IT World Class Bowling Deluxe PCB Help

Phetishboy

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I have this board in my multi trackball unit and haven't had a problem til recently. I am running 3 boards thru a jammaboards 6 in 1 switcher so the voltage always shows as 'low' on all 3 games. I have the 5V cranked on the PSU and have run a separate 5V line to the trackball, it still shows 'low'. A few weeks ago this game wouldn't boot, but the other 2, Shuffleshot and GT2K booted just fine. I removed the edge connector and the jamma ext harness to the WCB Deluxe PCB, cleaned them, put them back and the game fired right up. Worked fine for a few weeks but now I am having video corruption on the title and game selection screens, even in attract mode. The words are all blurred/scrambled and the screen looks like it has radio interference lines running thru it like an old TV running off of an aerial antenna during a thunderstorm. Once you select your game and number of players, the game plays fine with no corruption. What could be causing the video corruption in the title and game selection screens?
 
If thats a switcher, the switcher could be acting up and putting out noise. If you have a spare I'd try swapping that first. If not, its possible you have a bad ground somewhere.
 
If thats a switcher, the switcher could be acting up and putting out noise. If you have a spare I'd try swapping that first. If not, its possible you have a bad ground somewhere.

It's a big Peter Chou ATX PSU, complete with cooling fan.
 
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