1-Slot Neo Geo MVS sound issues

doesbenfoldfive

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I just got my Neo-MVH 1-slot in the mail and hooked it up to my Jamma Ninja Gaiden cab. The game plays perfectly, but there are sound issues.

(I only have Metal Slug 3 right now and I cleaned the connectors on the cart)
The sound will come and go randomly. Sometimes there are background sounds and you can only hear my gun. Sometimes there is nothing. Sometimes there is everything.

I have the switch set to mono.

What is going on?
 
Neo Geos are notorious for having the audio caps on the PCB go bad over time. i think there are even sites that sell cap kits to replace 'em. might want to start with that.
 
Open the cartridge and clean the edge connectors with a pink pencil eraser.

Be sure to clean the eraser mess up very well before buttoning the cart back up.

You can also flip the stereo/mono switch back & forth a few times but I don't think that's it. Most likely a dirty cart if the op tested the board.
 
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