ViewSonic VG150m-1 User manual

ViewSonic VG150m-1
Model No.VLCDS23587-3W
Service Manual
15” Color TFT LCD Display
( VG150m-1_SM_547-R ev.1 a –Dec 2 0 02 )
ViewSonic “ 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-858
3
VG150mb-1
VLCDS23587-4W

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
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1a 12/17/02 Initial Release DCN-2256 C.Shen

TABLE OF CONTENTS
Chapter 1 Precautions and Notices…………………………………………1
Chapter 2 Specification…………………………………………………….....3
2-1 General Specification………………………………………....3
2-2 Factory Preset Timing…………………………………….......4
2-3 D-Sub Connector Pin Assignment…………………………...5
Chapter 3 Disassembly / Assembly Instructions………………………...6
Chapter 4 Electronic Circuit Description…………………………………..7
4-1 Block Diagram………………………………………………….7
4-2 Main Board I/O Connections………………………………….8
4-3 Inverter Board I/O Connections………………………………8
4-4 Theory of Circuit Operation……………………………………9
Chapter 5 Adjustment………………………………………………………….24
Chapter 6 Troubleshooting FlowChart…………………………………..26
6-1 Figures of Wave Form……………………………………….26
6-2 Troubleshooting Flow Chart…………………...……………29
Chapter 7 Schematic Diagrams…………………………………………….33
Chapter 8 PCB Layout…………………………………………………………37
Chapter 9 ExplodedDiagram and Mechanical Parts List…………………41
Chapter 10 Recommended Spare Parts List………………………………….43
Chapter 11 Complete Parts List……………………………………………...44
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Appendix
Reader's Response

1. Precautions and Notices
Prior to using this manual, please ensure that you have carefully followed all the
procedures outlined in the user manual for this product.
Read all of these instructions.
Save these instructions for later use.
Follow all warnings and instructions marked on the product.
Do not use this product near water.
This display should be installed on a solid horizontal base.
When cleaning, use only a neutral detergent cleaner with a soft damp cloth. Do not
spray with liquid or aerosol cleaners.
Do not expose this display to direct sunlight or heat. Hot air may cause damage to
the cabinet and other parts.
Adequate ventilation must be maintained to ensure reliable and continued
operation and to protect the display from overheating. Do not block ventilation slots
and openings with objects or install the display in a place where ventilation may be
hindered.
Do not install this display near a motor or transformer where strong magnetism is
generated. Images on the display will become distorted and the color irregular.
Do not allow metal pieces or objects of any kind fall into the display from ventilation
holes.
Slots and openings in the cabinet and the back or bottom are provided for
ventilation, to ensure reliable operation of the product and to protect it from
overheating, those openings mustnot be blocked or covered. The openings should
never be blocked by placing the product on a bed, sofa, rug, or other similar surface.
This product should never be placed near or over a radiator or heat register. This
product should not be placed in a built-in installation unless proper ventilation is
provided.
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FCC Statement
This equipment has been tested and found to comply with the limits of Class B digital device, pursuant to part
15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference
in a residential installation. This equipment generatesand can radiate radio frequency energy, and if
not installed and used in accordance with the instructions, may cause harmful interference to radio
communication. However, there is no guarantee that the interference will not occur in a particular installation.
If this equipment does cause unacceptable interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the interference by
one or more of following measuresΚ
Reorient or relocate the receiving antenna.
Increase the separation between equipment and receiver.
Connect into an outlet on circuit different from that to which the receiver is connected.
Consult the dealer or an experience radio/TV technician for help.
FCC Warning
To assure continued FCC compliance the user must use a grounded power supply cord and the provided
shielded video interface cable with bonded ferrite cores. Also, unauthorized changes or modifications to
ViewSonic products will void the usercs authority to operate this device. Thus ViewSonic will not be held
responsible for the product and its safety.
CE Certification
This device complies with the requirements of the ECC directive 89/3366/EEC with regard to
sElectromagnetic compatibility.s
Safety Guidelines
Caution: Use a power cable properly grounded.Always use the AC Mains cords listed below for each areaΚ
USA (UL)
Canada (CSA)
Germany (VDE)
Switzerland (SEV)
Britain (BASE/BS)
Japan (Electric Appliance Control Act)
In other areas, use AC cord which meets the local safety standards.
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2. Specification
2-1 General Specification
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Characteristic Description
LCD Panel Mitsubishi 15.0” AA150XC01, 0.297mm (H/V), Anti-glare
Maximum Viewing Angles Horizontal: 150 degrees @ CRЊ10
Vertical: 110 degrees @ CRЊ10
Signal Input VideoΚRGB analog
SyncΚH.V. Separate Sync, H.V. Composite Sync
(TTL Compatible), Sync. On Green
HorizontalΚ30 to 62KHz
Vertical Κ50 to 75Hz
Connector Analog: 15 Pin Mini D-Sub
Maximum Resolution 1024x768
Video Bandwidth 85 MHz nominal
Display Area 304.1 mm (H) x 228.1 mm (V)
Power Voltage 87~264VAC @ 47~63 Hz
Power Consumption 40W max. (Adaptor plus monitor)
Operating Conditions Temperature : 32лto 104л(0кto 40к)
Humidity : 10% to 90% (no condensation)
Altitude : 0 to +3,000 meters
Storage Conditions Temperature : -4лto +140л(-20кto +60к)
Humidity : 10% to 90% (no condensation)
Altitude : 0 to +12,000 meters
Mechanical Dimensions Width: 359.0mm / 14.13”
Height: 325.0mm / 12.8”
Depth: 190.5mm / 7.5”
Depth side view panel w/o base: 49.0mm / 1.92”
Monitor Weight: 3.3Kg / 7.3 lbs
Package Dimensions Width: 480.0mm / 18.9“
Height: 425.0mm / 16.7”
Depth: 110.0mm / 4.3”
Gross: 5.1Kg (11.2 lbs)

2-2 Factory Preset Timing
This timing chart is already preset for the TFT LCD monitors.
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Timing Horizontal
Polarity Horizontal Frequency Vertical Polarity Vertical Frequency
VGA 640x350 + 31.47 kHz - 70.09 Hz
VGA 720x400 - 31.46 + 70.08
VGA 640x400 - 31.46 + 70.08
VGA 640x480 - 31.47 - 60.05
VESA 640x480 - 37.86 - 72.81
VESA 640x480 - 37.50 - 75.00
MAC 640x480 Composite 35.00 Ѻ66.66
VESA 800x600 + 35.15 + 56.25
VESA 800x600 + 37.87 + 60.31
VESA 800x600 + 48.07 + 72.18
VESA 800x600 + 46.87 + 75.00
MAC 832x624 SOG 37.86 Ѻ72.80
VESA 1024x768 - 48.36 - 60.00
VESA 1024x768 - 56.47 - 70.06
VESA 1024x768 - 58.03 - 71.91
VESA 1024x768 + 60.02 + 75.02
MAC 1024x768 Composite 60.24 Ѻ74.92

2-3 D-Sub connector Pin Assignment
The TFT LCD analog display monitors use a 15 Pin Mini D-Sub connector
as video input source.
Pin Number Pin Description
1 Red video input
2 Green video input
3 Blue video input
4 Ground
5 Ground
6 R video ground
7 G video ground
8 B video ground
9 +5V
10 Ground
11 No Connection
12 (SDA)
13 Horizontal sync (Composite sync)
14 Vertical sync
15 (SCL)
5
11
1
6
10
15
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3. Disassembly / Assembly Instructions
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AUDIO IN
SPEAKER
AC Outlet Adaptor
Main Board
Inverter
ControlBrightness
TFT
LCD
Panel
Digital
Signal
Analog
Signal
Video Card
12V
12V
VA C
Volumecontrol&Muteon/off
Speaker
Audioin
DC/DC
Converter
+5V
VLCD
+3.3V
+12V
Clamp
Video Gain
Video Level
ADC MUX
Scaling
Engine
Sync detect
Phase calibration
OSD Generator
OSD overlay
MUX
MCU port Dithering
Output control
Output
LCD
Panel
R, G, B
Sync
Buffer
U6
SYNCMOS
SM5964
MCU
HS
VS
HS
VS
U1 MRT
MASCOT
R, G, B offset
Gamma control
Audio amp.
4. Electronic Circuit Description
4-1 Block Diagram
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