Ms pacman problem (red line)

RedlandMan

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I have a red line across the screen at all times. Its not the monitor this is on my bench and another pcb works fine
 

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You have another working board? I'd probably swap the roms out 1 by 1 with the known good ones.....
 
Thanks i looks at that page but didnt think much of it till you pointed it out. Is there a way for me to check the ram or is replacing all 4 my best bet
 
First, try swapping some of the ram that's just under the daughter board, there's 6 or so socketed ram all in a row. Take the first one and the second and swap them, then the second and third, etc. and each time power back on. If the problem changes, then one of those ram is screwed up.

The other 4 they're talking about may be the problems too but they're likely soldered in, so it's easier to check the other ram first.

NOT AN EXPERT, just giving you ideas.
 
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