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PSU Noise issue.

Last response: in Components
April 15, 2010 3:15:37 PM

I seem to have the opposite problem that everyone else has with PSU squealing.

My PSU, an Antec Neo ECO 520C, squeals very faintly, but very high pitched, when there is absolutely zero load on it. As long as there is more than ~5% load on any one core (i7 860) this noise goes away completely.

Turning off C1E makes this noise go away also while the system is idle, except when I move the mouse cursor under otherwise zero load, then you can barely hear the faint but very high pitched squeal again.

Any ideas?

More about : psu noise issue

a b ) Power supply
April 15, 2010 3:25:35 PM

Clean all the dust out of the unit and if your handy you can replace the fan. There is also a way that you can oil the fan shaft but this will only buy you a little time eventually it will need to be replaced.
April 15, 2010 3:35:20 PM

Why would a fan only squeal under zero load?
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a b ) Power supply
April 16, 2010 2:53:39 AM

its not the fan! i believe that it is a squealing coil in the psu. apparently it vibrates very rapidly...
or it could be a capacitor being evil.
April 17, 2010 5:59:32 PM

What's the difference between capacitor squeal and coil squeal?
a b ) Power supply
April 17, 2010 10:55:52 PM


a b ) Power supply
April 17, 2010 10:57:55 PM

coil squeal is rarely a functional issue.
however, capacitor squeal can be the capacitor failing (CAN. NOT ALWAYS)!
a c 248 ) Power supply
April 18, 2010 2:51:20 AM

We've had a few similar threads in the past involving psu noise and mouse movement. There are several possibilites:

1. Deselect Smooth Mouse Scrolling in Internet Options.

2. Disable, turn off, or mute any unused recording inputs

Shovenose ready mentioned a deteriorating capacitor or coil in the psu. Deteriorating capacitors are the most common cause of electrical noise. The capacitors are used in noise suppression circuits. However, the actual bad capacitor may not necessarily be inside the psu. It may be on the motherboard, video card, or other component. Look for a capacitor that is bulging or oddly shaped. It also may have an ugly bownish sticky fluid that leaked out. They are easy to spot.
April 18, 2010 9:26:47 PM

The noise is definitely coming from the PSU itself. I can't see any leaks anywhere either. It's also ONLY when the PC is under very low loads, the noise completely goes away when the CPU or video card are doing anything. It's not just the fan noises masking it.
a b ) Power supply
April 18, 2010 11:12:31 PM

is the psu warranty over? if so, unplug it, take it out of the case, and open it up!
April 19, 2010 2:02:35 AM

It's not. The whole PC is practically brand new. Works perfectly. The noise is just annoying, can't sleep in the same room as the PC unless it's got something running to carry a load.
a b ) Power supply
April 19, 2010 3:29:31 AM

well, run f@h. look in my sig line for the link :)