LG OLED48C3 Series User Manual

P/NO : MFL71991222 (2212-REV00)
CHASSIS : E*31C
MODEL : OLED48C3***
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.

LG OLED48C3 Series Specifications

General

Screen Size	48 inches
Display Type	OLED
HDR	HDR10, Dolby Vision, HLG
Refresh Rate	120Hz
Smart TV Platform	webOS
HDMI Ports	4 (HDMI 2.1)
Audio	Dolby Atmos
Voice Assistant	Google Assistant, Amazon Alexa
Processor	α9 Gen6 AI Processor 4K
USB Ports	3
Ethernet	Yes
Speaker System	2.2 Channel
Resolution	3840 x 2160 (4K)
Bluetooth	5.0
Wi-Fi	Yes (802.11ac)
Weight	32.6 lbs (without stand)
Dimensions (W x H x D)	42.2 x 24.6 x 1.8 inches (without stand), 42.2 x 26 x 9.3 inches (with stand)

Summary

SAFETY PRECAUTIONS

General Guidance

General advice for safe servicing practices.

Leakage Current Cold Check

Procedure for checking AC leakage current when the set is cold.

Leakage Current Hot Check

Procedure for checking AC leakage current when the set is hot.

SERVICING PRECAUTIONS

General Servicing Precautions

Essential precautions for servicing the TV and handling components.

Electrostatically Sensitive Devices (ES)

Precautions for handling static-sensitive electronic components.

General Soldering Guidelines

Best practices for soldering electronic components.

SPECIFICATION

Application and Test Requirements

Defines applicable models and outlines test conditions and procedures.

Test Methods

Outlines methods for performance and safety testing.

Model Specifications

Details regional, system, I/O, and input format specifications.

SOFTWARE UPDATE

USB Download

Procedure for updating TV software via a USB drive.

Network Download (NSU)

Procedure for updating TV software via network connection.

BLOCK DIAGRAM

EXPLODED VIEW

WIRING DIAGRAM

ASSEMBLY / DISASSEMBLY GUIDE

Remove Rear Covers, Stand, and Bracket

Steps to remove the TV's rear covers, stand, and power cord bracket.

Remove Internal Power Supply and Main PCB

Steps to remove the internal power supply and main PCB.

Remove Other Internal Components

Steps to remove speakers, WiFi module, stand, and VESA supporters.

TROUBLE SHOOTING GUIDE

Video Error Troubleshooting

Detailed steps for diagnosing and resolving various video-related issues.

Power Error Troubleshooting

Detailed steps for diagnosing and resolving power-related issues.

Audio Error Troubleshooting

Detailed steps for diagnosing and resolving audio-related issues.

Function Error Troubleshooting

Detailed steps for diagnosing and resolving various function errors.

Noise Troubleshooting

Procedure for diagnosing and resolving circuit or mechanical noise.

Exterior Defect Troubleshooting

Procedure for diagnosing and resolving external physical damage.

Standard Repair Process Detail Technical Manual

Video Error Diagnosis

Specific checks for video errors like no video, lag, or color issues.

Power Error Diagnosis

Specific checks for no power and intermittent power issues.

Audio Error Diagnosis

Specific checks for no audio issues.

Function Error Diagnosis

Specific checks for remote control, WiFi, and other functions.

Service Remote Control Usage

Instructions on how to use the service remote and its functions.

Appendix: Examples of Symptoms

Image Error Symptoms

Visual examples and causes of image-related symptoms.

Main Board Symptoms

Visual examples and causes of Main Board related symptoms.

Module Symptoms

Visual examples and causes of module-related symptoms.

T-Con Symptoms

Visual examples and causes of T-Con board related symptoms.

Appendix: Exchange Power Board (PSU)

Guide to inspecting parts for symptoms of no power / no screen

Appendix: How to check for OLED TV module defects