sound problem with Naomi 2 and Naomi cab setup

[MuKuro]

Suddenly I get a strange permanent sound in background from speakers of my Naomi Universal Cabinet.

Naomi Power supply inside cab its OK, I have tested it.
Speakers are also Ok because I have replaced them and there is still the same problem.
Also all cables seam OK

Naomi Universal Cabinet have sega stereo amplifier but really I dont have idea about would be my problem.

I'm so warryed for my Naomi gameboard I have no way to test it in another cab.

If anyone have some advices I will be so grate

 

[lill-c]

Make sure the RCA plugs for the stereo sound are all the way in. Check the grounds.

 

[MuKuro]

Thanks for your reply,

And yes RCA plugs for the stereo sound are all the way in.

Anyway I have tested one CPS3 board with the same amplifier wich is inside Naomi cab and it works perfect.

My naomi 2 board is damaged But what was the problem?

 

[lill-c]

I have a 2 slot MVS board that the sound amp chip on the board just poped one day when I powered it on. I replaced the chip and now it woks fine. I hope you figure it out good luck.