Donkey Kong video issue

wontwa

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Apr 1, 2010
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Grand Rapids, Michigan
Well, finally got everything working 100% on this thing - then this kicks in. If I turn on the game, everything works and plays fine for about 5 -10 minutes, then the screen starts showing the image shown below. If I turn the game back off and turn on, everything is fine again for another 10 minutes or so. I have the two board set, and recently replaced the main (non video) pcb due to audio issues, so I'd be surprised if it was anything on the video board. Prior to that everything was fine. I've reseated the cables the connect the two boards together. Anyone seen this before?
 

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Yes, you need to recap the monitor. You may be able to adjust it out for a little while, but it will be back. Adjust the H Hold on the chassis approx 2 inches above (forward of) the flyback.
 
There are pots on the game board that adjust the horizontal and vertical position of the picture. If one goes bad, this can happen. Try pressing on them and wiggling them and see if there is any effect.

-Ian
 
Yeah, I ran accross something similar once:

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Tweaking the horizontal sync adjustment pot took care of it for me.
 
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