Double Dragon Sound Issue Interference

troxel

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Donor 7 years: 2015-2021
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Working on a project DD pcb, and got the graphics and sound working fine. The problem is if there is a digital sound there is interference with the game. Everything works fine until there is a digital sound then the screen gets slightly scrambled for a second and then back to normal. Not sure where to look to trouble shoot this.

Any advice?

I can take a video of it here in a bit.
 
Usually video interferences are due problem on +12V line which affects also the video, most of time they are cause by capacitors with increased ESR.Maye in this case there was a problem in -5V line used by OP-AMPs.
 
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