HCL HCMDLWBT21 User Manual

15.6" LCD Color Monitor HCL HCMDLWBT21&HCMDLWBN21
1
Service
Service
Service
Horizontal Frequency
30-60 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.
Table Of Contents…………………………………………...1
Revision List………………………………………………....2
Important Safety Notice.…….........................……...... 3
1. Monitor Specification..............................…………........4
2. LCD Monitor Description…………………………….......5
3. Operation Instructions....................................…...........6
3.1. General Instructions...........................…....................6
3.2. Control Buttons..………………………….…...............6
3.3 Adjusting the Picture.................................…..............7
4. Input/Output Specification............……………............10
4.1. Input Signal Connector............………….................10
4.2. Factory Preset Display Modes......…..................10
4.3. Panel Specification.....………………..................11
5. Block Diagram….........................................................13
5.1 Software Flow Chart………………………….……….13
5.2.Electrical Block Diagram…………………….......15
6. Schematic……………..............................................17
6.1 Main Board....……….............................................17
6.2 Power Board………………………………………....22
6.3 Key Board…………………...….……………………24
7. PCB Layout..………….............................................25
7.1. Main Board………................................................25
7.2. Power Board….....................................................26
7.3. Key Board….........................................................27
8. Maintainability………...............................................29
8.1.Equipments and Tools Requirement......................29
8.2.Trouble Shooting………........................................30
9. White-Balance, Luminance adjustment………..…...36
10. Monitor Exploded View…………………….…........38
11. BOM List…............................................................39
12. Different Parts List…………………………….…….61
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

HCL HCMDLWBT21 Specifications

General

Response Time	5 ms
Aspect Ratio	16:9
Brightness	250 cd/m²
Display Size	21.5 inch
Viewing Angle	178 degrees
Ports	VGA, HDMI
Resolution	1920 x 1080 (Full HD)

Summary

Important Safety Notice

1. Monitor Specification

3. Operation Instructions

3.1 General Instructions

3.2 Control Buttons

3.3 Adjusting the Picture

Guide to adjusting picture settings using the OSD menu and controls.

4. Input/Output Specification

4.3 Panel Specification

6. Schematic

6.1 Main Board

Detailed electrical schematic of the monitor's main control board.

6.2 Power Board

Electrical schematic for the power supply and backlight inverter circuitry.

8. Maintainability

8.1 Equipments and Tools Requirement

8.2 Trouble Shooting

Diagnostic guides and flowcharts for resolving common monitor faults.

9. White- Balance, Luminance adjustment