Neo geo MVS sound issues

[iankellogg]

So I got my first arcade machine and it's a neo geo 4 slot. Unit is in pretty decent condition with a beautiful monitor and working audio... Kindof. The audio works just fine during boot and all game music works for all 4 games I have. But certain audio effects don't work in the game. For example, samurai shodown plays the music but none of the fighting sound effects play. Anyone thoughts?

[John's Arcade]

So I got my first arcade machine and it's a neo geo 4 slot. Unit is in pretty decent condition with a beautiful monitor and working audio... Kindof. The audio works just fine during boot and all game music works for all 4 games I have. But certain audio effects don't work in the game. For example, samurai shodown plays the music but none of the fighting sound effects play. Anyone thoughts?

That's a tough one, maybe.

First things first, I'd try reseating all the carts and maybe mix them up a little bit. You can clean them here:

http://hardmvs.com/html/slotCleaning.htm

Next, you might want to cap the audio section on your PCB. My NEO GEO had audio issues when I got it and replacing the caps fixed it. This is a VERY common issue.:

http://www.arcadecomponents.com/f/Neo_Geo_Cap_Kits.pdf

[iankellogg]

Yeah from my research it seems to be caps. Interesting part is that baseball stars works perfectly in it. Everything else is either without sound or music only.

[iankellogg]

Been doing tons of research and doing my best to understand the really old schematics for the neo geo. For my issue it is most likely not an audio cap issue. I may still do an audio cap kit just since the ma chine is 20 years old.

From what I can tell the issue is most likely a YM2610 chip issue. All 4 slots and all 4 games have the same issue with the audio, music and coin/menu sounds work but nothing else does. From what I can figure, the chip is bad and the ADPCM sounds are not coming through. I might pull the board out again and probe it to make sure it isn't one of the mux chips. Thought I would post this to maybe help someone else someday.

[arcade renaissance]

Been doing tons of research and doing my best to understand the really old schematics for the neo geo. For my issue it is most likely not an audio cap issue. I may still do an audio cap kit just since the ma chine is 20 years old.

From what I can tell the issue is most likely a YM2610 chip issue. All 4 slots and all 4 games have the same issue with the audio, music and coin/menu sounds work but nothing else does. From what I can figure, the chip is bad and the ADPCM sounds are not coming through. I might pull the board out again and probe it to make sure it isn't one of the mux chips. Thought I would post this to maybe help someone else someday.

Please do let us know what you find!

[iankellogg]

I'm still waiting on the yahama chip. I got a bunch of games since then and still the same issues in all 4 slots. Some games have voice and other sound effects and others have no sound at all. I am really hoping the yahama chip fixes the issues because I really don't want to have to start probing the board.

[Xeno_Dragon]

Has this been resolved? I have a 1 slot doing  thing