Galaxian Video Issue

jimk

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I'm troubleshooting a video issue on a Galaxian I picked up a little while back. Anyone encounter this issue before and do you recall the fix? Any ideas what could be the cause?

Thanks
 

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The first thing I do with a galaxian board is swap the 2 proms @ 1H + 1K with eproms they can cause issues if 1 of them is bad. That or the 27LS00's on line 1 can cause odd issues with the invaders if they are socketed swap them around and see if the problem changes.
The galaxian boards have problems with the corroded prom legs and sockets also.
Also make sure, if someone else has worked on the board, they didn't install something backwards or wrong.
 
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