Crazy Space Duel problem!

Braido

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Turned on my games last night and my Space duel was going nuts. Switched out the board for another known working spare i had and it's fine! Let me know if anyone has any idea of what may be wrong with the 1st PCB.

Thanks,

http://www.youtube.com/watch?v=i8PHj4tzV-8
 
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Normally I see those caused by power issues. But since the other board runs.
I would still check the +5 though.

Sounds like it's in going into reset, and rather fast too. So I would start by checking the roms, they tend to walk because of heat cycles.

The Coin counter is getting a signal from R9 LS273 Those inputs are the buffered datalines. So it could be a faulty ram as well.

Hard to say for sure, it could be a stuck input, but you should still have picture.
 
I had a Space Duel PCB have a similar issue and it ended up being a faulty AVG chip.
 
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