Service manual

ViewSonic Corporation Confidential - Do Not Copy VA903b-1_ VA903m-1

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 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

Length = 1.8m. Connects to AC/DC Power Color =

Black

Power Saving Operation (Method) VESA DPMS Signaling

Power Consumption

ON Mode < 36 W (max)

pOWER sAVING < 2W ,OFF < 1W

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

ELECTRICAL REQUIREMENTS

Horizontal / Vertical Frequency

Horizontal Frequency

30 – 82 kHz

Vertical Refresh Rate

50 – 85 Hz.

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 480 @ 50Hz, 24.68KHZ Yes

3 640 x 480 @ 60Hz, 31.5kHz Yes

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

5 640 x 480 @ 72Hz, 37.9kHz Yes

6 640 x 480 @ 75Hz, 37.5kHz Yes

7 640 x 480 @ 85Hz, 43.27kHz Yes

8 720 x 400 @ 70Hz, 31.5kHz Yes

9 800 x 600 @ 56Hz, 35.1kHz Yes

10 800 x 600 @ 60Hz, 37.9kHz Yes

11 800 x 600 @ 72Hz, 48.1kHz Yes