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LED LCD TV
SERVICE MANUAL
CHASSIS : LB22E
MODEL : 47LM6610/661Y/6690
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67441803 (1202-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
47LM6610/661Y-TB 47LM6690-TC
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea
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Summarization of Contents
Safety Precautions
Important Safety Notice
Key safety notices for servicing procedures and component handling.
General Guidance
General rules for safe servicing procedures and precautions.
Leakage Current Checks
Procedures for checking AC leakage current (Cold and Hot checks).
Servicing Precautions
General Servicing Precautions
Standard procedures for servicing equipment safely.
Handling ES Devices
Precautions for handling electrostatic sensitive components.
Soldering Guidelines
Best practices for soldering electronic components.
Component Replacement Procedures
IC and Transistor Replacement
Procedures for replacing ICs and discrete transistors.
Diode, Fuse, and Resistor Replacement
Methods for replacing diodes, fuses, and conventional resistors.
Circuit Board Foil Repair
Techniques for repairing damaged copper foil on PCBs.
Product Specifications
Application Range and Test Requirements
Details on product usage, environmental conditions, and testing parameters.
Test Methods
Procedures and standards for product testing.
Model General Specifications
General technical specifications for the TV model, including market and broadcasting.
Input Signal Specifications
Component Video Input Details
Specifications for Y/Cb/Cr and Y/Pb/Pr input signals.
PC RGB Input Specifications
Resolution and frequency for PC RGB input.
HDMI and PC Input Specifications
HDMI Input Specifications
Detailed specifications for HDMI input modes (DTV and PC).
PC Mode Input Specifications
PC input resolution and frequency details.
Adjustment Procedures
Designation and Preparation
Designation of adjustment order and preparation steps.
Main PCB Check Process
Steps for checking and processing the main PCB.
Software and Calibration Processes
USB Software Download
Procedure for downloading software via USB.
ADC Process and Calibration
Steps for Analog-to-Digital Converter calibration (OTP and External).
Function Check
Verifying display and sound functionality.
Assembly Line Operations
Adjustment Preparation
Preparing equipment and conditions for adjustment.
White Balance Adjustment
Procedures for adjusting white balance settings.
EDID and Data Management
DPM and EDID Write Procedures
Confirming DPM and writing EDID data for RGB/HDMI.
EDID Data and Download Methods
Details on EDID data and auto/manual download.
Model and Function Checks
Command Set and Download Methods
Using command sets and downloading model/serial numbers.
Local Dimming Function Check
Verifying the local dimming feature functionality.
Advanced Feature Testing
3D and Wi-Fi Functionality Tests
Testing 3D capabilities and Wi-Fi connectivity.
Remote Control and Outgoing Checks
Testing remote control and outgoing configuration.
Screw Assembly Guide
Screw Specifications and Application
Guide to screw types and their usage in assembly.
Block Diagram
System Architecture Overview
Visual representation of the TV's internal system components.
Exploded View
Component Identification
Visual breakdown of the TV for part identification.
Schematic Diagram
Main Circuitry Schematics
Electrical schematics of the TV's main components.
Input/Output Connectors
RGB, PC Audio, and SPDIF Connections
Schematics for RGB, PC Audio, and SPDIF connector interfaces.
Communication and Audio Jacks
RS232C, Component, and CVBS Jacks
Schematics for RS232C, Component, and CVBS audio/video jacks.
Control Interfaces
IR Sensor and Keypad Schematics
Schematics for the IR sensor and keypad interface.
USB and Wi-Fi Interfaces
USB Power and Data Interfaces
Schematics for USB power supply and data connections.
Remote Control Options
ZigBee Motion Remote Schematics
Schematic for the ZigBee-based motion remote control.
Network Connectivity
Ethernet Block Schematics
Electrical diagram for the Ethernet network interface.
Audio Output Components
Speaker Output Schematics
Schematics for driving left and right speakers.
Audio Amplification
Earphone Amplifier Schematics
Circuit diagram for the headphone amplifier.
Tuner Systems
Tuner Schematics (EU/China)
Schematics for T/C/S, H/NIM, and T2/C tuners.
Commercial and Audio Interfaces
RS-232C and Audio Out Jack Schematics
Schematics for commercial 12V RS-232C and audio output jacks.
LVDS Display Interface
LVDS Output Connector Schematics
Schematics for LVDS output connectors.
Local Dimming Control
Local Dimming Schematics
Circuit diagram for controlling local dimming to LED drivers.
Power and Level Shifting
Power Block and Level Shifter Schematics
Schematics for the power block and level shifter circuits.
Embedded Multi-Media Card (eMMC) Interface
eMMC Interface Schematics
Schematics for the eMMC interface with various memory types.
Micom Interface
Logo Light Control Schematics
Schematics for controlling the logo light via the Micom.
Standard Repair Process
Video Error Troubleshooting
Flowchart for diagnosing and resolving video errors.
Standard Repair Process
Troubleshooting No Video/Audio
Steps to diagnose issues with no video or audio.
Standard Repair Process
Picture Problem Diagnosis
Troubleshooting guide for picture issues like broken or freezing images.
Standard Repair Process
DVB-S/S2 Picture Troubleshooting
Diagnosing picture problems related to DVB-S/S2 signals.
Standard Repair Process
Video Color Error Troubleshooting
Steps to diagnose and fix color-related video errors.
Standard Repair Process
Visual Defect Troubleshooting
Diagnosing bars, residual images, and external device errors.
Standard Repair Process
No Power Troubleshooting
Steps to diagnose and resolve the 'No Power' error.
Standard Repair Process
Power Interruption Troubleshooting
Diagnosing power issues like auto shut-off or intermittent power.
Standard Repair Process
No Audio Troubleshooting
Steps to diagnose and fix issues with no audio or normal video.
Standard Repair Process
Audio Distortion Troubleshooting
Diagnosing wrecked audio, discontinuation, and noise issues.
Standard Repair Process
Remote Control Operation Errors
Troubleshooting remote control and local switch issues.
Standard Repair Process
External Device Recognition Errors
Diagnosing issues with external device recognition.
Standard Repair Process
Noise Troubleshooting
Diagnosing and resolving circuit or mechanical noise issues.
Standard Repair Process
Exterior Defect Troubleshooting
Addressing issues related to physical defects on the TV exterior.
Repair Process Details
White Balance Adjustment
Procedure for checking and adjusting white balance values.
Repair Process Details
Power Board Voltage Measurement
Method for measuring power board voltages for troubleshooting.
Repair Process Details
Tuner Signal Strength Check
Checking tuner signal strength via menu and using attenuators.
Repair Process Details
LCD-TV Version Check
Method for checking the LCD TV software version via remote.
Repair Process Details
LCD TV Connection Diagram
Diagram illustrating TV connections for troubleshooting.
Repair Process Details
Tuner Component Check
Inspecting the tuner component for video error issues.
Repair Process Details
Test Pattern Adjustment
Using test patterns via ADJ key for color error diagnosis.
Appendix: Module Exchange
T-Con Board Exchange (Part 1)
Visual examples of T-Con board defects for exchange.
Appendix: Module Exchange
T-Con Board Exchange (Part 2)
More visual examples of T-Con board defects for exchange.
Appendix: Module Exchange
PSU/LED Driver Exchange
Visual examples of PSU/LED driver issues like no light or dim light.
Appendix: Module Exchange
Module Exchange Cases (Part 1)
Visual examples of panel mura, light leakage, and press damage.
Appendix: Module Exchange
Module Exchange Cases (Part 2)
Visual examples of vertical/horizontal block and line defects.
Repair Process Details
Front Display LED Check
Checking the front display LED status and color for power errors.
Repair Process Details
Power Input and ST-BY Voltage Check
Checking input voltage and ST-BY voltage for power issues.
Repair Process Details
Power ON Status Check
Verifying the 'power on' pin status when the unit is powered on.
Repair Process Details
Power Off Mode Check
Checking the power off mode status and options.
Repair Process Details
Audio Menu Check for No Audio
Checking audio settings in the menu for no audio issues.
Repair Process Details
Voltage and Speaker Check for Audio
Checking voltages and speaker connectivity for audio issues.
Repair Process Details
Remote Controller Operation Check
Checking IR cable, ST-BY voltage, and pre-amp for remote issues.
Repair Process Details
VCOM Adjustment Sequence
Steps for adjusting VCOM value to minimize screen flicker.
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