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Locating high pitch noise from PC power supply.

My computer power supply has been acting strange lately. Whenever I shut off the PC, the power supply creates a very high pitch, continuous noise like several Cicadas on steroids. I have tinnitus so I didn't notice the problem until recently. I'd determined that it came from the power supply because when I pull the power supply from the motherboard or shutdown the PC the sound gets louder. I noticed that the power supply fan was removed when the bearing began to produce a loud noise a month ago - that could be the problem.What part of the power supply is capable of producing a very high pitch continuous noise like a Cicada?

Thanks

Reply to
Sam Nickaby
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There's often a tiny stand-by power supply that's always on. It's the tiny transformer near the power plug. Putting a lot of spray varnish on it may help.

BTW you'd better replace the fan pronto. PS's will run without it but the extra heat will eventually shorten its life.

Reply to
Ancient_Hacker

At about the time of 2/14/2006 6:26 AM, Sam Nickaby stated the following:

First thing that you need to do is put a fan in it. Those things run hot.

What can produce a squeal? In TVs, there is such a thing called a singing flyback. I've also seen diodes and transistors do this before catastrophic failure. Best bet is to replace the supply unless you want to attempt to fix it. If you do work on it, there is one thing that I want to make very, very, very clear...

### COMPUTER POWER SUPPLIES HAVE HIGH VOLTAGES ### ### EXERCISE EXTREME CAUTION WHEN WORKING ON ONE ###

I don't want to read in the paper that you were electrocuted by one of these things. They usually quad the line voltage so they can get a tighter regulation. This means that inside the case on the primary side of the switcher, you have 480VDC at currents that can exceed 1A.

--
Daniel Rudy

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Reply to
Daniel Rudy

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