Service manual
ViewSonic Corporation Confidential - Do Not Copy
7
5. ELECTRICAL REQUIREMENT
Horizontal / Vertical Frequency
Horizontal Frequency
30 – 82 kHz
Vertical Refresh Rate
56 – 75 Hz
Maximum Pixel Clock 135 MHz
Sync Polarity Independent of sync polarity
Timing Table
Analog
Item
Timing
Separated
Composite
SOG
Digital - TMDS
Remark
1 640 x 350 @ 70 Hz, 31.5 KHz
For Analog sync, the image vertical size image
will be not full screen (Still at the center)
2 640 x 400 @ 60 Hz, 31.5 KHz
For Analog sync, the OSD will be
640x480@60Hz
3 640 x 400 @ 70 Hz, 31.5 KHz
For Analog sync, the image vertical size image
will be not full screen (Still at the center), And the
OSD will be 640x400/720x400 (primary=
720x400).
4 640 x 480 @ 50 Hz, 24.7 KHz
5 640 x 480 @ 60 Hz, 31.5 KHz
6 640 x 480 @ 67 Hz, 35 KHz
7 640 x 480 @ 72 Hz, 37.9 KHz
8 640 x 480 @ 75 Hz, 37.5 KHz
9 640 x 480 @ 85 Hz, 43.3 KHz
10 720 x 400 @ 70 Hz, 31.5 KHz
For Analog sync, the image vertical size image
will be not full screen (Still at the center), And the
OSD will be 640x400/720x400 (primary=
720x400).
11 720 x 480 @ 60 Hz, 31.5 KHz
For Analog sync, the information OSD shows
640x480
12 720 x 576 @ 50 Hz, 31.3 KHz
13 800 x 600 @ 56 Hz, 35.1 KHz
14 800 x 600 @ 60 Hz, 37.9 KHz
15 800 x 600 @ 72 Hz, 48.1 KHz
16 800 x 600 @ 75 Hz, 46.9 KHz
17 800 x 600 @ 85 Hz, 53.7 KHz
18 832 x 624 @ 75 Hz, 49.7 KHz
19 1024 x 768 @ 50 Hz, 39.6 KHz
For Analog sync, Switch 1024x768@50Hz and
1280x768@50Hz by [1]+[2] short cut key
VX1935wm-3