ViewSonic VX800-3 Service Manual - Page 20

Analog Timing Mode Table 1 2 3 4 5 6 7 Signal name symbol TEXT TEXT VGA MAC-II VESA-VGA VESA-VG VESA-VG mode mode A A 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 Thd 800 900 800 864 840 832 832 (H-total) 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 Tvd 449 449 525 525 500 520 509 (V-total) V-front porch Tvf 37 12 10 3 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) 350 400 480 480 480 480 480 8 9 Signal name Symbo IBM-8514A SVGA l H-frequency (kHz) 35.156 37.879 V-frequency (Hz) 56.250 60.317 Pixel rate (MHz) 36.000 40.000 H-sync Ths 72 128 H-back porch Thb 128 88 Count num Thd 1024 1056 (H-total) H- front porch Thf 24 40 10 SVGA 11 SVGA 12 SVGA 48.077 72.188 50.000 120 64 1040 46.875 75.000 49.500 80 160 1056 53.674 85.061 56.250 64 152 1048 56 16 32 13 14 MAC 16" XGA 49.725 74.5 57.283 64 224 1152 48.363 60.004 65.000 136 160 1344 32 24 ViewSonic Corporation 26! Confidential - Do Not Copy VX800-3