Demolition Derby 4P cocktail

snapJaw

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Hi guys, here is the deal -

Fixing a demolition derby for a friend. He got it several years ago from a dealer. When it turns on, now it only has some scrambled white blocks on the screen. When he called, I initially thought it was white grid test pattern so I replaced the Z80 - but that wasn't the case.

I checked the power supply - all the voltages seem to be fine (the +5 and +12). The power supply looks like it was recently re-done (probably from whomever bought it) Caps look brand new and the big blues look brand spankin new.

I've concluded it must be a board set issue - and told him he should send it in or I'd see if anyone had one. The only other thing I could think of was to try and replace all of the ribbon cables between the boards.

So -

1)Just wanted to check and see if anyone had any other ideas.
2) Who repairs MCR boards?


Thanks!
 
Is Eldarado games still around? They would probably be able to repair this boardset, wouldn't they?
 
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