Service manual

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31!
H-sync. Polarity Negative Negative Positive Positive Positive Positive Negativ
e
V-sync Polarity Negative Negative Positive Positive Positive Positive Negativ
e
H-resolution (dots) 1024 1024 1024 1024 1280 1280 1280
V-resolution (lines) 768 768 768 768 1024 1024 720
Digital timing mode table
1 2 3 4 5 6 7
Signal name symb
ol
TEXT
mode
TEXT
mode
VGA VGA VESA-V
GA
VESA-V
GA
VESA-V
GA
H-frequency (kHz) 31.468 31.469 31.468 31.468 37.5 37.862 43.269
V-frequency (Hz) 70.087 70.087 60.000 59.941 75 72.807 85.005
Pixel rate (MHz) 25.175 28.322 25.175 25.175 31.5 31.501 36.000
H-sync Ths 96 108 96 96 64 40 56
H-back porch Thb 48 54 48 48 120 128 80
Count num
(H-total)
Thd 800 900 800 800 840 832 832
H- front porch Thf 16 18 16 16 16 24 56
V-sync Tvs 2 2 2 2 3 3 3
V-back porch Tvb 60 35 35 33 16 28 25
Count num
(V-total)
Tvd 449 449 449 525 500 520 509
V-front porch Tvf 37 12 10 6 1 9 1
H-sync. Polarity Positive Negative Negative Negative Negative Negative Negative
V-sync Polarity Negative Positive Negative Negative Negative Negative Negative
H-resolution (dots) 640 720 640 640 640 640 640
V-resolution (lines) 350 400 400 480 480 480 480
ViewSonic Corporation
Confidential – Do Not Copy VX700-3