ViewSonic VA2012w-2 Manuale utente

ViewSonic VA2012w-2

VA2012wb-2

Model No. VS10859

20” Color TFT LCD Display

(VA2012w-2_VA2012wb-2_SM Rev. 1aJun. 2006)

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

Service Manual

ViewSonic Corporation Confidential - Do Not Copy VA2012w-2_VA2012wb-2

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 6/19/2006 Initial Release J. Chang

ViewSonic Corporation Confidential - Do Not Copy VA2012w-2_VA2012wb-2

TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 4

3. Front Panel Function Control Description 10

4. Circuit Description 12

5. Adjustment Procedure 25

6. Troubleshooting Flow Chart 50

7. Recommended Spare Parts List 53

8. Exploded Diagram and Exploded Parts List 58

9. Block Diagram 62

10. Schematic Diagrams 63

11. PCB Layout Diagrams 70

ViewSonic Corporation Confidential - Do Not Copy VA2012w-2_VA2012wb-2

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

Take out the monitor with cushion

correct method

Place the monitor on a clean & soft foam pad

Surface of the panel is pressed by fingers &

this may cause “ MURA “

Do not touch the surface of the polarizer .

incorrect method

Take out the monitor by grasping the LCD

panel. That may cause “ MURA“.

could

scratch the surface of panel

Handing and Placing Methods

ViewSonic Corporation Confidential - Do Not Copy VA2012w-2_VA2012wb-2

when assemble&disassembly

bezel

when assemble&disassembly

bezel

when assemble&disassembly

bracket

when assemble&disassembly

bracket

ViewSonic Corporation Confidential - Do Not Copy VA2012w-2_VA2012wb-2

2. Specification

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 N/A

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)—N/A

Video Impedance 75 Ohms (Analog)

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

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

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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 ofAC 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 outlet. 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

ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Horizontal Frequency Analog: 30 – 94 kHz

Vertical Refresh Rate 50 – 75 Hz.

Maximum Pixel Clock Analog: 205 Mhz

Sync Polarity Independent of sync polarity.

Timing Table

Item Timing Analog Digital

1 640 x 350 @ 70Hz, 31.5kHz Yes N/A

2 640 x 400 @ 70Hz, 31.5kHz Yes N/A

3 640 x 480 @ 60Hz, 31.5kHz Yes N/A

4 640 x 480 @ 67Hz, 35.0kHz Yes N/A

5 640 x 480 @ 72Hz, 37.9kHz Yes N/A

6 640 x 480 @ 75Hz, 37.5kHz Yes N/A

7 720 x 400 @ 70Hz, 31.5kHz Yes N/A

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

9 720 x 576p 50Hz @ 31.25kHz Yes N/A

10 720 x 576i 50Hz @ 15.62kHz Yes N/A

11 800 x 600 @ 56Hz, 35.1kHz Yes N/A

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12 800 x 600 @ 60Hz, 37.9kHz Yes N/A

13 800 x 600 @ 75Hz, 46.9kHz Yes N/A

14 800 x 600 @ 72Hz, 48.1kHz Yes N/A

15 832 x 624 @ 75Hz, 49.7kHz Yes N/A

16 1024 x 768 @ 60Hz, 48.4kHz Yes N/A

17 1024 x 768 @ 70Hz, 56.5kHz Yes N/A

18 1024 x 768 @ 72Hz, 58.1kHz Yes N/A

19 1024 x 768 @ 75Hz, 60.0kHz Yes N/A

20 1280x720p 50Hz @ 37.5kHz Yes N/A

21 1280x 720p @ 60Hz, 45kHz Yes N/A

22 1280 x 1024 @ 60Hz, 63.4kHz Yes N/A

23 1280 x 1024 @ 75Hz, 79.97kHz Yes N/A

24 1600 x 1200 @ 60Hz, 75kHz Yes N/A

25 1600 x 1200 @ 70Hz, 87.5kkHz Yes N/A

26 1600 x 1200 @ 75Hz, 93.8kHz Yes N/A

27 1680 x 1050 @ 60Hz, 65.3 kHz Yes N/A

28 1680 x 1050 @ 75Hz, 82.3 kHz Yes N/A

29 1920 x 1080i @ 50Hz, 56.5kHz Yes N/A

30 1920 x 1080p @ 50Hz, 62.5kHz Yes N/A

Primary Presets

“1680 x 1050” @ 60Hz

User Presets

Number of User Presets (recognized timings) Available: 10 presets total in FIFO configuration

Changing Modes

zMaximum Mode Change Blank Time for image stability : 3 seconds (Max), excluding “Auto Adjust” time

zUnder DOS mode (640 x 350, 720 x 400 & 640 x 400), it should recall factory setting when execute

“Auto Adjust”

zThe monitor needs to do “Auto Adjust” the first time a new mode is detected

z(see section “0-Touch™ Function Actions”)

zWhile running Change Mode, Auto Adjust or Memory Recall, the image shall blank

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AUDIO INTERFACE (SPEAKER SPECIFICATION)

Line input connection 3.5 mm stereo jack

Line input signal 1.3 Vrms

Line input impedance 10 kOhm

Maximum power output (Electric) 1 W @ < 5% distortion

Signal to Noise Ratio 72 dB

Frequency response 200 Hz – 20 Khz

Distortion < 5 % THD (@1kHz)

Vibration There should be no audible 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

Panel Characteristics:

1st Source Panel QDI QD20AL01

Type TN Technology”

Active Size 433.44 (H) x 270.9 (V)

Pixel Arrangement RGB Vertical Stripe

Pixel Pitch 0.258 mm

Glass Treatment Anti Glare (Hard coating 3H)

# of Backlights 6 CCFL edge-light (3 top / 3 bottom)

Backlight Life 40,000 Hours (Min)

Luminance – 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 77 % Entire Area (typ)

Contrast Ratio 600:1 (Typ), 400:1 (Min)

Color Depth 16.2 million colors (6 bit panel)

Viewing Angle (Horizontal) 140 deg @ CR>10, 160 deg @ CR>5

Viewing Angle (Vertical) 125 deg @ CR>10, 140 deg @ CR>5

Response Time

10%-90% @ Ta=25°C

8 ms (Tr= 2 ms, Tf = 6 ms) (Typ)

16 ms (Tr= XXX ms, Tf = XXX ms) (Max)

Panel Defects Please see Panel Quality Specifications.

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