Atari Space Duel screen flipping

jm2u

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Hello, I have a Space Duel cocktail that recently started acting up. The screen flips vertically for a split second every now and then. The monitor has likely never been serviced, but is otherwise bright with good color. Is this a pcb issue or a known issue with a WG6100? Thanks'
 
PCB issue. Try reseating the socketed chips. Especially the two Pokeys, which are the two long 40-pin chips next to each other. You most likely have a dirty Pokey socket, or a bad Pokey.

You can also try swapping the Pokeys, and see if that changes the problem.

Also, check to see if you are getting any error codes in test mode. See the manual for more.
 
Thanks so much for the help. I'll pull the board and check these ICs. This machine is pretty minty. I think the board still has shipping blocks around it.
 
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