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look for monitor repair techs in or around RALEIGH north carolina
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ChadTower:

Well, let's try saying this.

Monitors don't hum. 

Where is the hum coming from?  99% likelihood it is the speakers, thus being almost as likely some type of feedback.  Check the power source for AC ripple, swap in a different JAMMA board and see if the hum goes away.  Hum goes away, your problem is the MVS board.  Hum stays, it's in the wiring or power supply.

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