Mario Bros - Garbled Display

pinballdirec

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I have the background graphic, but I don't have the characters. Picture is attached. I have cleaned and resetted all the chips on both boards. I have removed and resetted all the cables. Any ideas?
 

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Looks like bad sprite line ram counters or bad ECL level converters.

How do I trouble shoot to find out which one is bad? Are these both one the video board?
 
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