Toshiba 42HL67 - 42" LCD TV User Manual

SERVICE MANUAL
LCD Color Television
42HL67 Rev.1
This model is classified as a green product (*1), as indicated by the underlined serial number.
This Service Manual describes replacement parts for the green product. When repairing this
green product, use the part(s) described in this manual and lead-free solder (*2).
For (*1) and (*2), refer to GREEN PRODUCT PROCUREMENT and LEAD-FREE
SOLDER.
© TOSHIBA CORPORATION 2009
For Technical Bulletins, Technical Tips, or other information regarding the
service of this model, visit the Toshiba America Consumer Products National
Service Division website at:
www7.toshiba.com

Toshiba 42HL67 - 42" LCD TV Specifications

General

Brand	Toshiba
Model	42HL67 - 42" LCD TV
Category	LCD TV
Language	English

Summary

Important Notices and Safety Precautions

Service Safety Precautions

Outlines essential safety measures before servicing the chassis, including isolation transformers and proper handling.

Advanced Safety Procedures and Checks

AC Leakage Current Testing

Details the procedure for checking AC leakage current to ensure user safety.

AC Voltmeter Setup for Leakage Test

Product Safety and LCD Module Handling

LCD Module Handling Precautions

Provides essential safety and handling instructions for the LCD module to prevent damage or injury.

Service Mode Operations

Entering and Exiting Service Mode

Step-by-step guide on how to access and exit the television's service mode.

Adjusting Service Mode Parameters

Explains how to navigate and modify settings within the service mode menu.

Sound Troubleshooting Flowchart

Diagnosing Sound Problems

A flowchart to guide the diagnosis of missing or distorted sound issues based on signal type.

Picture Troubleshooting Flowchart

Diagnosing Picture Problems

A flowchart to guide the diagnosis of missing or distorted picture issues based on signal type.

Troubleshooting a Dead TV

Diagnosing No-Power Issues

Flowchart for diagnosing a dead TV, checking LED status and blink codes.

Second Level Troubleshooting: Dead Set

Power Supply and Voltage Checks

Detailed steps for checking power supply voltages at specific points to diagnose a dead set.

Second Level Video Troubleshooting

Video Signal and Display Issues

Flowchart for diagnosing video problems, including backlight, screen appearance, and signal types.

Power Distribution Checks for Video

Second Level Video Troubleshooting: Backlight

Backlight Functionality Checks

Flowchart to diagnose backlight issues, checking specific DC voltage levels.

Second Level Audio Troubleshooting

Audio Signal Input and Voltage Checks

Flowchart for diagnosing audio problems, checking input types and power supply voltages.

LCD Backlight Troubleshooting Guide

Diagnosing Backlight Unevenness

Troubleshooting steps for uneven screen lighting, including inverter and supply checks.

Backlight Supply and Signal Verification

Verifies backlight supply source and switching signals, and checks CCFL inverter operation.