Service manual

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29!
Analog timing mode table
1 2 3 4 5 6 7
Signal name symb
ol
TEXT
mode
TEXT
mode
VGA MAC-II VESA-VG
A
VESA-V
GA
VESA-V
GA
H-frequency (kHz) 31.468 31.469 31.468 35.001 37.5 37.862 43.269
V-frequency (Hz) 70.087 70.087 59.941 66.667 75 72.807 85.005
Pixel rate (MHz) 25.175 28.322 25.175 30.240 31.5 31.501 36.000
H-sync Ths 96 108 96 64 64 40 56
H-back porch Thb 48 54 48 96 120 128 80
Count num
(H-total)
Thd 800 900 800 864 840 832 832
H- front porch Thf 16 18 16 64 16 24 56
V-sync Tvs 2 2 2 3 3 3 3
V-back porch Tvb 60 35 33 39 16 28 25
Count num
(V-total)
Tvd 449 449 525 525 500 520 509
V-front porch Tvf 37 12 10 3 1 9 1
H-sync. Polarity Positive Negative Negative Negativ
e
Negative Negativ
e
Negativ
e
V-sync Polarity Negative Positive Negative Negativ
e
Negative Negativ
e
Negativ
e
H-resolution (dots) 640 720 640 640 640 640 640
V-resolution (lines) 350 400 480 480 480 480 480
8 9 10 11 12 13 14
Signal name Symb
ol
IBM-851
4A
SVGA SVGA SVGA SVGA MAC
16"
XGA
H-frequency (kHz) 35.156 37.879 48.077 46.875 53.674 49.725 48.363
V-frequency (Hz) 56.250 60.317 72.188 75.000 85.061 74.5 60.004
Pixel rate (MHz) 36.000 40.000 50.000 49.500 56.250 57.283 65.000
H-sync Ths 72 128 120 80 64 64 136
H-back porch Thb 128 88 64 160 152 224 160
ViewSonic Corporation
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