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Shuttle MN31n motherboard emitting a high pitch frequency.

Cheetah8799

Diamond Member
Hello all. I've got a strange problem here that I'd like to solve. I have a Shuttle MN31N motherboard that I purchased as a refurb from Newegg a while back. I didn't test it quickly enough, and am not unable to return it to Newegg, and Shuttle won't take it either according to their RMA policy. I'll skip the rest of the sob story and get straight to the problem.

Pic of the motherboard to help you visualize what I am talking about.

The motherboard is emitting a very high pitch frequency. I know for certain it is NOT anything else in the system. I have pulled all drives, fans, etc and it still makes the noise. I've also used different CPUs and Ram, and the components in there now have worked fine in other systems as well. I don't hear the sound all the time, it comes and goes, and nothing seems to prompt it. Sometimes it also seems to stutter extremely fast. I've narrowed it down to somewhere on the end closest to the CPU and ram slots, and very near to the CPU socket. I've never had this problem before, and I've worked on a LOT of computers. I'm thinking it might be a bad capacitor that is somehow emitting the sound, but I can't tell which one. It could also be the "ite" chip next to the CPU socket, or maybe something under the chip in the socket.

Does anyone have any suggestions as to what could be wrong? At this point I'm just sticking my head in there trying to find out what's making the sound... Any advice would help.

thanks.
-Josh

EDIT: I think I may have found some helpful info on the nForcersHQ.com forum thread here. I haven't determined exactly which component is causing the sound, but it is probably fixable with a little soldering.
 
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