Williams MPU problems

YellowDog

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Donor 2011, 2013
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I have been working on a pile of dead Williams boards and came across this problem on a board I brought back from the dead. It passes the RAM test, but the screen has bands that are replicated.

Before I start shotgunning the addressing chips I thought I would ask here if anybody had seen this before and what they did to fix it.

Thanks.

ken
 

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