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Old 5th February 2009, 09:33 PM   #1
Havoc08 is offline Havoc08  Denmark
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Default Dead PSU.. help needed

I have a non-standard PC PSU in my HTPC which now refuses to boot the pc. It delivers enough power to spin some of the fans and light the LEDs on the motherboard, but thats it.

It makes a faint, high-pitched whining noise when turned on.


Any ideas of what to check/measure and what to change?


Its odd-factor so a new one costs $$$$

Thank you
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Old 5th February 2009, 10:15 PM   #2
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Today's standard desktop PC PSU produces the following DC outputs: +5V, +3.3V, +12V1, +12V2, -12V and standby 5V.

Your first task is to check for these outputs. Checked the fuses, if any?

The chances of fixing this by remote diagnosis are small, but take a few good quality digital pictures and post them. By good quality I mean sharp, no camera shake, well lit (not flash) and detailed enough to read the markings on the components.

Manufacturers name, serial number?

w
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Old 6th February 2009, 10:07 AM   #3
Havoc08 is offline Havoc08  Denmark
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I will take some photos and check for bulging caps when I get home.

Also I will measure on all rails to verify voltage.
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Old 8th February 2009, 08:16 PM   #4
Havoc08 is offline Havoc08  Denmark
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Went to my sommerhouse instead

But I fiddled with it tonight and it makes a insanely high pitched and high SPL sound which almost gives you tinnitus.

Any ideas about which failing components can make that noise?


Also I measured the voltages and everything seems fine except a blue wire which gives -10,80. I suspect this to be the -12v rail, but is 10,80 too low?


Pictures are comming when the little sucker has de-powered its caps.
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Old 22nd February 2009, 03:26 PM   #5
Havoc08 is offline Havoc08  Denmark
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Fixed it myself, but thank you for your interest
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