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LED TV
SERVICE MANUAL
CHASSIS : UBX3E
MODEL : 65UN72***TF / 7240PVG
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71710501 (2010-REV01)
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 © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
65UN7340PVC / 73*0PT*
65UN731C0GC / TC / VC
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Summarization of Contents
Safety Precautions
Important Safety Notice
Essential safety parts must be replaced with specified components to prevent hazards.
General Guidance
General advice for servicing, including using isolation transformers and handling fuses.
Leakage Current Hot Check
Procedures for performing AC leakage current checks to ensure safety.
Servicing Precautions
General Servicing Precautions
General guidelines for safe servicing, including unplugging the unit and handling components.
Electrostatically Sensitive (ES) Devices
Techniques to prevent damage to sensitive electronic components from static electricity.
General Soldering Guidelines
Best practices for soldering, including tool selection, temperature, and techniques.
Component Handling and Replacement
Procedures for safely removing and replacing various components like ICs, transistors, diodes, and fuses.
Specification
Application Range
Defines the application scope of this service manual for LED TVs.
Requirement for Test
Specifies the conditions and parameters for testing TV components and performance.
Test Method
Outlines the testing methodologies and standards used for TV performance evaluation.
Model General Specification
Details general specifications for various models, including market, broadcast systems, and inputs.
External Input Support Format
Lists supported formats for component and HDMI inputs, including resolutions and frequencies.
Software Update
USB Download
Step-by-step guide for updating TV software via a USB drive.
NSU Download
Guide for updating TV software using the Network Software Update (NSU) feature.
Exploded View
Exploded View (Set Components)
Illustrates the physical arrangement of the TV's external and major internal components.
Exploded View (Module Components)
Detailed breakdown of the TV module components with part identification.
Assembly / Disassembly Guide
Back Cover Assembly and Disassembly
Procedures for assembling and disassembling the TV's back cover.
Module Disassembly and Component Handling
Step-by-step guide for disassembling module components and handling parts like LED arrays.
Trouble Shooting Guide
Standard Repair Process Overview
Index of common error symptoms and their corresponding repair process pages.
Video Error Troubleshooting
Diagnoses and steps for resolving video-related issues like no video or picture freezing.
Power Error Troubleshooting
Guides for diagnosing and fixing power-related problems such as no power or auto power off.
Audio Error Troubleshooting
Steps to troubleshoot audio issues like no audio, distorted audio, or sound discontinuation.
Function Error Troubleshooting
Procedures for resolving functional errors related to remote control, Wi-Fi, and external device recognition.
Noise and Exterior Defect Troubleshooting
Guides for identifying and resolving circuit/mechanical noise and external physical defects.
Appendix: Symptom Examples and Repair Details
Detailed explanations and visual examples of common symptoms and part-specific repair guidance.
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