Asus MW221 User Manual

22" LCD Color Monitor ASUS MW221
1
Service
Service
Service
Horizontal Frequency
30-83 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 Instruction…………...............……...........6
3.1.General Instructions...........................…...........6
3.2.Control Button…………….…..............……...............6
3.3.OSD Menu…………….…...........................…............8
4.Input/Output Specification............……………............11
4.1.Input Signal Connector............………….................11
4.2.Factory Preset Display Modes..........................12
4.3.Power Supply Requirements...............................12
4.4.Panel Specification.....………………..................13
5.Block Diagram…..…...................…………................15
5.1.Software Flow Chart……..…………………....….......15
5.2.Electrical Block Diagram……………..….......17
6.Schematic……………......................................19
6.1 Main Board.............................................19
6.2 Power Board....……....................................23
7.PCB Layout..………….......................................25
7.1.Main Board………........................................25
7.2.Power Board….......................................28
7.3 Audio Board....………....................................31
7.4.Key Board…………….....................................31
8.Maintainability……….......................................32
8.1.Equipments and Tools Requirement...............32
8.2.Trouble Shooting…………..............................33
9.White-Balance, Luminance adjustment.............39
10.Monitor Explode View………..…….…............41
11.BOM List…………………………………............42
12.Different Parts List………………………………58
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
http://www.wjel.net

Asus MW221 Specifications

General

Brand	Asus
Model	MW221
Category	Monitor
Language	English

Summary

Revision List

Safety Information

Important Safety Notice

Crucial safety guidelines for service personnel handling electronic equipment.

Monitor Specifications

LCD Monitor Description

Monitor Block Diagram

Visual representation of the LCD monitor's main components and their interconnections.

Operating Instructions

General Instructions

Basic steps for operating the monitor, including power and cable connections.

Control Buttons

Identification and function of the monitor's physical control buttons.

OSD Menu

OSD Function Introduction

Explanation of the different functions available within the OSD menu.

Image Settings

Adjustments for brightness, contrast, sharpness, saturation, position, and focus.

Color Settings

Options for adjusting color temperature and skin tone presets.

System Setup

Configuration options for volume, OSD timeout, language, and system reset.

Input/Output Specifications

Input Signal Connector

Pinout details for the analog input signal connector.

Factory Preset Display Modes

List of supported display modes with their timing parameters.

Power Supply Requirements

Electrical requirements for the monitor's power supply.

Panel Specifications

General Features

Overview of the LCD module's general characteristics and interface.

Display Characteristics

Specific visual and physical properties of the display panel.

Optical Characteristics

Optical performance metrics such as color, contrast, and viewing angle.

Electrical Characteristics

Electrical properties of the TFT-LCD panel and backlight unit.

Block Diagrams

Software Flow Chart

Diagram illustrating the monitor's software operational flow.

Main Board Electrical Block Diagram

Detailed electrical schematic of the main control board.

Power/Inverter Board Block Diagram

Functional block diagram of the power supply and backlight inverter circuit.

Schematics

Main Board Schematic

Complete circuit diagram for the monitor's main board.

Power Board Schematic

Complete circuit diagram for the power supply board.

PCB Layouts

Main Board PCB Layout

Physical layout of components and traces on the main board.

Power Board PCB Layout

Physical layout of components and traces on the power board.

Audio Board and Key Board Layout

Physical layout of components for audio and key input boards.

Maintainability and Troubleshooting

Equipments and Tools Requirement

List of necessary tools and equipment for servicing the monitor.

Main Board Troubleshooting

Diagnostic flowchart for common issues on the main board.

Power/Inverter Board Troubleshooting

Diagnostic flowcharts for power and backlight related problems.

Keypad Board Troubleshooting

Troubleshooting steps for issues related to the keypad or OSD instability.

Adjustments and Parts Lists

White-Balance and Luminance Adjustment

Procedure for calibrating color temperature and brightness.

Monitor Exploded View

Visual breakdown of the monitor's components with part numbers.

Bill of Materials (BOM)

Comprehensive list of all components used in the monitor.

Different Parts List

List of parts that differ between specific model variations.