Service manual

ViewSonic Corporation Confidential - Do Not Copy VA902-3_VA902b-3
4
2. Specification
1. General Requirements
General Specifications
Test Resolution & Frequency “1280 x 1024” @ 60Hz
Test Image Size Full Size
Contrast and Brightness Controls Factory Default:
Contrast = 70%, Brightness = 100%
2. Signal Interface
Video Interface
Analog Input Connector DB-15 (Analog)
Default Input Connector Defaults to the first detected input
Video Cable Connector DB-15 Pin out Compliant DDC 1/2B.
Video Signals 1. Video RGB (Analog) Separate Sync
Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)
Exclusions Not compatible with interlaced video.
3. Power
Power Supply
Input Voltage Range 90 to 264 VAC
Power Dissipation 40 Watts (Typ.)
4. Electrical Requirements
Horizontal / Vertical Frequency
Horizontal Frequency 30 – 80 KHz
Vertical Refresh Rate 50 – 75 Hz
* For resolution 1280 x 1024, the vertical
Refresh rate up to 75 Hz; for there rest
Resolutions, the vertical refresh rate up
To 75Hz.
Maximum Pixel Clock 135 MHz.
Sync Polarity Independent of sync polarity.
Timing Table
Item Timing Analog
1 640 x 350 @ 70Hz, 31.5kHz Yes
2 640 x 400 @ 60Hz, 31.5kHz Yes
3 640 x 400 @ 70Hz, 31.5kHz Yes
4 640 x 480 @ 50Hz, 24.7kHz Yes
5 640 x 480 @ 60Hz, 31.5kHz Yes
6 640 x 480 @ 67Hz, 35.0kHz Yes
7 640 x 480 @ 72Hz, 37.9kHz Yes
8 640 x 480 @ 75Hz, 37.5kHz Yes
9 640 x 480 @ 85Hz, 43.27kHz Yes
10 720 x 400 @ 70Hz, 31.5kHz Yes
11 800 x 600 @ 56Hz, 35.1kHz Yes
12 800 x 600 @ 60Hz, 37.9kHz Yes
13 800 x 600 @ 75Hz, 46.9kHz Yes
14 800 x 600 @ 72Hz, 48.1kHz Yes
15 800 x 600 @ 85Hz, 53.7kHz Yes
16 832 x 624 @ 75Hz, 49.7kHz Yes
17 1024 x 768 @ 60Hz, 48.4kHz Yes
18 1024 x 768 @ 70Hz, 56.5kHz Yes
19 1024 x 768 @ 72Hz, 58.1kHz No
20 1024 x 768 @ 75Hz, 60.0kHz Yes
21 1024 x 768 @ 85Hz, 68.67kHz Yes
22 1152 x 864 @ 75Hz, 67.5kHz No