Dead PSU.. help needed

Havoc08 · 5th February 2009, 09:33 PM

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

wakibaki · 5th February 2009, 10:15 PM

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

Havoc08 · 6th February 2009, 10:07 AM

I will take some photos and check for bulging caps when I get home.

Also I will measure on all rails to verify voltage.

Havoc08 · 8th February 2009, 08:16 PM

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.

Havoc08 · 22nd February 2009, 03:26 PM

Fixed it myself, but thank you for your interest

5th February 2009, 09:33 PM	#1
Havoc08 diyAudio Member Join Date: Nov 2008	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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5th February 2009, 10:15 PM	#2
wakibaki Banned Join Date: Jan 2008 Blog Entries: 2	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

6th February 2009, 10:07 AM	#3
Havoc08 diyAudio Member Join Date: Nov 2008	I will take some photos and check for bulging caps when I get home. Also I will measure on all rails to verify voltage.

8th February 2009, 08:16 PM	#4
Havoc08 diyAudio Member Join Date: Nov 2008	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.

22nd February 2009, 03:26 PM	#5
Havoc08 diyAudio Member Join Date: Nov 2008	Fixed it myself, but thank you for your interest

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