Sinistar Sync issue?

prOk

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Ok, so I think i'm past my 4900 in my sinistar being my problem.

Put in a brand new monitor and the problem is the same.. not quite as severe but it's there for sure. So, now i'm thinking it's the board. So, has anyone seen this problem before that could point out what is wrong before I go on a hunting trip to find it :)

Essentially, I have foldover on both axes (axis?) horizontal and vertical. I thought previously it was my 4900 monitor but after the changeout I realize it's not and need to look elsewhere.

Thanks :)
/b
 
You can check the circuit that generates the syncs. Specifically the 7474 at 6C and the gates at 3A (7411 - pins 8 & 12), 4C (7421 - pin 8) and 4A (7486 - Pins 3, 6, 11 & 8).

Also you might want to reflow the video header.

ken
 
pr0k, if you don't feel safe pulling/removing those's ics, i have plenty of them here, and will be home on Monday.
 
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