PGM2 Sound Issues - Fuzz/White Noise

egg_sanwich

Windjammers Wonder
10 Year Member
Joined
Oct 9, 2012
Posts
1,379
So I just got a DDPDOJT PGM2 cart with motherboard and am having some sound issues. There is pronounced white noise/fuzz coming through the speakers (think poor fm radio reception), and the sound occasionally breaks up and crackles.

The full music and sound effects of the game come through fine, so I'm thinking it may be an issue with the mobo. The volume knob on the side doesn't have much effect on the overall volume - it only goes slightly louder or slightly less quiet. When the knob is at the lowest volume, the white noise is even louder.

I don't have another mobo to test at the moment, but here's what I tried so far:
- Clean jamma edge connector
- Reseat cart on mobo
- Check for bent cart pins
- Visually inspect pcbs for damage, none found
- Tested on my supergun, friend's Blast City, friend's supergun, problem persists

Has anyone seen this before? Does it sound like a mobo on its last legs? Any other troubleshooting steps to suggest?
 
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