ViewSonic VX2025wm-1 Manuale utente

ViewSonic VX2025wm-1

Model No. VS10859

20” Color TFT LCD Display

(VX2025wm-1_SM Rev. 1b Sep. 2006)

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

Service Manual

ViewSonic Corporation Confidential -Do Not Copy VX2025wm-1

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 02/16/2006 Initial Release Jamie Chang

1b09/11/2006 VS-E060132 Add 2nd panel source Jamie Chang

ViewSonic Corporation Confidential -Do Not Copy VX2025wm

TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 4

3. Front Panel Function Control Description 9

4. Circuit Description 12

5. Adjustment Procedure 24

6. Troubleshooting Flow Chart 38

7. Recommended Spare Parts List 41

8. Exploded Diagram and Exploded Parts List 44

9. Block Diagram 48

10. Schematic Diagrams 49

11. PCB Layout Diagrams 56

ViewSonic Corporation Confidential -Do Not Copy VX2025wm-1

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 theAC 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 theAC 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

Handing Methods incorrect method

Take out the monitor by grasping the LCD

panel.That may cause “ MURA“.

Place the monitor on foreign objects .That

could scratch the surface of panel

Surface of the panel is pressed by fingers &

this may cause “ MURA “

Do not touch the surface of the polarizer .

Take out the monitor with cushion

correct method

Place the monitor on a clean & soft foam pad

ViewSonic Corporation Confidential -Do Not Copy VX2025wm-1

when assemble&disassembly

bezel

when assemble&disassembly

bezel

when assemble&disassembly

bracket

when assemble&disassembly

bracket

when you get the lcd

monitor

when you get the lcd

monitor

ViewSonic Corporation Confidential -Do Not Copy VX2025wm-1

2. Specification

GENERAL specification

Test Resolution & Frequency 1680x1050 @ 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, 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, 1680 x 1050

* 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

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POWER SUPPLY

Internal Power Supply Part Number: EAPD-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 10 A typical

Leakage Current 3.5mA (Max) at 264VAC / 50Hz

EFFICIENCY 80 % typical at 115VAC Full Load

Fuse Internal and not user replaceable

Power Dissipation 64 Watts (typ)

Max Input AC Current 1.5Arms @ 90VAC

INRUSH CURRENT (COLD START) 80 A @ 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 2000V

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 define 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 display.

Color = Black

European Type Power Cable Schuko CEE7-7 type plug.

Length = 1.8m, Connects to display.

Color = Black

CCC Type Power Cable Separate 3-prong type plug.

Length = 1.8m. Connects to display.

Color = Black

PSE Type Power Cable Separate 2-prong NEMA 1-15P type plug. Length = 1.8m.

Connects to display.

Color = Black

Power Saving Operation(Method) VESA DPMS Signaling

ON Mode < 50W (Max) / 49W (Typ)

Power Consumption On Mode < 50 W (Max) / 49W (Typ)

Saving Mode < 2 W, Off Mode < 1 W

Recovery Time On Mode = N/A, Active Off < 3 sec

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ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Horizontal Frequency 30 – 82 KHZ

Vertical Refresh Rate 50 – 75 HZ

Maximum Pixel Clock Digital: 165 MHz Analog: 205 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 No 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 No No

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 No No

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 No No

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 Yes Yes

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

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

29 1680 x 1050 @ 85Hz, 93.9kHz No No

Primary Presets

1680x1050 @ 60Hz

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

Audio DPMS Speakers stay on when the rest of the monitor is in power saving

Note: There is no guarantee <1 W power consumption in Active

Off mode, when the Audio Cable is connected

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Panel Characteristics:

1st Source Panel

Model number AUO M201EW01 V0

Type PMVA type with LVDS interface

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

BACKLIGHT LIFE 50,000 Hours (Min)

Luminance (5-point) –

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 ≧80% (Typ), 75% (Min),

Contrast Ratio 800:1 (typ), 400:1 (min)

Color Depth 16.7 million colors (8 bits)

Viewing Angle (Horizontal) @ CR>10

Typical: 176º

Minimum: 150º

@ CR>5

Typical: T.B.D

Minimum: T.B.D

Viewing Angle (Vertical) @ CR>10

Typical: 176º

Minimum: 150º

@ CR>5

Typical: T.B.D

Minimum: T.B.D

Response Time

10%-90% @ Ta=25°C

Tr = 25 ms,Tf = 15 ms Total = 40ms (max)

Tr =11 ms,Tf = 5ms Total =16ms(typ)

Without OD Board (gray –gray)

(Average of Tr and Tf) = 8 ms (typ)

Panel Defects Please see Panel Quality Specifications.

Indice

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