ViewSonic VX912-4 Manuale utente

ViewSonic VX912-4

Model No. VS10162

19” Color TFT LCD Display

(VX912-4_SM Rev. 1a Jun. 2006)

ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

Service Manual

ViewSonic Corporation Confidential - Do Not Copy VX912-4

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

Opt quest 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 06/07/2006 Initial Release J. Chang

ViewSonic Corporation Confidential - Do Not Copy VX912-4

TABLE OF CONTENTS

1.Precautions and Safety Notices 1

2.Specification 4

3.Front Panel Function Control Description 9

4.Circuit Description 11

5.Adjustment Procedure 23

6.Troubleshooting Flow Chart 42

7.Recommended Spare Parts List 45

8.Exploded Diagram and Exploded Parts List 47

9.Block Diagram 50

10.Schematic Diagrams 51

11.PCB Layout Diagrams 58

ViewSonic Corporation Confidential - Do Not Copy VX912-4

1. Precautions and Safety Notices

1. Caution :

No modification of any circuit should be attempted . Service work should only be performed after you are thoroughly familiar

with all of the following safety checks and servicing guide line

2. Safety Check :

Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit. These voltage

are exposed in such areas as the associated transformer circuits .

3. POWER SUPPLY REQUIREMENTS

The external power converter for this display utilizes AC and DC cords , AC cord is detachable , but DC cord is

permanently attached .Any attempt to replace another adapter could result in serious problem on the display .

4. LEAKAGE CURRENT HOT CHECK

4-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during this check.

4-2 Connect a 1500 ohm , 10 watt resistor , paralleled by a 0.15uF capacitor between each metallic part and a good earth

ground

4-3 Use an AC voltmeter with 1000 ohm / volt or more sensitivity and measure the AC voltage across the combination

1500 ohm resistor and 0.15uF capacitor.

4-4 Move the resistor connection to each exposed metallic part and measure the voltage.

4-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement.

4-6 Voltage measured must not exceed 1.5 volt RMS, from any exposed metallic part to the ground.A leakage current

tester may be used in the above hot check, in which case any circuit measured must not exceed 1.0 milliamp. In the case of a

measurement exceeding the 1.0 milliamp value, a rework is required to eliminate the chance of a shock hazard .

To Metal Parts

AC VOLTMETER

1500 10W

0.15u

Earth Ground

ViewSonic Corporation Confidential - Do Not Copy VX912-4

Correct methods : Incorrect Methods :

Only touch the metal-frame of the panel or the front

cover of the monitor .

Do not touch the surface of the polarizer .

Surface of the panel is pressed by fingers & this may

cause “ MURA“

Take out the monitor with cushion Take out the monitor by grasping the LCD panel.

That may cause “ MURA“.

ViewSonic Corporation Confidential - Do Not Copy VX912-4

Correct Methods : Incorrect Methods :

Place the monitor on a clean & soft foam pad . Place the monitor on foreign objects .

That could scratch the surface of panel

ViewSonic Corporation Confidential - Do Not Copy VX912-4

2. Specification

GENERAL specification

Test Resolution & Frequency 1280x1024 @ 60Hz

Test Image Size Full Size

Contrast and Brightness Controls Factory Default:

Contrast = 70%, Brightness = 100%

VIDEO INTERFACE

Analog Input Connector DB-15 (Analog), refer the appendix A

Digital Input Connector DVI-I (Digital), refer the appendix B

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 LVDS

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

* 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

ViewSonic Corporation Confidential - Do Not Copy VX912-4

POWER SUPPLY

Internal Power Supply Part Number: FSP035-1PI01

Input Voltage Range 90 to 264 VAC

Input Frequency Range 47.5 to 63 Hertz

Short Circuit Protection Output can be shorted without damage

Over Current Protection 3.5 A typical at 12.0 VDC ( Protect when short circuit )

Leakage Current 0.75mA (Max) at 264VAC / 50Hz

Efficiency 77 % typical at 115VAC Full Load

Fuse Internal and not user replaceable

Power Dissipation 35 Watts (typ)

Max Input AC Current 1.2 Arms @ 90VAC, 0.7 Arms @265VAC

Audio interface(SPEAKER SPECIFICATION)

Line input connection 3.5mm stereo jack

Line input signal 1.3Vrms

Line input impendence 10Kohm

Maximum Power output 1W@<5% distortion

Signal to Noise Ratio 72dB

Frequency response 200Hz – 20K

Distortion <5% THD @1K

Vibration There should be no audio vibration with

Volume at 100% and treble/bass at default

Screen image There should be no affect on the screen

Image stability under any conditions.

Connector PC99 requirement Audio in Lime Green pantone # 577C

Cable type / length 3.5mm stereo cable / 1.8m length

Audio DPMS

Speakers stay on where the rest of the monitor is in

power –saving.

Note: There us no guarantee <1w power consumption

in active off mode when the Audio cable is connected.

ViewSonic Corporation Confidential - Do Not Copy VX912-4

ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Horizontal Frequency 30 – 82 kHz

Vertical Refresh Rate 50 – 75 Hz.

Maximum Pixel Clock 135 MHz

Sync Polarity Independent of sync polarity.

Timing Table

Item Timing Analog Digital

1 640 x 350 @ 70Hz, 31.5kHz Yes Yes

2 640 x 400 @ 60Hz, 31.5kHz Yes Yes

3 640 x 400 @ 70Hz, 31.5kHz Yes Yes

4 640 x 480 @ 50Hz, 24.7kHz Yes No

5 640 x 480 @ 60Hz, 31.5kHz Yes Yes

6 640 x 480 @ 67Hz, 35.0kHz Yes Yes

7 640 x 480 @ 72Hz, 37.9kHz Yes Yes

8 640 x 480 @ 75Hz, 37.5kHz Yes Yes

9 640 x 480 @ 85Hz, 43.27kHz Yes Yes

10 720 x 400 @ 70Hz, 31.5kHz Yes Yes

11 800 x 600 @ 56Hz, 35.1kHz Yes Yes

12 800 x 600 @ 60Hz, 37.9kHz Yes Yes

13 800 x 600 @ 75Hz, 46.9kHz Yes Yes

14 800 x 600 @ 72Hz, 48.1kHz Yes Yes

15 800 x 600 @ 85Hz, 53.7kHz Yes Yes

16 832 x 624 @ 75Hz, 49.7kHz Yes Yes

17 1024 x 768 @ 60Hz, 48.4kHz Yes Yes

18 1024 x 768 @ 70Hz, 56.5kHz Yes Yes

19 1024 x 768 @ 72Hz, 58.1kHz Yes Yes

20 1024 x 768 @ 75Hz, 60.0kHz Yes Yes

21 1024 x 768 @ 85Hz, 68.67kHz Yes Yes

22 1152 x 864 @ 75Hz, 67.5kHz Yes Yes

23 1152 x 870 @ 75Hz, 68.7kHz Yes Yes

24 1280 x 1024 @ 60Hz, 63.4kHz Yes Yes

25 1280 x 1024 @ 75Hz, 79.97kHz Yes Yes

26 1280x 720 @ 60Hz, 45kHz (HDTV) Yes Yes

ViewSonic Corporation Confidential - Do Not Copy VX912-4

TFT LCD PANEL

1st Source Panel

Model number HSD HSD190ME13-D10

Type TN type with LVDS interface

Active Size 376.3 (H) x 301.1 (V)

Pixel Arrangement RGB Vertical Stripe

Pixel Pitch 0.294 mm

Glass Treatment Anti Glare (Hard coating 3H)

# of Backlights 4 CCFL edge-light (2 top / 2 bottom)

Backlight Life 40000 Hours (Min)

Luminance (Center) –

Condition:

CT = 6500K, Contrast = Max,

Brightness = Max

300 cd/m2 (Typ after 30 minute warm up)

240 cd/m2 (Min after 30 minute warm up)

Brightness Uniformity 70% (min)

δW = Max Luminance of 9 points/Min Luminance of 9

points

Contrast Ratio 700:1 (typ), 450:1 (min)

Color Depth 16.2 million colors (6 bits + 2 bits FRC)

Viewing Angle (Horizontal) @ CR>10

Typical: 150

Minimum: 130

@ CR>5

Typical: 160

Minimum: N/A

Viewing Angle (Vertical) @ CR>10

Typical: 135

Minimum: 115

@ CR>5

Typical: 150

MINIMUN: N/A

Response Time

10%-90% @ Ta=25°C

5 ms (Tr= 1,5 ms, Tf = 3.5 ms) (typ)

10 ms (Tr= 3 ms, Tf = 7 ms) (max)

Panel Defects Please see Panel Quality Specifications.

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