Tempest Spike Issues?

FlashbackArcade

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My Tempest began to act strange this morning. When the game starts my display goes crazy and the spikes are all over the place! I unplugged the machine for 10 minutes and the problem disappeared for a few games but eventually returned once again. After unplugging it, the game played fine for a few games and then the problem returned once again. No problems when I run the test mode on the game at all. Anyone have an idea what is going on with my machine? I just had the 6100 redone so I'm thinking that I have a board problem but would appreciate any insight that you guys could give me.

Thanks for the help!
 
I had a somewhat similar problem and dropped the board off to a local friend to repair for me. My Tempest usually breaks down every couple of years with some random board problem. The game is one of the all time greats but the machine is a ticking time bomb unfortunately.
 
The header pins on the connectors that join the two boards are notorious for bad solder joints. Start there and then reseat all the socketed ICs.
 
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