Moon patrol pcb help

blkdog7

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Donor 2011
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I have (2) Moon Patrol PCBs.

They are both doing odd things:

Board 1: The UFO sprites are messed up. Especially the one that drops the crater bomb. Every other frame shows garbage. And, the bombs are screwy looking on a frame.

Board 2: The background sprites blink and flash and often get replaced with a solid colored rectangle

Do you know what board in the stack would cause each of the above? I was thinking I could combine both boards to make a perfect working one but am not sure what combination I should be using. Or, could this be something else?

I have reseated chips, harnesses, etc.

I am using the high score save kit. If I remove it, I have the same issue. So, it's not the ROMs as these are replaced by the high score save kit. And, if I put the original roms back in I have the same issue.

I am using a switcher kit. I am getting a perfect 5V out of the switcher. I also tried it at +5.1v. Same issue.

Thanks!
 
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