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Old 09-03-2008, 12:35 PM   #1 (permalink)
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Unhappy Wierd Funky Voltages On Motherboard!

hey guys, i got a prob.

heres the deal...

i got a ASUS p5n32-e sli mobo. now after i had it for bout 3 months the voltages on the motherboard started to drop a little day by bay. for instance the 3.3v on the mobo when i got it was 3.3v but has been losing volts, bout 0.02v every week. till the point it is now 3.17v. same for the +12v. rest of the voltages seem to be uneffected.

now at first i left it alone untill the pc refused to boot. and i bought another psu(600W, the previous one was 500W). then everything returned to normal. but then the same voltage drops started to occur again. so i have just bought yet another psu this time a 650W coolermaster psu. (note the past 2 previous psu's where isonic psu's). but now the voltages are sitting where they were with 600w and still dropping!!!

i have satified myself now that it is not the psu which is at fault. but i have no idea what else the problem is. i can run games etc on the pc as it is now but i fear the pc is gona die again.

i havnt overclocked my pc at all.

and one wierd thing is that i rebuilt my pc (ie took mobo out case and re-assembled everything) and the voltages where back at 3.3v etc but then started to drop again!!! WTF!!!

my pc specs are:

intel Q6600
2gb OCZ RAM
XFX 8800gts 320mb
3 assorted sata HDD's
asus p5n32-e sli mobo

pls someone help
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Old 09-03-2008, 01:37 PM   #2 (permalink)
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Default Re: Wierd Funky Voltages On Motherboard!

Check your devices. IT sounds like you have a device that is drawing more power from the PSU which is taking it from other places. I had a floppy drive that was like this. Ended up drawing so much power that it killed the PSU long before it should have.

Use a multi meter to check and make sure your devices are not drawing more than what they are speciffied to draw.
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Old 09-03-2008, 01:46 PM   #3 (permalink)

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Default Re: Wierd Funky Voltages On Motherboard!

If one of those assorted SATA drives is a Hitachi, check that first. They have had voltage problems for as long as I can remember.
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Old 09-03-2008, 02:29 PM   #4 (permalink)
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u really think it could be hdd's? these are the same hdd's i had in my last pc n they never gave trouble there... :\

jus checked the hdd's by unpluging them one by one and checking the voltages. its not the hdd's
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Old 09-03-2008, 08:37 PM   #5 (permalink)
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Default Re: Wierd Funky Voltages On Motherboard!

just wanted to provide some info....only to see if maybe it is nothing

using batteries for example...

buy some 1.5 v batteries...and they will eventually drop off to around 1.3v....

so...just maybe electronics are all the same...their is a pristine virgin state...and then the actual "in use" spec?
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Old 09-03-2008, 08:43 PM   #6 (permalink)

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Default Re: Wierd Funky Voltages On Motherboard!

You're very right atomic but normally they don't drop as much as he's saying.
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Old 09-03-2008, 09:43 PM   #7 (permalink)
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Default Re: Wierd Funky Voltages On Motherboard!

It's mostly likely the motherboard causing a problem with the 3.3v sense line.
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Old 09-04-2008, 06:15 AM   #8 (permalink)
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Default Re: Wierd Funky Voltages On Motherboard!

its also the 12v line aswell. the 12v line has also been dropping. the 12v line is now 11.58v is there anyway to fix this?
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Old 09-04-2008, 08:37 AM   #9 (permalink)
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Default Re: Wierd Funky Voltages On Motherboard!

Your voltages are within the 5% tolerance for ATX power supplies. So there isn't anything to worry about.
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Old 09-04-2008, 02:39 PM   #10 (permalink)
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Default Re: Wierd Funky Voltages On Motherboard!

but then why did my pc refuse to boot when the voltages got so low with my 500W psu?
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