Galaxian Board Issue

tatom

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My Galaxian is flashing 2 screen one just has junk on it and then if flashes to a black screen with BBDDRRMM on it. The 2 screen just swithch back and forth. Any ideas what to check?
 
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I would check voltages on the board first and then the reset line on the CPU second.

Usually something to do either with program but most often power. Feel around for hot chips; I find that a shorted chip will usually cause screen to flash, but not usually like that (from one to another). Worth checking though.
 
Thats the self test trying to report either a bad ram or bad rom. I would start by verifying the program roms, check their sockets and the sockets for the rom board.
 
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