acer aspire m3100 motherboard

[redrooster]

I'm putting this computer together from bits and pieces and alls gone well except for some voltages on the motherboard -12.00v is -4.67v and -5.00v is -7.14v ? all the capacitors look alright they aren't bulging or anything it seems strange that its only the two negative voltages. I took the power supply out and it measured ok neg 12v is -11.67v and neg-5v is -4.67v. All the positives +12v, +5v ect.. are spot on? Where should I begin to look for the problem do you think? Would it be capacitors? I used speccy and cuipd computer spec programs to get the voltages, they where both the same!

[Uranium-235]

Re: acer aspire m3100 motherboard

sometimes those voltages aren't accurate. is it giving you any troubles?

[redrooster]

Re: acer aspire m3100 motherboard

Thankyou Uranium No it doesn't appear to be causing problems,so thats good news.Bloody annoying though.

[seanc]

Re: acer aspire m3100 motherboard

How are you checking the voltages?
Most software you can run from Windows gets it wrong.

[redrooster]

Re: acer aspire m3100 motherboard

I should qualify that! Its OK when its booted up and going, its just getting it to boot up! When it is causing problems by not booting I can unplug and replug the sata cable on the motherboard and check all the connections and then most times it will boot? Thats why I thought it may be a cap making it go intermittent.

[redrooster]

Re: acer aspire m3100 motherboard

How are you checking the voltages?
Most software you can run from Windows gets it wrong.

I used speccy and cpuid. Both of them had the same wrong readings.

[seanc]

Re: acer aspire m3100 motherboard

Crack out the multimeter and measure from the back of the board.
I'd be amazed if such a new PC even use -5 or -12.

[redrooster]

Re: acer aspire m3100 motherboard

Crack out the multimeter and measure from the back of the board.
I'd be amazed if such a new PC even use -5 or -12.

where abouts on the back of the board do you mean?

[seanc]

Re: acer aspire m3100 motherboard

The ATX power connector.
http://www.smpspowersupply.com/connector_atx_pinout.GIF

If you don't have a cable in place of the blue or white on that picture, don't bother.

[redrooster]

Re: acer aspire m3100 motherboard

The ATX power connector.
http://www.smpspowersupply.com/connector_atx_pinout.GIF

If you don't have a cable in place of the blue or white on that picture, don't bother.

Oh OK I just had a look at the original power supply and it doesn't have those wires for negative voltage. So its nothing to worry about then. Ill disable them.