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LG OLED55C7P-U User Manual

LG OLED55C7P-U
62 pages
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P/NO : MFL69826601 (1701-REV00)
CHASSIS : EA71E
MODEL : OLED55C7P OLED55C7P-U
MODEL : OLED65C7P OLED65C7P-U
OLED TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CONFIDENTIAL
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 © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
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LG OLED55C7P-U Specifications

General IconGeneral
Screen Typeoled
Wall Mount300mm x 200mm
Featuresblade slim design, oled, pixel level dimming, perfect black, infinite contrast, billion rich colors, true color accuracy
Tunerdigital
Screen Size54.6 inches, 55 inches
Resolution4k (2160p)
Refresh Rate60hz
Closed Captioningyes
HDRyes
HDR Formatdolby vision, hdr 10
Built-In Speakersyes
Surround Sounddts-hd, dolby atmos
Speakers Output40 watts
HDMI Ports4
HDMI 2.1 Ports0
HDMI ARC Portsyes
USB Ports3
Ethernetyes
RF Antennayes
Bluetoothyes
Networkbuilt-in wi-fi, ethernet
Digital Optical Audio Outputs1
Component Video Inputs1
Composite Video Inputs1
DVI0
SmartTVwebos
Streaming Serviceshulu, netflix, vudu, youtube
Voice Assistantgoogle assistant
Remote Controlmagic
3Dno
Power Consumption179 kilowatt hours
Depth with Stand8.5 inches
Height with Stand29.5 inches
Width with Stand48.4 inches
Net Weight with Stand42.3 pounds
Depth without Stand1.8 inches
Height without Stand28 inches
Net Weight without Stand38.1 pounds

Summary

Safety Precautions

Important Safety Notice

Key safety warnings regarding chassis parts and design modifications.

General Guidance

Advice on using isolation transformers, replacing fuses, and managing wires during service.

Leakage Current Hot Check

Procedure for checking AC leakage current with a resistor and capacitor.

Servicing Precautions

General Servicing Precautions

Guidelines for unplugging, testing, cleaning, and handling components during service.

Electrostatically Sensitive (ES) Devices

Techniques to prevent damage to sensitive electronic components from static electricity.

General Soldering Guidelines

Recommendations for soldering iron temperature, solder type, and cleaning tips.

Component Handling & Repair

IC Remove/Replacement

Steps for removing and replacing integrated circuit components.

Transistor & Diode Replacement

Procedures for replacing transistors and diodes, ensuring correct polarity and leads.

Fuse and Resistor Replacement

Methods for replacing fuses and resistors, maintaining spacing and securing connections.

Circuit Board Foil Repair

Techniques for repairing damaged copper patterns on circuit boards using jumper wires.

Product Specifications

Application and Test Conditions

Defines the TV chassis and environmental/power conditions for testing.

Test Methods and General Specs

Outlines performance evaluation methods and general product specifications.

External Input Support

HDMI Input (PC/DTV) Support

Lists supported resolutions, frequencies, and pixel clocks for HDMI PC and DTV inputs.

External Input Support (Cont.)

DTV Input Formats

Details supported resolutions, frequencies, and formats for Digital TV inputs.

Software Update Procedures

USB Software Update

Step-by-step guide for updating TV software using a USB memory stick.

Network Software Update (NSU)

Instructions for updating TV software via a network connection (internet).

System Block Diagram

System-on-Chip (SOC) Overview

Illustrates the System-on-Chip architecture and its connected components.

System Block Diagram (Cont.)

Tuner and CI Interface

Details the Tuner and Conditional Access (CI) slot connections and signals.

System Block Diagram (Cont.)

Video and Audio I/O Connections

Shows the connections for various video and audio input/output interfaces.

System Block Diagram (Cont.)

HDMI 2.0 Interface Details

Depicts the HDMI 2.0 interface connections, including PHY and HDCP details.

System Block Diagram (Cont.)

USB, Wi-Fi, M-Remote, UART

Illustrates the connections for USB, Wi-Fi, M-Remote, and UART interfaces.

System Block Diagram (Cont.)

I2C Communication Map

Provides a map of Inter-Integrated Circuit (I2C) communication lines.

Exploded View and Safety

Exploded View Safety Notice

Reiteration of safety warnings regarding specific parts identified in the exploded view.

Internal Component Assembly Diagram

Visual representation of the TV's internal components and their assembly.

Disassembly Guide

Initial Screw and Cable Removal

First steps for disassembling the TV, focusing on screw removal and cover detachment.

Disassembly Cable Removal

Steps for disconnecting internal cables from the main board and modules.

Disassembly Guide (Cont.)

IR and WiFi PCB Disassembly

Detailed steps for removing the IR assembly and Wi-Fi PCB.

Disassembly Guide (Cont.)

Specific Screw Disassembly Steps

Specific steps for removing screws in a particular section of the TV.

Disassembly Guide (Cont.)

Further Screw Disassembly Steps

Additional steps for screw removal in different areas of the TV.

Disassembly Guide (Cont.)

Speaker Removal Procedure

Instructions for removing the left and right speakers from the TV.

Disassembly Guide (Cont.)

Disassembly Completion Overview

Final step in the disassembly process, showing the completed state.

Repair Process Overview

Standard Repair Process Table

Lists error symptoms categorized by type (Video, Power, Audio, Function, Noise, Exterior).

Standard Repair Process: Video Errors

No Video / Normal Audio Troubleshooting

Troubleshooting flowchart for 'No video/Normal audio', checking voltages and boards.

Standard Repair Process: Video Errors (Cont.)

No Video / No Audio Troubleshooting

Troubleshooting steps for 'No video/No audio' problems, focusing on power board voltages.

Standard Repair Process: Video Errors (Cont.)

Picture Broken / Freezing Troubleshooting

Troubleshooting for picture issues, checking signal levels, cables, and software.

Standard Repair Process: Video Errors (Cont.)

Color Error Troubleshooting

Steps to diagnose and fix color issues by checking input signals and link cables.

Standard Repair Process: Video Errors (Cont.)

Display Artifacts Troubleshooting

Troubleshooting for display artifacts like bars or spots, checking inputs and link cables.

External Device Color Error

Diagnosing color errors related to external device connections and software versions.

Standard Repair Process: Power Errors

No Power Troubleshooting

Troubleshooting steps for 'No power' issues, checking power indicators and voltages.

Standard Repair Process: Power Errors (Cont.)

Intermittent Power Off Troubleshooting

Diagnosing intermittent power-off issues, checking power off modes and voltages.

Standard Repair Process: Audio Errors

No Audio Troubleshooting

Troubleshooting for 'No audio' problems, checking speaker settings and connections.

Standard Repair Process: Audio Errors (Cont.)

Audio Distortion/Noise Troubleshooting

Diagnosing audio distortion, noise, or discontinuation issues by checking input signals and speakers.

Standard Repair Process: Function Errors

Remote Control Operation Issues

Troubleshooting steps for remote control operation failures, checking connections and signals.

Standard Repair Process: Function Errors (Cont.)

Magic Remote (MR15RA) Issues

Diagnosing issues with the Magic Remote, checking receiver version and RF connections.

Standard Repair Process: Function Errors (Cont.)

Wi-Fi Connectivity Issues

Troubleshooting Wi-Fi connectivity problems, checking MAC values and cable connections.

Standard Repair Process: Function Errors (Cont.)

External Device Recognition Errors

Steps to resolve issues where external devices are not recognized, checking technical information.

Standard Repair Process: Noise Issues

Circuit and Mechanical Noise Diagnosis

Diagnosing and resolving circuit or mechanical noise issues in the TV.

Standard Repair Process: Exterior Defects

Exterior Damage and Repair

Steps for addressing external physical damage to the TV, such as cabinet or module damage.

Detailed Repair Manual Contents

Video Error Troubleshooting Details

Detailed content for specific video error checks like Vx1 lock and signal strength.

Appendix: Component Exchange Types

Appendix detailing defect types and exchange procedures for key modules.

Detailed Repair Manual Contents (Cont.)

Power/Audio/Function Error Details

Detailed content for power, audio, and function error troubleshooting.

Tool Option Method

Detailed content for changing tool options.

Video Error Troubleshooting: Vx1 Lock

Vx1 Lock Voltage Check Procedure

Detailed steps to check Vx1 lock and related voltage for video issues.

Video Error Troubleshooting: White Balance

White Balance Adjustment Method

Detailed steps to check and adjust White Balance values.

Video Error Troubleshooting: Tuner Signal

Tuner Input Signal Strength Check

Steps for checking TUNER input signal strength and related settings.

Video Error Troubleshooting: Software Version

TV Software Version Check

Method for checking the TV's software version using the remote control.

Video Error Troubleshooting: Tuner Check

Tuner Component Voltage Check

Detailed steps for checking the TUNER component and voltage.

Video Error Troubleshooting: Connection Diagram

External Input Connection Check

Explains checking the connection diagram for display issues by signal.

Video Error Troubleshooting: Link Cable

Link Cable Reconnection Check

Steps to check the Link Cable (Vx1) reconnection condition for color errors.

Appendix: Main Board Exchange

Main Board Solder/CNT Defects

Visual examples of main board defects related to solder and CNT connection failures.

Main Board Power Section Defects

Visual examples of main board defects related to abnormal power supply sections.

Main Board Short/Crack Defects

Visual examples of main board defects involving solder shorts or cracks.

Appendix: Main Board Exchange (Cont.)

Main Board Power/Display/Noise Defects

More visual examples of main board defects in power, display, and noise issues.

Appendix: Power Board (PSU) Exchange

PSU Defects: No Light/Picture Issues

Visual examples of PSU defects causing no light or picture issues.

Appendix: Module Exchange (1)

Module Defects: Display Artifacts

Visual examples of module defects causing vertical display abnormalities or line dimming.

Module Defects: Physical Damage

Visual examples of module defects caused by physical press damage or burning.

Module Un-repairable Cases

General note on un-repairable module cases requiring exchange.

Appendix: Module Exchange (2)

Module Defects: Color/Brightness/Noise

Visual examples of module defects causing color/brightness differences or noise.

Module Defects: Line/Mura Issues

Visual examples of module defects causing line defects or Mura (uneven brightness).

Module Un-repairable Cases

General note on un-repairable module cases requiring exchange.

Power Error Troubleshooting: Power Indicator

Front Power Indicator Check

Steps to check the front power indicator status and basic functions.

Power Error Troubleshooting: Voltage Checks

Input and ST-BY Voltage Checks

Steps to check power input voltage and ST-BY voltage.

Power Error Troubleshooting: Power Off Modes

Power Off Mode Menu Check

Method for checking Power Off Modes using the TV's menu.

Audio Error Troubleshooting: Sound Settings

Audio Output Menu Check

Steps for checking audio output settings in the TV menu.

Audio Error Troubleshooting: Speaker Voltage

Speaker Voltage and Contact Check

Steps for checking speaker voltage and contact conditions.

Function Error Troubleshooting: Remote Control

IR Cable and Standby Voltage Check

Steps for checking IR cable condition and standby voltage for remote control.

Function Error Troubleshooting: Motion Remote/Wifi

BT/Wifi Cable and 3.5V Check

Steps for checking BT/Wifi cable condition and 3.5V supply for motion remote.

Video Error Troubleshooting: Test Patterns

Test Pattern Usage for Color Errors

Steps for using adjustment test patterns and checking specific items via remote.

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