vga flat screen monitor jitter
i have an old arcade game with a bad monitor, blown out flyback that is unobtainable. . tough to find a working 13 inch cga unit, and harder to find one compact enough to fit . anyway, ive tried using a cga to vga converter board ( GBS 8200 ), its commonly used and has worked well in the past. im using a 13" vga flat screen .
the vga has horizonal jitter, quite bad. no way to adjust out. somebody suggested plugging a spare vga cable into the vga input on the converter board. that reduced it 90%, but on a reboot its back , and cant get rid of it. the game works nicely when hooked up to a spare 19" cga crt. i also tried a vga crt, same jitter. im thinking the added cable adds a load that stabilizes the horz sync, and maybe there is a way to make it more stable? there is only h sync out, no vert. vertically, there is no jitter thanks |
vga flat screen monitor jitter
On Saturday, August 5, 2017 at 10:37:27 AM UTC-4, wrote:
i have an old arcade game with a bad monitor, blown out flyback that is unobtainable. . tough to find a working 13 inch cga unit, and harder to find one compact enough to fit . anyway, ive tried using a cga to vga converter board ( GBS 8200 ), its commonly used and has worked well in the past. im using a 13" vga flat screen . the vga has horizonal jitter, quite bad. no way to adjust out. somebody suggested plugging a spare vga cable into the vga input on the converter board. that reduced it 90%, but on a reboot its back , and cant get rid of it.. the game works nicely when hooked up to a spare 19" cga crt. i also tried a vga crt, same jitter. im thinking the added cable adds a load that stabilizes the horz sync, and maybe there is a way to make it more stable? there is only h sync out, no vert. vertically, there is no jitter thanks correction. with the spare vga cable, it still is 90% better. the second time i plugged the spare into a second card i had on the bench, like a schmuck. plugging into the right card, and its close |
vga flat screen monitor jitter
On Saturday, August 5, 2017 at 10:48:25 AM UTC-4, wrote:
On Saturday, August 5, 2017 at 10:37:27 AM UTC-4, wrote: i have an old arcade game with a bad monitor, blown out flyback that is unobtainable. . tough to find a working 13 inch cga unit, and harder to find one compact enough to fit . anyway, ive tried using a cga to vga converter board ( GBS 8200 ), its commonly used and has worked well in the past. im using a 13" vga flat screen . the vga has horizonal jitter, quite bad. no way to adjust out. somebody suggested plugging a spare vga cable into the vga input on the converter board. that reduced it 90%, but on a reboot its back , and cant get rid of it. the game works nicely when hooked up to a spare 19" cga crt. i also tried a vga crt, same jitter. im thinking the added cable adds a load that stabilizes the horz sync, and maybe there is a way to make it more stable? there is only h sync out, no vert. vertically, there is no jitter thanks correction. with the spare vga cable, it still is 90% better. the second time i plugged the spare into a second card i had on the bench, like a schmuck. plugging into the right card, and its close i put a 4.7 k resistor in line with the sync and it seems to be fine now, no dummy vga cable needed. i tried different values, 4.7k works well. |
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