Bally V2337-5 graphics problem.

[wrkey]

I've had this machine in my warehouse for years now and since I've recently picked up a few slots and have been working on those I pulled it back out.  This is a Bally V2337-5 and has a unique graphics problem.  I'm pretty sure this isn't a monitor problem but I've been fooled before.   I'm thinking a graphics ROM or VRAM issue of some type.   Anyone seen this before and can give me an idea on where to look on making it display correctly?  There are 2 photos of the scrambled screen as it shows that it changes when I press the diagnosis button so the computer is at least trying to work.

[shortrackskater]

Not a Bally Video TwentyOne, which is the topic here, where you posted. 
Topic split and new one created.