Service manual

Digital Mode

1 2 3 4 5 6 7

Signal name symbol TEXT

mode

TEXT

mode

VGA VGA VESA-VGA VESA-VGA VESA-VGA

H-frequency (kHz) 31.468 31.469 31.468 31.468 37.5 37.862 43.269

V-frequency (Hz) 70.087 70.087 70.000 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

8 9 10 11 12 13 14

Signal name Symbo

IBM-8514A SVGA SVGA SVGA SVGA XGA XGA

H-frequency (kHz) 35.156 37.879 48.077 46.875 53.674 48.363 56.476

V-frequency (Hz) 56.250 60.317 72.188 75.000 85.061 60.004 70.069

Pixel rate (MHz) 36.000 40.000 50.000 49.500 56.250 65.000 75.000

H-sync Ths 72 128 120 80 64 136 136

H-back porch Thb 128 88 64 160 152 160 144

Count num (H-total) Thd 1024 1056 1040 1056 1048 1344 1328

H- front porch Thf 24 40 56 16 32 24 24

V-sync Tvs 2 4 6 3 3 6 6

V-back porch Tvb 22 23 23 21 27 29 29

Count num (V-total) Tvd 625 628 666 625 631 806 806

V-front porch Tvf 1 1 37 1 1 3 3

H-sync. Polarity Negative Positive Positive Positive Positive Negative Negative

V-sync Polarity Negative Positive Positive Positive Positive Negative Negative

H-resolution (dots) 800 800 800 800 800 1024 1024

V-resolution (lines) 600 600 600 600 600 768 768

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Do Not Copy VG910s/b