Graphic problem on Gunsmoke

cabsR4pimps

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I was wondering if anyone knows how to fix this?
I have reseated and checked all the rom and checked for the proper voltage on the power supply.
It seems like some of the character graphic stays stuck on all the screens. After the wanted posters more parts of the gunman are on the screen.
Here's some pictures.
DSC06968.jpg

DSC06979.jpg

DSC06980.jpg

DSC06978.jpg

DSC06974.jpg
 
You cant assume that because it passes the RAM/ROM tests that all the RAM is ok, in in many cases the test only tests some of the RAM on the board.

My money would be on a fault with the Sprite RAM but you would be hard pressed to rule it out without a scope.
 
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