Tapper character graphics corruption

80scoinops

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Character graphics are corrupted, but background graphics are fine. Board issue? ROM issue? Where should I start checking for problems?
 
I had a similar problem and it was a bad 93422 Ram on the video board. First replace the cables and reseat all the chips.
 
I had just the bartender with a lot of squiggly lines in him, but after it warmed up, it became only slightly noticeable.

cdjump just did the repair on my board.
 
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