Qbert video interference

LyonsArcade

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Hi guys;
I've got a Qbert I've been working on, and was able to get it up and running with Riptor's great power supply kit.

Anyways, everything's great, but when the game makes sound, there's noise showing up on the screen. Vertical lines, etc. like interference. It's only while the sound is actually playing, if everything's quiet it's fine.

I've recapped the sound board, reseated and cleaned all the connectors, made sure the main board is getting 5v, rebuilt the power supply, reflowed everything on the filter board...

Any ideas? If I disconnect the sound board, the game plays great with no interference.
 
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