THOMSON 27LM051B6 User Manual

27″ LCD TV Thomson 27LM051B6
1
Service
Service
Service
Horizontal Frequency
31.5-60 kHz
TABLE OF CONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
R FOR TH
UNIT WHEN S
8.1 Main Board.……….......................................98
8.2 Power Board……..……..............................100
8.3 Tuner Board…................................... 103
8.4 Key Board …................….......................104
8.5 IR Board …................….......................104
8.6 DC-DC Board....………….............................104
8.7 Headphone Board..……..…..........................105
9. Block Diagram.……........................................106
9.1 Main Board.………………………………..….106
9.2 Power Board…..…....…………………...........108
10. Schematic Diagram………………………...110
10.1 Main Board………..………………………..110
10.2 Power Board.....…...................................122
10.3 Tuner Board...……......................................124
10.4 Key Board……………….………………….127
Table Of Contents.......……..............................…........1
Revision List.…........................................…… ......2
1. Monitor Specification..............................………........3
2. Operating Instructions…………………….……….......4
2.1 The Use Of Remote Control..……………...................4
2.2 The Use Of Teletext……..........…...........…...........5
2.3 Front Panel Control Knobs.…............……...............6
2.4 OSD Operations .………........................…............7
2.5 How To Connect ……..............……………............15
3 Input/Output Specification…………..........................19
3.1 Input Signal Connector……..........................19
3.2 RGB Input Signal Timing …….....……......................20
4. Mechanical Instructions…………………..................21
5. Repair Flow Chart ……………………….……….....25
6. White Balance Luminance Adjustment….…........32
7.BOM List..……… ………… …… … ... .….… ….....36
8. PCB Layout ………….……………………....……........98

THOMSON 27LM051B6 Specifications

General

Screen Size	27 inches
Display Technology	LCD
Aspect Ratio	16:9
HDMI Ports	2
USB Ports	1
Headphone Jack	Yes
Built-in Speakers	Yes
Resolution	1366 x 768 pixels

Summary

Safety Notice and Precautions

Revision List

Monitor Specifications

LCD Panel Specifications

Technical details of the LCD panel, including type, aspect ratio, pixel count, and brightness.

Video and Audio Specifications

Specifies video input types, video system standards, and audio output options.

Power and Environment Specifications

Details power supply requirements, consumption, and operating environment conditions.

Operations Instructions

2.1 Remote Control Usage

Explains the function of each button on the remote control for TV operation.

2.2 Teletext Usage

Guide on how to use the Teletext service for information display.

2.3 Front Panel Controls

Description of the physical control knobs located on the front of the TV set.

2.4 OSD Operations

Details how to navigate and use the On-Screen Display (OSD) menus for settings.

2.5 Connection Guide

Instructions on how to connect external devices to the TV set.

Input/Output Specifications

3.1 Input Signal Connector Details

Explains the pin configuration and description of the 15-pin D-SUB signal cable connector.

3.2 RGB Input Signal Timing

Provides timing specifications for various RGB input resolutions and screen modes.

Mechanical Instructions

Repair Flow Chart

5.1 No Power (No LED Indicator)

Troubleshooting steps for when the TV does not power on and no LED indicator is active.

5.2 Cannot Start (LED Indicator Yellow)

Diagnostic process for when the TV fails to start, indicated by a yellow LED.

5.3 No Display (LED Indicator Green)

Troubleshooting steps for when the TV has power but no picture, indicated by a green LED.

5.4 Abnormal Display Issues

Flowchart for diagnosing and resolving abnormal video display problems.

5.5 No Sound Issues

Troubleshooting steps for when the TV has video but no audio output.

Key Board Troubleshooting

White Balance, Luminance Adjustment

BOM List

PCB Layout

8.1 Main Board PCB Layout

Component placement diagram for the main control board.

8.2 Power Board Layout

Layout diagram for the TV's power supply board.

8.3 Tuner Board Layout

Component layout for the TV tuner board.

8.4 Key Board Layout

Layout diagram for the TV's front panel key input board.

8.5 IR Board Layout

Layout diagram for the Infrared receiver board.

8.6 DC-DC Board Layout

Layout diagram for the DC-DC converter board.

8.7 Headphone Board Layout

Layout diagram for the headphone audio output board.

Block Diagram

9.1 Main Board Block Diagram

Illustrates the functional blocks and signal paths within the main board.

9.2 Power Board Block Diagram

Shows the functional blocks and power distribution of the TV's power supply.

Exploded View

Schematic Diagram

10.1 Main Board Schematic

Schematic diagram for the main control board of the TV.

10.2 Power Board Schematic

Schematic diagram for the TV's power supply board.

10.3 Tuner Board Schematic

Schematic diagram for the TV tuner board, detailing RF and signal processing.

10.4 Key Board Schematic

Schematic diagram for the TV's front panel key input board, showing button circuits.