Service manual

V-sync Polarity Negative
Negative
Negative Positive Positive
H-resolution(dots) 640
640
800 800 800
V-resolution(lines) 480
480
600 600 600
mode 11 12 13 14 15
signal name symbol SVGA
SVGA
MAC 16" XGA XGA
H-frequency(khz) 46.875
53.674
49.725 48.363 56.476
V-frequency(hz) 75
85.061
74.5 60.004 70.069
Pixel rate(mhz) 49.5
56.250
57.283 65 75
H-sync Ths 80
64
64 136 136
H-back porch Thb 160
152
224 160 144
H-total Thd 1056
1048
1152 1344 1328
H- front porch Tv 16
32
32 24 24
V-sync Tvs 3
3
366
V-back porch Tvb 21
27
39 29 29
V-total Tvd 625
631
667 806 806
V-front porch Tvf 1
1
133
H-sync. Polarity Positive
Positive
Negative Negative Negative
V-sync Polarity Positive
Positive
Negative Negative Negative
H-resolution(dots) 800
800
832 1024 1024
V-resolution(lines
)
600
600
624 768 768
mode 16 17 18
19 20
signal name symbo
l
XGA
XGA
XGA SXGA SXGA
H-frequency(khz)
58.099
60.023
68.677 63.981 79.976
V-frequency(hz)
72.082
75.029
84.997 60.02 75.025
Pixel rate(mhz)
78.084
78.75
94.500 108 135
H-sync Ths
136
96
96 112 144
H-back porch Thb
160
176
208 248 248
ViewSonic Corporation
Confidential – Do Not Copy
VG800b
18