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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.

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

LG OLED55C3 Series Specifications

General IconGeneral
Display TypeOLED
Screen Size55 inches
Smart TVYes
Operating SystemwebOS
HDMI Ports4
USB Ports3
Refresh Rate120Hz
Processorα9 Gen6 AI Processor 4K
ALLMYes
Audio Output40W
Resolution3840 x 2160 (4K)
HDRHDR10, Dolby Vision, HLG
Wi-FiYes
BluetoothYes (5.0)
VRRYes
Dimensions (W x H x D)1228 x 706 x 46.9 mm (without stand)

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