| Posted By
Chicken
on 2007-03-29
11:31:11
 |  plus/4 PSU makes loud sizzling noise...
After 5mins my PSU starts to make a sizzling noise. It's loud enough to make me worry. Do I have to expect a failure soon? Are TED/CPU at risk if the PSU fails while the machine is on? I'd rather not risk anything. Unfortunately, I don't have another PSU here 
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Posted By
Chronos
on 2007-03-29
13:39:57
 | Re: plus/4 PSU makes loud sizzling noise...
i a have a similar one.. and an another one which is silent yet.. in the weekend i will ask my father this noise is good or bad or kill the cpu or what. he is electrotechnician or something like that i don't know the exact english naming..
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Posted By
TLC
on 2007-03-29
15:57:22
| Re: plus/4 PSU makes loud sizzling noise...
Well, you shouldn't worry (as far as I'm concerned). The noise must come from the transformator itself, from the coils (to be precise). When the trafo is manufactured, they impregnate the coils with lacquer, so that they become solid and no windings can move. With time (as the trafo heats up / cools down repeatedly), some of the lacquer will break and parts of the coil will get partially loose. Those parts of the windings will move periodically, as soon as applying alternating electromagnetic field... ie. plugging the thing into the mains. Similarly, sometimes the metal plates, of which the transformator core is made, get sometimes loose and make similar noise. Either case, it shouldn't be risky to operate the computer from such PSU.
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Posted By
Chicken
on 2007-03-29
16:20:35
| Re: plus/4 PSU makes loud sizzling noise...
Thanks for the detailed answer! After that "blown up" filter in that 1551, I started to be careful. Anyway, I'll blame you if anything goes wrong 
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