ViewSonic VE150m User manual

ViewSonic VE150m/mb

Model No.VLCDS22574-1/-1b

Service Manual

15” Color TFT LCD Display

(VE150m/VE150mb-1_SM_399 - Rev. 1a – Dec 2002)

ViewSonic “381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-858

this publication may be reproduced, transmitted, transcribed, stored in a

retrieval system, or translated into any language or computer language, in any

form or by any means, electronic, mechanical, magnetic, optical, chemical,

manual or otherwise, without the prior written permission of ViewSonic

Corporation.

Disclaimer

ViewSonic makes no representations or warranties, either expressed or

implied, with respect to the contents hereof and specifically disclaims any

warranty of merchantability or fitness for any particular purpose. Further,

ViewSonic reserves the right to revise this publication and to make changes

from time to time in the contents hereof without obligation of ViewSonic to

notify any person of such revision or changes.

Trademarks

ViewSonic is a registered trademark of ViewSonic Corporation. All other

trademarks used within this document are the property of their respective

owners.

Revision History

Revision Date Description Approval

1a 11/17/02 Initial Release DCN-2806 C.Shen

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TABLE OF CONTENT

WARNING ......................................................................................1

SAFETY PRECAUTIONS...............................................................1

CHAPTER 1 PREFACE.........................................................3

CHAPTER 2 SPECIFICATIONS..........................................6

2.1 Scope.............................................................................................. 6

2.2 General Requirement.......................................................................7

2.3 Signal Interface ................................................................................7

2.4 Power................................................................................................8

2.5 Front Panel Controls and Indicators................................................ 10

2.6 Electrical Requirements .................................................................. 11

2.7 Audio............................................................................................... 12

2.8 LCD Panel....................................................................................... 13

2.9 Image Perfromance......................................................................... 14

CHAPTER 3 FRONT PANEL CONTROLS .........................15

3.1 Adjusting the Screen Image ............................................................ 15

3.2 Do the following to adjust the screen image:................................... 16

3.3 Main Menu Controls ........................................................................ 17

CHAPTER 4 CIRCUIT DESCRIPTION ...............................21

4.1 Main Board...................................................................................... 21

CHAPTER 5 TROUBLESHOOTING ...................................26

5.1 Equipment....................................................................................... 26

5.2 Main Procedure............................................................................... 26

CHAPTER 6 THEORY OF OPERATION ............................34

6.1 System Block Diagram.................................................................... 34

6.2 System Circuitry Description ........................................................... 35

CHAPTER 7 MECHANICAL ASSEMBLY............................36

CHAPTER 8 RECOMMENDED SPARE PARTS LIST ........40

CHAPTER 9 COMPLETE PARTS LIST ...........................42

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10.2 Micro Controller and LCD power control ......................................... 54

10.3 VGA input........................................................................................ 55

10.4 OutputConnector.......................................................................... 56

10.5 DC-DC ............................................................................................ 57

10.6 Audio............................................................................................... 58

CHAPTER 11 PCB LAYOUT .................................................59

CHAPTER 10 CIRCUIT DIAGRAMS.....................................53

10.1 Micro-Controller MRT MV ............................................................... 53

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WARNING

This service information is designed for experienced repair technicians,

do not attempt to do any form of disassembling or adjustment for the

product.

It does not contain warnings or cautions to advise non-technical individuals of

the potential dangers in attempting to service the product.

Products powered by electricity should be serviced or repaired only by

experienced professional technicians.

Any attempts to service or repair the inner products may cause serious injury.

SAFETY PRECAUTIONS

Warning: This device must be operated with the original power supply

CAUTION: Use a power cable that is properly grounded. Always use the

appropriate AC cord that is certified for the individual

country. Some examples are listed below:

USA .....................UL Switzerland........ SEV

Canada ................CSA Britain..................BASE/BS

Germany ..............VDE Japan...................Electric Appliance

Control Act

IMPORTANT NOTICE CONCERNING POWER CORD SELECTION

The power cord set for this unit has been enclosed and has been selected

according to the country of destination and must be used to prevent electric

shock. Use the following guidelines if it is necessary to replace the original

cord set, or if the cord set is not enclosed. The female receptacle of the cord

set must meet IEC-60320 requirements and will look like (Figure A1 below):

For the United States and Canada

In the United States and Canada the male plug is a NEMA5-15 style (Figure

A2), UL Listed, and CSA Labeled. For units which are mounted on a desk or

table, type SVT or SJT cord sets may be used. For units which sit on the floor,

only SJT type cord sets may be used. The cord set must be selected

according to the current rating for your unit. Please consult the table below for

the selection criteria for power cords used in the United States and Canada.

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Cord Type Size of Conductors in

Cord

Maximum Current Rating of

Unit

SJT 18 AWG

16 AWG

14 AWG

10 Amps

12 Amps

SVT 18 AWG

17 AWG 10 Amps

12 Amps

For European Countries

In Europe you must use a cord set which is appropriate for the receptacles in

your country. The cord set is HAR Certified, and a special mark that will

appear on the outer sheath, or on the insulation of one of the inner

conductors.

AC PLUG CORD PRECAUTIONS FOR THE UNITED KINGDOM

For your safety please read the following text carefully.

If the fitted moulded plug is unsuitable for the socket outlet then the plug

WARNING:

IMPORTANT: The wires in this mains lead are colored in accordance with the

following code: Green-and-Yellow: Earth

Blue: Neutral

Brown: Live

If the colored wires of the mains lead of this appliance do not correspond with

the colored markings identifying the terminals in your plug, proceed as

follows:

The wire which is colored GREEN-AND-YELLOW must be connected to the

terminal in the plug which is marked by the letter E or by the Earth symbol or

colored GREEN or GREEN-AND-YELLOW.

The wire which is colored BLUE must be connected to the terminal in the plug

which is marked with the letter N or colored BLACK. The wire which is colored

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should be cut off and safely disposed. There is a danger of serving, electronically

THIS APPLIANCE MUST BE CONNECTED TO EARTH GROUND.

shock, if the cut off plug is inserted into and appropriate socket.

If a new plug is to be fitted, please observe the wiring code as shown below. If

in any doubt, please consult a qualified electrician.

BROWN must be connected to the terminal in the plug which is marked

with the letter L or colored RED.

If you have any questions concerning which proper power cord to use, please

consult with the dealer from whom you have purchased the product.

PRECAUTION

For best viewing conditions sit at least 18" from the LCD Display.

AVOID TOUCHING THE SCREEN WITH YOUR FINGERS. Oils from

the skin are difficult to remove.

NEVER REMOVE THE REAR COVER. The LCD Display contains

high-voltage parts. You may suffer serious injury if you touch these parts.

Avoid exposing the LCD Display to direct sunlight or another heat source.

The ViewPanel should be facing away from direct sunlight to reduce glare.

Always handle your LCD Display with care when moving it.

Place your LCD Display in a well-ventilated area. Do not place anything

on the ViewPanel that prevents adequate dissipation of heat.

Ensure the area around the LCD Display is clean and free of moisture.

Do not place heavy objects on the LCD Display, video cable, or power

cord.

If smoke, abnormal noise, or strange odor is present, immediately

switch the LCD Display off and call your dealer or ViewSonic. It is dangerous

to continue using the LCD Display.

Chapter 1 PREFACE

The purpose of this manual provides integral information you need to

maintain the LCD Monitor. And this manual is applied to the mode of

1024 x 768 pixels color TFT LCD Monitor.

This manual is for the experienced electronic technicians and those with

similar backgrounds. Send the products back to the local distributor or

repair center. Do not attempt any disassembling actions that are

complex or aren’t mentioned in the troubleshooting chapter.

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The manual includes Engineering Specification,Front Panel

Control description, Circuit Description,Troubleshooting,Theory of

Operation,Mechanical Assembly,Service Parts List, and Circuit

Diagram. Each section will be briefly discussed below.

ENGINEERING SPECIFICATIONS

This CHAPTER provides the engineering specification for the

designated Display. Since we only provide a reference engineering specification

in this service manual, Please refer to ViewSonic£Engineering Product

Specification for detailed product specification.

FRONT PANEL CONTROL

This CHAPTER provides User Control Panel functions and descriptions.

Access to OSD (On Screen Display) setting, (eg. timing adjustment, default

setting, restoring to factory mode can be referenced in this CHAPTER.

CIRCUIT DESCRIPTIONS

The first part of this CHAPTER provides a functional block diagram

for the Display. The second part of this CHAPTER consists of a

detailed I/O connector PIN ASSIGNMENT for the PCBs.

TROUBLESHOOTING

Maintenance procedures described in this chapter are intended to

isolate faulty parts and replace them in the field. The chapter makes

explanations on how to detect errors, through a series of sequential flow

chart for fault detection and means of corrections. The material contained

in this chapter provides basic troubleshooting techniques on the module

level.

THEORY OF OPERATION

This chapter is written and designed for use on in-lab

troubleshooting. The chapter contains the detailed description on the

operations of parts, which are labeled on the Functional Block Diagram.

The chapter is intended for in-lab repair personnel who would conduct an

in-lab troubleshooting of the system.

MECHANICAL ASSEMBLY

This chapter contains an Exploded Drawing for the system, for which

can be used by the repair personnel for parts identity.

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This chapter aims to serve as a guide in procuring replacement parts for

this product.

CIRCUIT DIAGRAM

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SERVICE PARTS LIST

PCB LAYOUT

This CHAPTER provides functional circuits diagram of the LCD Display.

This CHAPTER provides PCB Layout of the LCD Display.

Chapter 2 SPECIFICATIONS

2.1 SCOPE

2.1.1 Introduction

Product Configuration This specification defines the configuration

and performance requirements for the

following monitors:

Worldwide product Product Name: VE150m / VE150mb

Model Number: VLCDS22574 - XYZ

Panel: CMO M150X3

** - 1st “*” is designated series from 0~9,

2nd “*” is designated for region A~Z, 3RD

“*” referred to color or new technology

2.1.2 Product Definition

Top Level Assembly

Notes:

a. All Power cables connect into Power

Supply.

b. All quantities are n=1 unless

otherwise specified.

c. All Items go into ‘All’ versions

(-M/-E/-P) unless otherwise

specified.

1. VE150m Product Assembly (Beige for

VE150m, Midnight Gray for VE150mb)

2. 1.8m US Power Cable

3. 1.8m Euro Power Cable, “Schuko”

4. 40 W DC Power Supply w/ 1.5m DC Cable lead

to Monitor.

5. Attached analog VGA Cable, 1.8 m w/Blue

connectors. DDC Compliant HPD (hot plug

detection).

6. Audio cable, 1.8 m with lime green (pantone

color# 577C) connector stereo mini

7. Quick Start guide / ViewSonic System wizard

CD-ROM. (No E-Color).

8. Warranty sticker

(For J model and G model)

9. Warranty card

(For J model and G model)

10. Carton sticker.

(G model only)

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