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Prehistoric Isle in 1930, power shorted out
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Question
Anthony Flack
I have a Prehistoric Isle in 1930 which I found abandoned in a gutted cabinet. I don't have a working monitor to test it with yet, but when I attached it to a JAMMA harness and speaker, it started playing music like it was working.
At first.
A couple of minutes later, the power supply is ticking and the ground wire on the harness has started melting! I guess the +5v line has shorted to ground. The board won't work any more.
I'm not reading an outright short between +5 and ground, resistance is 238ohm. There is a power LED which is simply connects between +5 and ground via a resistor, that won't come on any more. Well, I'm hoping the power is just going to ground and no chips have been damaged. Nothing but the ground wire got hot at least.
The first thing the power hits is smoothing capacitors connected to ground. No doubt they are ancient and need replacing anyway. Is one of these likely to be the culprit though?
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