-Tooth (Added function) Model Nam ex) 42PG60D-NA Current Model Name S/W Version ex) V03.11.0 Current S/W version IN-START MICOM Version ex) V3.05.0 current Mi-Com version UTT ex) User TV total usage time POWER OFF STATUS ex) Shows power-off status...
  • Page 80 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content Check items after Main B/D replacement date Check items after Main B/D(Model Number D/L, White Balance) 1. Press the Service remote control instart Key. No.7 Select Model Number D/L - Key in the model name and serial number after checking the ID label on the back cover.
  • Page 81 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content Adjustment Test pattern - ADJ Key date P-ONLY  HDMI HOT(Yellow button)  CH ‘+’ or ‘-’ You can view 11 types of patterns using the ADJ Key Checking item : 1.
  • Page 82 Standard Repair Process Detail Technical Manual Error Established F. WIFI /RF symptom date Revised Content How to Check Wifi / RF date WiFi / Magic Search 2 page Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 83 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 84 (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 85 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 86 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 87 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 88 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.
  • Page 89 VDD-EPI / 2 HVDD HVDD uses half the voltage of VDD-EPI (7.7V~8.1V) VDD-EPI 16.2V ~ 16.8V VGH1 32V ~ 36V VCC1.8 Appendix. 1 / 1 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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