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LG 42LC46-ZC User Manual

LG 42LC46-ZC
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LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LD73A
MODEL : 42LC46
42LC46-ZC
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LG 42LC46-ZC Specifications

General IconGeneral
Screen Size42 inches
Display TechnologyLCD
Aspect Ratio16:9
Brightness500 cd/m²
Response Time5ms
Viewing Angle178° (H) / 178° (V)
Input PortsHDMI, Component, Composite, VGA, RF
Sound Output10W x 2

Summary

Safety Precautions

General Guidance

General advice for safe servicing and handling of electrical components.

Leakage Current Cold Check

Procedure to check AC leakage current with the AC plug removed from the source.

Leakage Current Hot Check

Procedure to measure AC leakage current with the AC plug connected to the source.

Servicing Precautions

General Servicing Precautions

General guidelines for safe servicing, including unplugging power and handling components.

Electrostatically Sensitive (ES) Devices

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

General Soldering Guidelines

Best practices for soldering, including temperature, solder type, and tip maintenance.

Component Replacement and Repair

IC Remove/Replacement

Procedure for removing and replacing Integrated Circuits (ICs) on circuit boards.

Transistor Removal/Replacement

Methods for removing and replacing discrete transistors and power transistors.

Diode and Resistor Replacement

Guidelines for replacing diodes, fuses, and conventional resistors.

Circuit Board Foil Repair

Techniques for repairing damaged copper traces on printed circuit boards.

Specification

General Specification (TV)

Overall technical specifications for the TV unit, covering video, audio, and input systems.

LCD Module Specifications

General Specification (LCD Module)

Detailed specifications for the LCD module, including panel type, dimensions, and backlight.

Optical Features

26" LCD Module Specifications

Optical characteristics for 26-inch LCD modules (LPL and CMO).

32" LCD Module Specifications

Optical characteristics for 32-inch LCD modules.

Optical Features (37" and 42" Modules)

37" LCD Module Specifications

Optical characteristics for 37-inch LCD modules.

42" LCD Module Specifications

Optical characteristics for 42-inch LCD modules.

Video Input Specifications

Component Video Input (Y, PB, PR)

Technical details for component video input signals and resolutions.

RGB PC Input Modes

RGB PC Input Table

Specifications for various RGB PC input resolutions and timings.

HDMI Input Specifications

HDMI DTV Table

Specifications for HDMI DTV input signals, including resolutions and refresh rates.

HDMI PC Table

Specifications for HDMI PC input signals, including resolutions and refresh rates.

Mechanical Specifications

26-inch Model Specifications

Mechanical dimensions and weight for 26-inch TV models.

32-inch Model Specifications

Mechanical dimensions and weight for 32-inch TV models.

37-inch Model Specifications

Mechanical dimensions and weight for 37-inch TV models.

42-inch Model Specifications

Mechanical dimensions and weight for 42-inch TV models.

Adjustment Instructions

Application Range

Scope of application for the adjustment instructions for LD73A chassis.

Specification

General specifications relevant to the adjustment procedures.

Channel Memory Setup

Procedures for setting up channel memory and downloading configuration files.

ADC Calibration

Calibration procedures for Analog-to-Digital Converter (ADC) for different input signals.

Auto Color Balance Calibration

Methods for auto-calibrating color balance for RF, AV, S-Video, Component, and RGB inputs.

White Balance Adjustment

Procedure for manual white balance adjustment using a color analyzer.

Troubleshooting

No Power Symptom

Troubleshooting steps for a TV that does not power on or show any indicator lights.

Protect Mode Symptom

Troubleshooting steps for a TV stuck in protect mode, indicated by the front LED color.

No Raster Symptom

Troubleshooting steps for a TV with no picture (raster) but the front LED is green.

Strange Screen in Specific Mode

Troubleshooting for unusual screen display issues in specific input modes.

Screen Not Displaying in Specific Mode

Troubleshooting for screens that do not display properly from specific input sources.

Unusual Display by Input Mode

Troubleshooting for unusual display from S-Video/AV, Component, RGB, and HDMI inputs.

Unusual Display from SCART Inputs

Troubleshooting for unusual display issues related to SCART1 and SCART2 inputs.

No Sound Symptom

Troubleshooting steps for a TV that displays an image but has no sound output.

Block Diagram

Exploded View

Exploded View Parts List

Replacement Parts List

Capacitors

List of replacement capacitors with their specifications and part numbers.

Resistors

List of replacement resistors with their specifications and part numbers.

Diodes and Zener Diodes

List of replacement diodes and Zener diodes with specifications and part numbers.

Integrated Circuits (ICs)

List of replacement ICs with their specifications and part numbers.

Connectors, Jacks, and Switches

List of replacement connectors, jacks, switches, and tuner modules.

Crystals and Other Components

List of replacement crystals and other miscellaneous components.

Schematic Diagrams

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