Double Dragon II Revenge - Music works but no sound fx

gum_drops

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Double Dragon II Revenge - Music works but no sound fx

The music works fine but no sound effects at all.

A couple of the caps looked old and one was broken off. I replaced those already.

The volume pot needs replacing as the music wont play sometimes unless the sound pot is turned a little bit. That shouldn't effect the sound fx though right, since the music plays?

I also switched out the 26j6 and 26j7 (sound roms) from my other DD2 board, no change.

Any ideas?

I measured the -5v at about -5.2 off the jamma edge. I have another DD2 board that works fine.
 
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Got PCB repair tools and know how to read a schematic?

Usually these two sets of sounds are generated by different components and then mixed. Someone will have to troubleshoot whether the problem is in the sound effects circuit or the mixing.
 
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