LG OLED55C3 Series - User Manual

LG OLED55C3 Series

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P/NO : MFL71991223 (2212-REV00)

CHASSIS : E*31C

MODEL : OLED55C3***

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.

Table of Contents

Questions and Answers

J
juliaclarkJul 30, 2025
What to do if LG OLED55C3 picture is broken or freezing?
- A
  awilsonJul 30, 2025
  If your LG OLED TV picture is broken or freezing, try these steps:* Check the RF signal level.* Verify if other equipment is causing the problem by connecting the RF cable to a different device like a DVD player, set-top box, or another TV.* Ensure the RF cable connection is secure; try reconnecting it or installing a booster.* If the issue persists, it may be necessary to replace the Main Board or contact your signal distributor (cable or air).
J
John MartinAug 13, 2025
How to troubleshoot color error on LG OLED55C3?
- B
  Bailey MichaelAug 13, 2025
  If you're experiencing color errors on your LG OLED TV, try these steps:1. Check the link and replace it if necessary.2. Check the color by inputting a Y cable and checking external input colors. If there's an AV error, replace the Main Board or module.3. Ensure your external devices and cables are working correctly; if not, request repair for the faulty device or cable.

LG OLED55C3 Series Specifications

General

Display Type	OLED
Screen Size	55 inches
Smart TV	Yes
Operating System	webOS
HDMI Ports	4
USB Ports	3
Refresh Rate	120Hz
Processor	α9 Gen6 AI Processor 4K
ALLM	Yes
Audio Output	40W
Resolution	3840 x 2160 (4K)
HDR	HDR10, Dolby Vision, HLG
Wi-Fi	Yes
Bluetooth	Yes (5.0)
VRR	Yes
Dimensions (W x H x D)	1228 x 706 x 46.9 mm (without stand)

Summary

Safety Precautions

General Guidance

General advice for safe servicing, including transformer use and wire placement.

Leakage Current Checks

Servicing Precautions

General Servicing Precautions

Electrostatically Sensitive (ES) Devices

General Soldering Guidelines

Software Update

Block Diagram

Trouble Shooting Guide

Video Error Troubleshooting

Diagnosing and resolving video display issues.

Power Error Troubleshooting

Diagnosing and resolving power-related issues.

Audio Error Troubleshooting

Diagnosing and resolving audio output issues.

Function Error Troubleshooting

Diagnosing and resolving operational or feature errors.

Noise Troubleshooting

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