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LG OLED77B3 Series User Manual

LG OLED77B3 Series
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P/NO : MFL71991232 (2301-REV00)
CHASSIS : E*32B
MODEL : OLED77B3***
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
OLED TV
SERVICE MANUAL
Copyright © 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
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.
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LG OLED77B3 Series Specifications

General IconGeneral
Screen Size77 inches
Display TypeOLED
Refresh Rate120Hz
Processorα7 Gen6 AI Processor 4K
Operating SystemwebOS
HDMI Ports4
HDMI Version2.1
USB Ports3
BluetoothYes
Wi-FiYes
EthernetYes
Voice AssistantsGoogle Assistant, Amazon Alexa
VRRYes
ALLMYes
eARCYes
Audio Output40W
Resolution3840 x 2160 (4K)
HDR SupportDolby Vision, HDR10, HLG

Summary

SAFETY PRECAUTIONS

General Guidance

General advice for safe servicing practices.

Leakage Current Cold Check

Procedure for checking AC leakage current when the chassis is not grounded.

Leakage Current Hot Check

Procedure for checking AC leakage current with the chassis connected to AC.

SERVICING PRECAUTIONS

General Servicing Precautions

Essential precautions for general servicing procedures.

Electrostatically Sensitive (ES) Devices

Guidelines for handling components sensitive to static electricity.

General Soldering Guidelines

Best practices for soldering electronic components and circuit boards.

SPECIFICATION

Application Range

Defines the scope of application for this service manual.

Test Requirements

Specifies conditions and requirements for product testing.

Test Methods

Outlines the methods used for testing product performance and safety.

Model General Specifications

General specifications applicable to various models and regions.

Market

Identifies different market regions for the TV.

Broadcasting System

Lists broadcasting systems supported by region.

Program Coverage

Details the range of TV programs supported by different regions.

Receiving System

Describes the digital and analog receiving systems for various regions.

Interface Specifications

Details various input/output ports and their capabilities.

EXTERNAL INPUT SUPPORT

HDMI Input (DTV)

Lists supported HDMI input formats for Digital TV.

HDMI Input (PC)

Lists supported HDMI input formats for PC connection.

SOFTWARE UPDATE

USB Download

Procedure for updating TV software via USB.

NSU Download (Network Software Update)

Procedure for updating TV software via Network, including Auto Update On.

BLOCK DIAGRAM

EXPLODED VIEW

WIRING DIAGRAM

ASSEMBLY / DISASSEMBLY GUIDE

Disassembly Guide

Step-by-step instructions for disassembling the TV.

STANDARD REPAIR PROCESS

A. Video error (No video/ Normal audio)

Troubleshooting steps for no video or normal audio issues.

A. Video error (No video/ No audio)

Troubleshooting steps for no video and no audio issues.

A. Video error (Picture broken/ Freezing)

Troubleshooting steps for picture breaking or freezing issues.

A. Video error (Color error)

Troubleshooting steps for color-related video errors.

A. Video error (Vertical/Horizontal bar, residual image, light spot, external device color error)

Troubleshooting steps for bars, image retention, and external device color issues.

B. Power error (No power)

Troubleshooting steps for the TV not turning on.

B. Power error (Off when on, off while viewing, power auto on/off)

Troubleshooting steps for unexpected power off or auto power cycling.

C. Audio error (No audio/Normal video)

Troubleshooting steps for no audio with normal video.

C. Audio error (Wrecked audio/ discontinuation/noise)

Troubleshooting steps for distorted, discontinuous, or noisy audio.

D. Function error (Remote control & Local switch checking)

Troubleshooting for remote control and local button functionality.

D. Function error (MR23 operating checking)

Troubleshooting steps specific to the MR23 Magic Remote control.

D. Function error (Wifi operating checking)

Troubleshooting steps for Wi-Fi connectivity and operation issues.

D. Function error (External device recognition error)

Troubleshooting steps for issues recognizing external devices.

E. Noise (Circuit noise, mechanical noise)

Diagnosing and resolving circuit or mechanical noise issues.

F. Exterior defect (Exterior defect)

Steps for addressing physical damage or defects to the TV's exterior.

STANDARD REPAIR PROCESS DETAIL TECHNICAL MANUAL

A. Video error_No video/Normal audio

Detailed steps for diagnosing no video/normal audio issues.

A. Video error_Video error, video lag/stop

Detailed steps for video errors, lag, or stop issues.

A. Video error_Video error, video lag/stop

OLED TV version checking method for video issues.

A. Video error_Video error, video lag/stop

TUNER checking part and related troubleshooting steps.

A. Video error_Vertical/Horizontal bar, residual image, light spot

OLED TV connection diagram for specific video issues.

A. Video error_Color error

Check Link Cable (Vx1) reconnection condition for color errors.

APPENDIX: IMAGE ERROR SYMPTOMS

APPENDIX: MAIN SYMPTOMS

APPENDIX: MODULE SYMPTOMS

APPENDIX : EXCHANGE POWER BOARD (PSU)

STANDARD REPAIR PROCESS DETAIL TECHNICAL MANUAL

B. Power error_No power

Checking the front power indicator for no power issues.

B. Power error_No power

Checking power input voltage and ST-BY voltage.

B. Power error_Off (when on, whiling viewing)

POWER OFF MODE checking method.

STANDARD REPAIR PROCESS DETAIL TECHNICAL MANUAL

C. Audio error_No audio/Normal video

Checking method in menu for no audio.

C. Audio error_No audio/Normal video

Voltage and speaker checking method for no audio.

STANDARD REPAIR PROCESS DETAIL TECHNICAL MANUAL

D. Function error (Remote control operation checking method)

Checking IR cable condition and standby power for remote control.

STANDARD REPAIR PROCESS DETAIL TECHNICAL MANUAL

D. Function error (Motion Remote operation checking method)

Checking BT/Wifi cable and 3.5V power for motion remote.

STANDARD REPAIR PROCESS DETAIL TECHNICAL MANUAL

E. Etc (How to use the Service remote control)

How to access the service menu and check TV information.

STANDARD REPAIR PROCESS DETAIL TECHNICAL MANUAL

E. Etc (How to use the Service remote control)

Remote control part definition and function mapping.

STANDARD REPAIR PROCESS DETAIL TECHNICAL MANUAL

E. Etc (How to use the Service remote control)

Explaining the function of each button on the service remote control.

STANDARD REPAIR PROCESS DETAIL TECHNICAL MANUAL

E. Etc (Check items afer Main B/D)

How to change tool option data and troubleshoot white screen issues.

GUIDE TO INSPECTING PARTS FOR SYMPTOMS OF NO POWER / NO SCREEN

NOTE 1. HOW TO MEASURE ST-BY

NOTE 2. HOW TO MEASURE THE OUTPUT VOLTAGE OF POWER B/D

NOTE 3. HOW TO MEASURE PWR ON

NOTE 4. HOW TO MEASURE POWER B/D MODULE

APPENDIX. HOW TO CHECK FOR OLED TV MODULE DEFECTS

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