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LG OLED77G2 A Series Service Manual
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LG OLED77G2 A Series Service Manual

LG OLED77G2 A Series Service Manual

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OLED TV
SERVICE MANUAL
CHASSIS : E*21H
MODEL : OLED77G2**A
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71888123 (2202-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 © 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.

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Summary of Contents for LG OLED77G2 A 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 SPECIFICATION ..................6 SOFTWARE UPDATE ................12 BLOCK DIAGRAM ................. 14 EXPLODED VIEW .................. 15 ASSEMBLY / DISASSEMBLY GUIDE ............ 16 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 3 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 - 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 - 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 8 000~999 *BS8K is only for 8K Models. CS Digital 000~999 (4K Models do not support BS8K Digital Channels.) BS4K/8K Digital 001~499 CS4K Digital 500~999 - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 *Only 42/48C2 model & Japan all model 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 - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 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 3. Remove the stand by loosening the 4 screws for assembling the stand and pulling out the power cable through the hole in the center of the stand. - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 5. Remove the 17 indicator screws. 6. Before opening the back cover, read the 4 positions of the holder for the back cover type. - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 8. Using the first Plastic scraper, separate the left/right holder and lift it with both hands to prepare to separate the upper holder. Plastic scraper - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 9. After separating the side holder, to separate the upper holder 2 places, hold the B/ Cover from both sides and lift it up slightly to separate it. * Back Cover Handling Guide - 19 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 After it is seated, check that the entire outer part of the back cover is not distorted, and if necessary, fine-tune the position. * Back Cover Handling Guide - 20 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 21 Check that the back cover is not raised because the holder is not assembled. Click Click OLED77G2 holder 4 places Click Click 3. Tighten 17 screws. - 21 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 5. Pull out the power cable through the hole in the center of the stand, mount the stand, and then fasten the 4 screws for assembly. 6. Assemble the stand cable cover. - 22 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 * Complete (5), (6) - 23 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 TROUBLE SHOOTING GUIDE Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 25 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 26 ☞A2 & A4 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 27 Revised date 2/18 ☞A9 Check and No Video/ Check Power Board Normal replace No audio 20V,12V output voltage? MAIN B/D Replace Power Board and repair parts Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 28 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 29 Replace Main B/D error cable normal Request repair for external device/cable Check external External HDMI device and Replace Main B/D device/Cable error cable normal Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 30 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 31 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 32 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 33 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 34 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 35 (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 36 (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 37 5sec RF Receiver ver Close is “00.00”? Replace MR22 Close Replace MR22 * If you conduct the loop at 3times, change the MR22. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 38 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 39 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 40 In the Menu activation Connection Connection Network Connection Activation Close Close Replace Cable Replace Connection Voice Recognition Main B/D Ass’y Close Cable Close Re-Connection Close Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 41 18pin Main B/D INSTART menu ☞A17 Close Check & Repair Motion cable connection ☞A16 Check Motion Sensor ☞A16 MOTION Close “NG”? Change Motion Sensor Module Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 42 “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 43 Revised date 18/18 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 44 Exchange Main Board (1) ~ (3) A-3/10 ~ A-5/10 <Appendix> Exchange Module (1) ~ (4) A-6/10 ~ A-9/10 Exchange Power Board(PSU) A-10/10 Continue to the next page Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 45: Function Error

    Check Voice Recognition Function activation Check Motion Sensor Operation A16-A17 How to use the Service remote control A18-A20 E. Etc Check items after Main B/D replacement Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 46 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 47 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 48 All settings  General  Programmes  Programme Tuning & settings  Manual Tuning 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 49 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 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 50 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 51 Revised Content 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 52 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 53 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 54 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 55 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 56 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 57 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 58 Image broken Bright spot occur due to panel defect MODULE Bright Spot Horizontal Line dim occur & MODULE Line Dim Vertical Noise occur A - 6/10 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 59 MODULE Horizontal multiple band noise band MODULE Line defect Vertical Line defect occur MODULE Module damage Module damage caused by the module A - 7/10 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 60 Source PCB Defect defect Panel defect MODULE Vertical band MODULE Green lighting Abnormal light emission MODULE Color step noise The difference in color A - 8/10 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 61 (In this case, it can’t be repared. Replace Module) Picture Mura (In this case, it can’t be repared. Module Mura Replace Module) A - 9/10 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 62 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 63: Led

    Established B. Power error _No power symptom date Revised Content Check front display LED 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 64 P252 Power To T-Con Power To Module (P202) (P251, P252) SK100 12VD 12VD 12VD 12VT 12VD 12VT 12VD 12VT 12VD 12VT 12VD 12VT 12VD 12VT Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 65 POWER OFF MODE checking method date <ALL MODELS> Entry method 1. Press the IN-START button of the remote control for adjustment. 2. Check the entry into adjustment item 3. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 66 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 67 3. Connect 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 68: Table Of Contents

    2. Check the Main standby 3.5V on the terminal. 3. AS checking the IR LED light, the power is 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 69: Wifi_Suspend/Resume

    Checking order to check motion remote/wifi WOV_PDM_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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 70 Check Voice Recognition Function activation date 1. All Settings > General > AI Serivice 2. Voice Recognition Settings 3. User Agreements 4. Activation of Voice Recognition Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 71 Motion : YES is displayed on the Screen. Press Instart key On the instart screen, check the motion check item OK Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 72 Checking order to check motion sensor Checking order 1. Check the cable connection between the main board and the IR PCBA. 2. Check Terminal no.18 Voltage => 3.5V Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 73 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 74 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 75 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 76 - 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.

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