ViewSonic VX800-3 Service Manual - Page 22

Digital Timing Mode Table 1 2 3 4 5 6 7 Signal name symbol TEXT TEXT VGA VGA VESA-VG VESA-VG VESA-VG mode mode A A A 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 H-sync 96 Ths 96 108 96 64 48 H-back porch Thb 48 54 48 120 Count 800 num Thd 800 900 800 840 31.501 40 128 832 36.000 56 80 832 (H-total) 16 H- front porch Thf 16 18 16 16 24 56 V-sync 2 Tvs 2 2 2 3 3 3 35 V-back porch Tvb 60 35 33 16 28 25 Count 449 num Tvd 449 449 525 500 520 509 (V-total) 10 V-front porch Tvf 37 12 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 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 48.077 72.188 50.000 120 64 1040 56 11 SVGA 46.875 75.000 49.500 80 160 1056 16 12 SVGA 53.674 85.061 56.250 64 152 1048 32 13 XGA 48.363 60.004 65.000 136 160 1344 24 14 XGA 56.476 70.069 75.000 136 144 1328 24 ViewSonic Corporation 28 Confidential - Do Not Copy VX800-3