ViewSonic VS11444 Manuale utente

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- (800) 888-8583

Service Manual

ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3

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

ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3

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

ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3

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.

ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3

5.2 Handling and Placing Methods

ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3

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

ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3

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)

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

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

ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3

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

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