Tron graphic noise

Paladin

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Working on a Tron boardset with a tested good video and sound board. This video shows the pixel 'noise' I'm getting. The game seems to play fine, but has lots of extra flashing pixels.

I've been swapping boards and EPROM's between a few boards, and there appears to be fewer pixels when I swap out the EPROM's my friend burned for the original ones on my other CPU board.

Any ideas what to look for? Unfortunately I'm not really set up for board repair other than swapping parts around. I can solder, but don't have a logic probe or any other PCB testing equipment.
 
Tried swapping the 6116 on the CPU board with no change. Tried cleaning the legs of the BG EPROM's, no change. Next up, cleaning the other EPROM's on the board.
 
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