Donkey Kong Junior / Popeye and others

t153

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I have a bunch of these boards, the Nintendo double PCB stack with the famous rainbow cable that connects them. The power comes from a regulated ATX power supply (500W) at exactly 5.04V. When turning on the power there's just a faint short sound comming out of the speaker and the picture stays dark - I'm running these boards using mikesarcade nintendo jamma adapter found here http://www.mikesarcade.com/cgi-bin/store.pl?sku=NIN2JAMMA

I've seen there's actually a lot of good information here:http://www.mikesarcade.com/arcade/repairs/dkjr.html and also here: http://www.brasington.org/arcade/tech/dkj/

does anyone have a clue. Might these boards just need a little bit more then 5V?

Cheers.
 
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