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LG 55EG9A7V-ZB User Manual

LG 55EG9A7V-ZB
62 pages
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P/NO : MFL70179701 (1703-REV00)
CHASSIS : ED79A
MODEL : 55EG9A7V 55EG9A7V-ZB
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
OLED TV
SERVICE MANUAL
CONFIDENTIAL
Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
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LG 55EG9A7V-ZB Specifications

General IconGeneral
Screen Size55 inches
Display TypeOLED
Smart TVYes
Audio Output20W
HDMI Ports3
USB Ports2
Operating SystemwebOS
Resolution1920 x 1080
HDR SupportYes

Summary

SAFETY PRECAUTIONS

Important Safety Notices

Essential safety parts replacement and general servicing guidelines.

Leakage Current Checks

Procedures for cold and hot checks to measure AC leakage current.

SERVICING PRECAUTIONS

General Servicing Precautions

General guidelines for safe and proper servicing of the receiver.

Handling Sensitive Components

Precautions for ES devices and proper soldering techniques.

Component Replacement Procedures

Steps for replacing ICs, transistors, diodes, fuses, and resistors.

Circuit Board Foil Repair

Techniques for repairing damaged copper patterns on circuit boards.

PRODUCT SPECIFICATIONS

Application Range and Test Requirements

Defines the scope and conditions for TV specifications and testing.

Test Methods and Model Details

Outlines testing procedures, market specs, and supported satellites.

Broadcast Systems and Input Voltage

Details supported broadcast systems and required input voltage.

EXTERNAL INPUT FORMATS

2D Input Modes

Lists supported resolutions and timings for Component and HDMI DTV inputs.

HDMI Input (PC)

Details HDMI input signal formats for PC, including resolutions and timings.

3D Input Modes Overview

Overview of 3D modes for RF and automatic HDMI inputs.

Manual 3D HDMI Input Modes

Details manual 3D HDMI-PC input modes.

Manual 3D HDMI DTV Input Modes

Lists manual 3D HDMI-DTV input modes and resolutions.

SOFTWARE UPDATE PROCEDURES

USB Software Update

Step-by-step guide for updating TV software via a USB drive.

Network Service Update (NSU)

Process for updating TV software using the Network Service Update feature.

SYSTEM BLOCK DIAGRAMS

SOC and Tuner Interfaces

Diagram of the SOC architecture and Tuner/CI connections.

Video, Audio, and HDMI Interfaces

Shows connections for video, audio, and HDMI 1.4 ports.

Communication Interfaces

Diagrams for USB, Wi-Fi, M-Remote, UART, and I2C connections.

EXPLODED VIEW AND SAFETY

Exploded View Safety Notice

Safety warning regarding replacement parts identified in the exploded view.

DISASSEMBLY GUIDE

Rear Cover Removal Steps

Initial steps for disassembling the TV, starting with the rear cover.

Stand and Back Cover Removal

Procedures for removing the stand, back cover screws, and power cord bracket.

Main Back Cover Removal

Steps involved in removing the main back cover of the TV.

STANDARD REPAIR PROCESS

A. Video Error Troubleshooting

Diagnostic flows for various video-related issues.

B. Power Error Troubleshooting

Diagnostic steps for power-related malfunctions.

C. Audio Error Troubleshooting

Diagnostic procedures for audio problems.

D. Function Error Troubleshooting

Troubleshooting for functional errors like remote control or Wi-Fi.

E. Noise Troubleshooting

Steps for identifying and resolving circuit or mechanical noise.

DETAILED REPAIR PROCEDURES - VIDEO/AUDIO

Vx1 Lock and White Balance Checks

Procedures for checking Vx1 lock status and adjusting White Balance.

Signal Strength and Version Checks

Methods for checking tuner signal strength and software version.

Tuner and Input Connection Checks

Checks related to the Tuner component and external input connections.

Link Cable and Color Error Checks

Procedures for checking Link Cable reconnection and color error diagnosis.

APPENDIX: COMPONENT REPLACEMENT VISUALS

Main Board Replacement Examples

Visual examples of defects found on the Main Board.

Power Board and Module Replacement Examples

Visuals of defects for Power Board and Module replacement.

Module Replacement Examples (Part 2)

Additional visual examples of module defects.

DETAILED REPAIR PROCESS - POWER/AUDIO

Power Error Diagnosis and Checks

Checking power indicators, voltages, and power off modes.

Audio Troubleshooting Methods

Steps for diagnosing no audio issues via menu and voltage checks.

DETAILED REPAIR PROCESS - FUNCTION/MISC

Remote Control and Wi-Fi Checks

Procedures for checking remote control and Wi-Fi/Bluetooth functionality.

Test Patterns for Video Error Diagnosis

Using test patterns to identify video defects like pixels or residual images.

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