LG OLED77G3 Series Service Manual

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OLED TV

SERVICE MANUAL

CHASSIS : E*31H

MODEL : OLED77G3***

CAUTION

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL71989802 (2301-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.

Summary of Contents for LG OLED77G3 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 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 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 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 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 17 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. - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 18 5. Remove the 17 indicator screws. 6. Before opening the back cover, read the 4 positions of the holder for the back cover type. - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 19 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 - 19 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 20 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 - 20 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 21 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 - 21 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 22 Check that the back cover is not raised because the holder is not assembled. Click Click Holer 4 ea Click Click 3. Tighten 17 screws. - 22 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 23 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. - 23 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 26 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 27 ☞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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 28 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 29 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 30 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 31 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 32 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 33 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 34 OLED module check and replacement( BDP etc. ) Check the T-con and main connection cable Check Fan / heat sink fastening condition Normal Code - N/A Normal Code Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 35 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 36 (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 37 (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 38 5sec RF Receiver ver Close is “00.00”? Replace MR23. Close Replace MR23. * If you conduct the loop at 3 times, change the MR23. Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 39 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 40 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 41 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 42 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 43 “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 44 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 45 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 46 How to use the Service remote control A18-A20 E. Etc Check items after Main B/D replacement F. Wi-Fi / RF How to Wi-Fi / RF checking method Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 47 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 48 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 49 Channel Selection When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) When the Signal Strength/ Signal Quality is low, check antenna cable. Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 50 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 51 2. After measuring each voltage from power supply, finally replace the MAIN BOARD. 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 52 Revised Revised Content Content Connection diagram TV connection diagram date 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 53 A. Video error_ Color error 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 54 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 55 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 56 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 57 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 58 Screen picture spread problem Screen problem Right-side No problem at the initial stage. Main picture problem During Heat run, right-side picture problem A - 5/10 Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 59 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 60 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 61 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 62 (In this case, it can’t be repared. Replace Module) Picture Mura Module Mura (In this case, it can’t be repared. Replace Module) A - 9/10 Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 64 Revised Revised Check front display LED Content Content Check front display Logo date 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 65 Power To Module Power To Module (P252) (P251) 24VD 24VD 24VD 24VD SK100 24VD 24VD 24VD 24VD 24VD 24VD 24VD 24VD 24VD 24VD 24VD 24VD Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 66 1 Page Entry method 1. Press the IN-START button of the remote control for adjustment. 2. Check the entry into adjustment item 3. 2 Page Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 67 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 68 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 69 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 70 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 71 Motion Remote operation checking method date date date 1. Menu > General > AI Service 2. Voice Recognition Settings Agree Later 3. User Agreements 4.Activate Use Hand-free Voice Control Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 72 Motion : YES is displayed on the Screen. Press Instart Key On the instart screen, check the motion check item OK Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 73 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 © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 74 Standard Repair Process Detail Technical Manual Established Error symptom E. Etc date Revised Content How to use the service remote control date How to access the remote control Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 75 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 76 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 77 If the TV screen is a white pattern, the pop-up window does not appear When connecting USB, Press the “BACK" or “EXIT” key on the remote control for 3 seconds to switch to the White Noise screen. Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 78 Standard Repair Process Detail Technical Manual Error Established F. Wi-Fi / RF symptom date Revised Content How to Wi-Fi / RF checking method date Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 79 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 80 (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 81 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 82 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 83 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 84 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 85 - No need to separate Main B/D from Module to measure the voltage of the back part of Main B/D, <Back part of PCB> Appendix. 1 / 1 Copyright © 2023 LG Electronics Inc. All rights reserved. Only for training and service purposes.

LG OLED77G3 Series Service Manual

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