ViewSonic VA2012W Manuale utente

Model No. VS10859

20” Color TFT LCD Display

Service Manual

ViewSonic

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

VA2012wb

ViewSonic VA2012w

(VA2012w_VA2012wb_SM Rev. 1a Nov. 2005)

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.

Optiquest is a registered trademark of ViewSonic Corporation.

Revision History

ECR Number Description of Changes

EditorRevision SM Editing Date

Initial Release

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1a 11/29/05 BonnieT.

TABLE OF CONTENTS

2. Specification

3. Front Panel Function Control Description

4. Circuit Description

6. Troubleshooting Flow Chart

9. Block Diagram

10. Schematic Diagrams

7. Recommended Spare Parts List

1. Precautions and Safety Notices

5. Adjustment Procedure

8. Exploded Diagram and Exploded Parts List

11. PCB Layout Diagrams

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1. Appropriate Operation

(1) Turn off the product before cleaning.

(2) Use only a dry soft cloth when cleaning the LCD panel surface.

(3) Use a soft cloth soaked with mild detergent to clean the display housing.

(4)Use only a high quality, safety approved AC/DC power cord.

(5)Disconnect the power plug from the AC outlet if the product will not be used for a long period of time.

(6) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD display off.

(7) Do not touch the LCD panel surface with sharp or hard objects.

(8) Do not place heavy objects on the LCD display, video cable, or power cord.

(9) Do not use abrasive cleaners, waxes or solvents for your cleaning.

(10) Do not operate the product under the following conditions:

- Extremely hot, cold or humid environment.

-Areas containing excessive dust and dirt.

- Near any appliance generating a strong magnetic field.

- In direct sunlight.

2. 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 guidelines.

3. Safety Check

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

exposed in such areas as the associated transformer circuits.

4. LCDModule Handling Precautions

4.1 Handling Precautions

(1) Since front polarizer is easily damaged, pay attention not to scratch it.

(2)Be sure to turn off power supply when connecting or disconnecting input connector.

(3)Wipe off water drops immediately. Long contact with water may cause discoloration or spots.

(4) When the panel surface is soiled, wipe it with absorbent cotton or other soft cloth.

(5) Since the panel is made of glass, it may break or crack if dropped or bumped on hard surface.

(6)Since CMOSLSI isusedinthis module, take care of static electricity and ensure human earth when handling.

(7)Do not open or modify the Module Assembly.

(8)Do not press the reflector sheet at the back of the module in any direction.

(9)In the event that a Module must be put back into the packing container slot after it was taken out of the

container, do not press the center of the CCFL Reflector edge. Instead, press at the far ends of the

CFL Reflector edge softly. Otherwise the TFT Module may be damaged.

(10) At the insertion or removal of the Signal Interface Connector, be sure not to rotate or tilt the Interface

Connector of the TFT Module.

1. Precautions and Safety Notices

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(11) After installation of theTFT Module intoan enclosure(LCDmonitor housing, for example), do not twist or

bend the TFT Module even momentarily. When designing the enclosure, it should be taken into consideration

that no bending/twisting forces may be applied to the TFT Module from outside. Otherwise theTFT Module

may be damaged.

(12) The cold cathode fluorescent lamp in the LCD contains a small amount of mercury. Please follow local

ordinances or regulations fordisposal.

(13) The LCD module contains a small amount of materials having no flammability grade. The LCD module

should be supplied with power that complies with the requirements of Limited Power Source

(IEC60950 or UL1950), or an exemption should be applied for.

(14) The LCD module is designed so that the CCFL in it is supplied by a Limited Current Circuit (IEC60950

or UL1950). Do not connect theCCFL to a HazardousVoltage Circuit.

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VA2012w series handling Notice

Correct Method Incorrect method

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Correct Method Incorrect method

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2. Specificationtion

GENERAL specification

Test Resolution & Frequency “1680 X 1050” @ 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-D (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

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

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,

1280 x 720, 1280 x 1024, 1600 x 1200,

1680 x 1050

Exclusions Not compatible with interlaced video

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POWER SUPPLY

Internal Power Supply Part Number: EADP-64CF

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 Output current <10A

Leakage Current 3.5mA (Max) at 254VAC / 60Hz

EFFICIENCY 80 % typical at 115VAC Full Load

Fuse Internal and not user replaceable

Power Dissipation 64 Watts (typ)

Max Input AC Current 1.5 Arms @ 90VAC

INRUSH CURRENT (COLD START) 80 A(max) @230VAC

Power Supply Cold Start

Shall start and function properly when under

full load, with all combinations of input

voltage, input frequency, and operating

temperature

Power Supply Transient Immunity

Shall be able to withstand an ANSI/IEEE

C62.41-1980 6000V 200 ampere ring wave

transient test with no damage

Power Supply Line Surge Immunity Shall be able to withstand 1.5 times nominal

line voltage for one cycle with no damage

Power Supply Missing Cycle Immunity

Shall be able to function properly, without

reset or visible screen artifacts, when ½

cycle of AC power is randomly missing at

nominal input

Power Supply Acoustics

The power supply shall not produce audible

noise that would be detectable by the user.

Audible shall defined to be in compliance

with ISO 7779 (DIN EN27779:1991) Noise

measurements of machines acoustics.

Power Switch noise shall not be considered

US Type Power Cable

Separate 3-prong NEMA 5-15P type plug.

Length = 1.8m. Connects to AC/DC Power

Adapter. Color = Black

European Type Power Cable Schuko CEE7-7. Length = 1.8m, Connects

to AC outlet. Color = Black

Power Saving Operation(Method) VESA DPMS Signaling

Power Consumption ON Mode < 50 W (max) / 47 W (typ)

ACTIVE OFF < 2W

Recovery Time ON MODE = N/A, ACTIVE OFF < 3 SEC

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ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Horizontal Frequency ANALOG: 30 – 94 KHZ

DIGITAL : 30-82 KHZ

Vertical Refresh Rate 50 – 75 HZ.

Maximum Pixel Clock Analog: 205 Mhz

Digital: 165 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 @ 70Hz, 31.5kHz Yes Yes

3. 640 x 480 @ 60Hz, 31.5kHz Yes Yes

4. 640 x 480 @ 67Hz, 35.0kHz Yes Yes

5. 640 x 480 @ 72Hz, 37.9kHz Yes Yes

6. 640 x 480 @ 75Hz, 37.5kHz Yes Yes

7. 720 x 400 @ 70Hz, 31.5kHz Yes Yes

8. 720 x 480i 59.94/60Hz @ 15.7 kHz Yes Yes

9. 720 x 576p 50Hz @ 31.25kHz Yes Yes

10. 720 x 576i 50Hz @ 15.62kHz 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. 832 x 624 @ 75Hz, 49.7kHz Yes Yes

16. 1024 x 768 @ 60Hz, 48.4kHz Yes Yes

17. 1024 x 768 @ 70Hz, 56.5kHz Yes Yes

18. 1024 x 768 @ 72Hz, 58.1kHz Yes Yes

19. 1024 x 768 @ 75Hz, 60.0kHz Yes Yes

20. 1280x720p 50Hz @ 37.5kHz Yes Yes

21. 1280x 720 @ 60Hz, 45kHz Yes Yes

22. 1280 x 1024 @ 60Hz, 63.4kHz Yes Yes

23. 1280 x 1024 @ 75Hz, 79.97kHz Yes Yes

24. 1600 x 1200 @ 60Hz, 75kHz Yes Yes

25. 1600 x 1200 @ 70Hz, 87.5kkHz Yes No

26. 1600 x 1200 @ 75Hz, 93.8kHz Yes No

27. 1680 x 1050 @ 60Hz, 65.3 kHz Yes Yes

28. 1680 x 1050 @ 75Hz, 82.3 kHz Yes No

29. 1920 x 1080i @ 50Hz, 56.5kHz Yes Yes

30. 1920 x 1080p @ 50Hz, 62.5kHz Yes Yes

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