LG OLED77G1PT Series Service Manual
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LG OLED77G1PT Series Service Manual

LG OLED77G1PT Series Service Manual

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OLED TV
SERVICE MANUAL
CHASSIS : EB11G / ED11G
MODEL : OLED77G1PT* / PVA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71796423 (2101-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 © 2021 LG Electronics Inc. All rights reserved. Only training and service purposes.
OLED77G1*LA

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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 SPECIFICATION ..................6 SOFTWARE UPDATE ................10 BLOCK DIAGRAM ................. 12 EXPLODED VIEW .................. 13 ASSEMBLY / DISASSEMBLY GUIDE ............ 14 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

    3. Test method (1) Performance: LGE TV test method followed (2) Demanded other specification - Safety : CE, IEC specification - EMC : CE, IEC specification - 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 (1EA) STP cable PCMCIA Card slot (1EA) PCMCIA Slot only EU/CIS - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 107.89 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 - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 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 - 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 1. Open the Wall Mount Assembly’s Stoppers, Separates the TV from the Wall Mount Assembly. Total Screw No. : 85ea 2. After removing 3 screws, Separate Cover, Small Rear from Back cover. Screw : 3ea - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 Back Cover Outer. Separate R/L by removing 3 screws of back cover outer which is separated from inner. Screw : 23ea Flanges : 4ea Screw : 3ea - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 5. Remove all sort of Cables( ) and Detach the Wiring tapes( 6. Disassemble the bracket after removing 3 screws of EMS bracket. Screw : 3ea - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 7. Disassemble the Speakers from the Module Cover. 8. After Removing 20 Screws of the Power Board and Main Board, Disassemble those Boards from the Module Cover. Screw : 20ea - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 9. After Removing 2 Screws of IR Assembly, Separate the IR Assembly. Screw : 2ea 10. Remove Plate after Removing 15 Screws of Main Plate, Wall Mount Supporter, and Stand Supporter. Screw : 15ea - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 (1) One person B/C Handling Guide - Cover, Small Rear part center gripping (2) Two people Handling Guide - 2 People Grasp : Long side shoulder width 600~800mm - 19 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 20: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 21 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 22 ☞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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 23 ☞A18 Check various Check and No Video/ Normal voltages of Power replace No audio voltage? Board (12V…) MAIN B/D Replace Power Board and repair parts Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 24 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 25 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 26 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 27: Power Error

    Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Check Main ST-BY Normal Close 3.5V voltage? ☞A18 Replace Power B/D Replace Power B/D Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 28 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 29 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 30 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 31 (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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 32 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 33 5sec RF Receiver ver Close is “00.00”? Replace MR21 Close Replace MR21 * If you conduct the loop at 3times, change the MR21. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 34 Voltage? INSTART menu 1pin Main B/D ☞A24 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value Close is “NG”? Change the Wifi assy Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 35 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 36 “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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 37 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 38 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 39 Motion Remote operation checking method Verifying the activation of the voice recognition function How to use the Service remote control A16-A18 E. Etc Check items after Main B/D replacement Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 40 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. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 41  All settings  Programmes Programme Tuning & settings  Manual Tuning When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 42 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 © 2021 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 44 Revised Content Connection diagram date As the part connecting to the external input, check the screen condition by signal. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 45 A. Video error_Color error symptom date Revised Content Check Link Cable(VX1/EPI) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2021 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 - 1/11 Copyright © 2021 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 - 2/11 Copyright © 2021 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 - 3/11 Copyright © 2021 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 - 4/11 Copyright © 2021 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 - 5/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 51 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 52 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 53 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 54 T-Con is defective and the picture below T-CON image broken the screen is broken A - 9/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 55 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 56 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 11/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 57 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 58 5. T-CON 23V Check : P204 - SET On : above 23V - SET St-by : 0V AC INPUT All condition meets, Power Board OK. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 59 POWER OFF MODE checking method date Entry method 1. Press the IN-START button of the remote control for adjustment. 2. Check the entry into adjustment item 3. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 60: 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 61 3.Connect the tester P5902 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 62 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 63 Checking order to check motion remote/wifi WOV-CLKOUT Checking order 1. Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2. Check the Main 3.5V on the terminal 1 pin. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 64 Verifying the activation of the voice recognition function date 1. Menu > General > AI Service 2. Voice Recognition Help and Settings 3. Setting 4. Use Hands-free Voice Control Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 65 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 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 66 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 67 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 68 - 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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