High Pitched Noise from Motherboard

C

chuck4100

New Member
So, I have looked at a few forums for this topic and some threads would suggest that the mobo 'may-be' bad.
Specs:
Intel E8400 Core 2 Duo Processor 3 GHz 6 MB Cache Socket LGA775
Intel DG45ID Motherboard - Intel G45 Express, Socket 775, DDR2 800/667 MHz
Issue:
There is a high pitched noise/whining coming from the mobo, I believe to be from around the cpu or chipset area.

T/S/R attempted:
I have narrowed it down to the mobo by unplugging/removing everything I could down to just the psu main cable and the case power button. I started by removing/unplugging the fans, cd d, hdd1, hdd2, the ram then the cpu and all the misc cables (usb, audio, reset switch)

Pretty sure its not the psu because it is out of the case and ~1/2 foot away, also I tried another PSU that doesn't really fit the board at 20-pins but it turned on. At all points the noise continued, the computer boots to bios fine and the noise dampened once when i pressed down on the chipset heatsink..... I installed Win7 and the noise continues even then, however, it does change slightly and stopped 99% for about 2 secs without actually doing anything, I had also noted that the sound is intermittent, as in the signal is fully in/out. (currently connected to monitor via HDMI from onboard GFX adapter)
Greatly appreciate any thoughts and advice.
 
Sounds like capacitor whine. I got it on my GTX 570 when I first started folding with it but it went away after a while. It doesn't necessarily mean the board is bad. If it's functioning correctly, I wouldn't worry about it. If it drives you up a wall, find a replacement board.
 
Well, i mostly pinpointed the noise.

ictr0o.jpg
 
Yeah, that would produce coil whine.

Coil whine is mechanical resonance of the coil with the frequency of the signal passing through it. Physically, a coil is just loops of wire, sometimes with a core other than air. If the frequency of the signal is in resonance with the physical wires of the coil, the coil may vibrate. Oft times, the vibration is beyond human hearing (yokes in TV's can do this), other times it's in the range of human hearing.

There are many electrical parts/circuits which can cause whining noises, so don't just assume you are hearing coils. "Annoying buzzing/electrical sound" are unlikely to eminate from a coil - you have something else making noise. Whining is caused by a part (or parts) physically vibrating.

Unto itself, voltage is not going to cause a whining sound. Voltage is electrical potential (actually, EMF); current through a device is dependent on the voltage across it. With a CPU, changing the voltage probably changes the operating frequency of various components within the processor (I really don't know what is changed), however something is probably in resonance with the signal. If you can narrow down the source of the noise, you may be able to reduce or eliminate it. Try using the paper tube from a roll of paper towels to "listen" to various parts of your system to locate the source.
Click to expand...


And a possible fix:
One way to fix coil whining is to use a hot glue gun and glue the loops together. Paraffin works better, is less likely to damage any parts and is easier to remove than hot glue. Mfgr's use paraffin but most hobbyists don't have it in their toolbox. I've used hi-voltage putty - a bit of a waste to be sure - but I had it in my toolbox.
Click to expand...
 
Okay, so I put a blob or glue over the top of the coil and let it set over night.
Noise is significantly reduced, still there and annoying but bearable.

Thank you all for your inputs!
 
I would squirt some high temp silicon in under it. You can get the right stuff from a hardware store. We call it sikaflex here.

Nonconductive, heat tolerant. Works good.
 
you can also replace your motherboard there are good selection youc an choose from...

from my own personal experience I am using Hi-Fi A55S3 ver. 6.1 biostar which is quite relevant and my amp. sound is working well with it! less distortion for sound.

others are using asrock/msi...
 
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