MV-1FZ sound problem

Hi guys,

I'm getting a high pitch buzz from the sound in my MV-1FZ which is most annoying. I made some forum search and already checked that no long pins on the backside of the board were interfiering with each other, and I also made some cleaning on the connectors. Yet, that "piiiiiiiiiiiiiiiiiiii" noise is still there.

Any ideas of what else it might be?
Thanks,

[OCEAN]

bump

Does it always occur no matter how loud it is?

I get that noise when my 1fz is turned up loudly, and strangly if i hold down on the volume knob, i get AM radio.

are you using it in a cab or a supergun?

The noise always occurs, even when I power on the machine and the game hasn't started yet, I can hear it. But yes, it gets louder with the volume...

I'm using it in a converted cab, but I tried in it some other PCB's and there was no noise, so I'm pretty sure the problem is from the motherboard.

Any ideas?
Thanks,

[OCEAN]

bumpy before goin' 2 sleep.
Help please!

[OCEAN]