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
3

Copyright
Copyright © 2002 by ViewSonic Corporation. All rights reserved. No part of
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
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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