ViewSonic VS11444 User manual

ViewSonic VX1945wm-3
Model No. VS11444
19” Color TFT LCD Display
(VX1945wm-3_SM Rev. 1a Nov. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA- [phone]
Service Manual

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Copyright
Copyright © 2006 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
Optiquest is a registered trademark of ViewSonic Corporation.
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 SM Editing Date ECR Number Description of Changes Editor
1a 11/7/2006 Initial Release Jamie Chang

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TABLE OF CONTENTS
1. Precautions and Safety Notices 1
2. Specification 4
3. Front Panel Function Control Description 14
4. Circuit Description 26
5. Adjustment Procedure 36
6. Troubleshooting Flow Chart 45
7. Recommended Spare Parts List 53
8. Exploded Diagram and Exploded Parts List 55
9. Block Diagram 59
10. Schematic Diagrams 60
11. PCB Layout Diagrams 67

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1. Precautions and Safety Notices
1. SAFETY PRECAUTIONS
This monitor is manufactured and tested on a ground principle that a user’s safety comes first. However,
improper used or installation may cause damage to the monitor as well as to the user.
WARNINGS:
This monitor should be operated only at the correct power sources indicated on the label on the rear
of the monitor. If you’re unsure of the power supply in you residence, consult your local dealer or
Power Company.
Use only the special power adapter that comes with this monitor for power input.
Do not try to repair the monitor by yourself, as it contains no user-serviceable parts. Only the
qualified technician can repair it.
Do not remove the monitor cabinet. There are high-voltage parts inside that may cause electric shock
to human bodies.
Stop using the monitor if the cabinet is damaged. Have it checked by a service technician.
Put your monitor only in a lean, cool, dry environment. If it gets wet, unplug the power cable
immediately and consult your closed dealer.
Always unplug the monitor before cleaning it. Clean the cabinet with a clean, dry cloth. Apply
non-ammonia based cleaner onto the cloth, not directly onto the glass screen.
Do not place heavy objects on the monitor or power cord.
2. PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety visual inspections and the
protection afforded by them cannot necessarily be obtained by using replacement components rated for
higher voltage, wattage, etc. Before replacing any of these components read the parts list in this manual
carefully. The use of substitute replacement parts, which do not have the same safety characteristics as
specified in the parts list, may create shock, fire, or other hazards.
3. SERVICE NOTES
When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.
Keep wires away from high voltage, high temperature components and sharp edges.
Keep wires in their original position so as to reduce interference.
Adjustment of this product please refers to the user’ manual.

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5.2 Handling and Placing Methods

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2. Specification
2.1.INTRODUCTION
FEATURES VX1945wm-3
Size 19 " wide
Luminance (Typ) 300 cd/㎡
Contrast Ratio (Typ) 700:1
Colors 16.2 M (6 bits + 2 bits FRC)
Response Time 5 ms(on/off)
Viewing Angle (H/V) 160 ° / 160 °
TFTLCD PANEL
1st
Innolux
MT190AW01 V.0
Recommend resolution 1440x900@60Hz
Analog (Head) Yes (75ohms, 0.7/1.0 Vp-p)
Video Digital (Head) Yes
3.5 mm Audio in (Head) Yes
Input Signal
Audio 3.5mm 2 in 1 Audio in (Base) Yes
3.5 Audio out (Base) Yes
Output Signal Audio Headphone out (Base) Yes
Separate Sync Yes
Composite Sync Yes
Sync Compatibility
Sync on Green Yes
PC Yes
Power Mac Yes
Compatibility
TV Box (NextVision 6) Yes
Power Voltage AC 100-240V, 50/60Hz Yes
On Mode(Typ) < 48 W
LCD
Off Mode (Max) 1 W≦
On Mode(Typ) < 24 W
Power
Consumption Multimedia base
On Mode (Max) 30 W≦
Upstream port (B type) X 1 Yes
USB Downstream port (A type) X 4 Yes
Card reader 8 in 1 Function SD/MMC/MS/MS PRO/CF I & II /MicroDrive/SM
Audio 2.1 CH - THD 10% (Max)
(Sat.: 2.5w x2 ; subwoofer:3w x1)
Yes
Tilt ( 20 ° - -5 °) Yes
Swivel No
Pivot No
Ergonomics
Height Adjust No
OSD Control [ 1 ] [ 2 ] [ ][▼] [▲] Yes
Physical (W x H x D) 450 x 434 x 209mm
Dimension Package (W x H x D) 545*515*162mm
Weight Physical (Net Weight) 5.2 Kg / 11.5 lbs

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Package (Gross Weight) 6.7 Kg / 14.8 lbs
Temperature (℉/℃) 32℉-104℉/ 0℃-40℃Operating
Condition Humidity (%) 20 % - 80 %
Temperature (℉/℃) -4℉-140℉/ -20℃-60℃
Storage Condition Humidity (%) 10% - 90 %
Regulation
Global: CB, MPR II, WEEE,ROHS , ISO13406-2
VSA:UL, cUL, FCC-B, TUV-S, NOM, Energy Star
VSE:TUV/ERGO,CE ,GOST-R+Hygienic ,SASO , ENERGY
VSI: BSMI, CCC, PSB, C-TICK, MIC
VSCN:CCC
ViewDock – Multimedia base Spec.
Device prococal USB 2.0/1.1
OHCI (Open Host Controller Interface)
USB Standards
EHCI (Enhanced Host Controller Interface)
USB 2.0 Speed
USB 1.x Speed
Mac OS X with USB 2.0 Support
Microsoft Windows XP/Me/2000/98SE with USB 2.0 Support
Mac OS 8.6 or above with USB 1.x Support and USB Card Support
1.4.1
Compatible Operating
Systems
Microsoft Windows XP/Me/2000/98SE with USB 1.x Support
Upstream 1 Upstream USB Type B Receptacle
USB Hub
Downstream 4 Downstream USB Type A Receptacles
USB Supplied Current
Self-Powered Mode: 500mA /Port
Idle Mode : 5mA /Port
Operating Mode: 100mA/Port
Secure Digital (SD)
Multi Media Card (MMC)
Compact Flash (CF) Type I
Compact Flash (CF) Type II
Micro Drive
Smart Media (SM)
Memory Stick (MS)
Memory Stick Pro (MS Pro)
XD
Upper Slot SMC/XD and SD/MMC
CardReader
4 slots
Lower Slot CF Type I/II and MS/MS Dual/MS Pro
Subwoofer 3.0W (typ) ; 5.0W (Max)
Nominal size Φ46mm
Audio / Speaker
S/N >85dB

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THD < 10% (Vol. Max)
S/N 60dB (Built-in)
MIC
Sensitivity: -38dB +- 3dB
VR Volume control
Rotation stopper strength: 1.0Kgf.cm
Total rotational angle: 220+ 5˚
Input 2-in-1 Audio-in x 1 (Audio-in / MIC-in)
Audio I/O
Output Audio-out x1 , Headphone out x1
iPOD connector Compatible with iPOD video/iPOD photo/iPOD nano/iPOD Mini/iPOD
U2/iPOD
Power adapter External
Input Voltage Range: 100~240V
Input Frequency: 50/60Hz
Output Voltage: 12V
Full load: 2.0A
Peak load: 2.5A
Size 303mm (W) x 212mm (L)
Connectivity Up to 127 Devices by Cascading Multiple Hubs
Power on Yellow-Green
iPod connecting Amber
Diagnostic LEDs iPod
connecting+Power
on
Yellow-green+Amber
Power consumption Typical 24W
Max.
30W
Storage Temperature -4ºF to 140ºF (-20ºC to 60ºC)
Storage Humidity 10% to 90% (Non-Condensing)
Operating Temperature 32ºF to 104ºF (0ºC to 40ºC)
Opreating Humidity 20% to 90% (Non-Condensing)
Certifications
Global: CB, WEEE,ROHS
VSA:UL, cUL, FCC-B, TUV-S, NOM
VSE:CE ,GOST-R+Hygienic ,SASO
VSI:BSMI, CCC, PSB, C-TICK, MIC
VSCN:CCC
Accessories USB A-B Cable ; 2-in-1 Cable ; Power adaptor ; iPod adapter set
(default x 1; 4 in set)
Package content Viewdock/Quick start guide/CD(for card reader windows 98
driver)/2-in-1 Aduio cable/USB cable/Power adapter/iPod adapter set

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2.2.GENERAL specification
Test Resolution & Frequency 1440x900 @ 60Hz
Test Image Size Full Size
Contrast and Brightness Controls Factory Default:
Contrast = 70%, Brightness = 100%
2.3.VIDEO INTERFACE
Analog Input Connector DB-15 (Analog),
Digital Input Connector DVI-D (Digital),
Default Input Connector Defaults to the first detected input
Video Cable Strain Relief Equal to twice the weight of the monitor for five
minutes
Video Cable Connector DB-15 Pin out Compliant DDC 1/2B
Video Signals
1. Video RGB (Analog)
Separate, Composite, and Sync on Green
2. TMDS (Digital)
Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)
Maximum PC Video Signal 950 mV with no damage to monitor
Maximum Mac Video Signal 1250 mV with no damage to monitor
Sync Signals TTL
DDC 1/2B Compliant with Revision 1.3
Sync Compatibility Separate Sync, Composite Sync, SOG
Video Compatibility Shall be compatible with all PC type computers,
Macintosh computers, and after market video cards
Resolution Compatibility
640 x 350*, 640 x 480, 720 x 400* (640 x 400*), 800 x
600, 832 x 624, 1024 x 768, 1152 x 864, 1152 x 870,
1280 x 720, 1280 x 960, 1280 x 1024 , 1400 x 1050 ,
1440 x 900
* The image vertical size might not be full screen.
But the image vertical position should be at the center.
Exclusions Not compatible with interlaced video
2.4.POWER SUPPLY
Internal Power Supply Part Number:ILPI-024
Input Voltage Range 90 to 264 VAC (100~240VAC ±10%)
Input Frequency Range 47 to 63 Hertz
Short Circuit Protection Output can be shorted without damage
Over Current Protection 5.0 A typical at 14.0 VDC