Re: varying voltage on 3.3v on Asus motherboard

Thanks Paul

As i have experienced, it was not low constatly, but it is varying
constatly. Below, i have given the ranges. But sometimes it goes
beyound 2.97 to 2.92-93 or more.

Paul wrote:
>
> If you enter the BIOS, when you start the computer, then
> go to the hardware monitor page, does the 3.3V readout
> give the low voltage readings there as well ? If the reading
> is perfectly stable in the BIOS, it might means PCProbe
> is not working well.


I've checked in BIOS, it is still varying following is what i have got:

BIOS Hardware Monitor PC Probe
Vcore 1.312 to 1.344 1.278 -1.31
3.3v 3.024 to 3.056 2.97 to 3.056
5v 4.623-4.677 4.73 - 4.95
12v 11.77-11.904
11.648-11.776

looking at both it doesn't give much difference as i've looked hardly
for 3to 5 minutes at BIOS hardware monitor page & i've taken pc probe
figures from its recorded history page of last few days... sometimes
3.3v goes below to 2.97 & at that time pc probe gives me warning. when
it goes down it was somewhere around 2.92-95 range or below. but after
some seconds may be 10-15 seconds, it goes back to normal range 2.97 to
3.056 and stays there in pc probe.


>
> The 3.3V is used to create lower voltages for use by the
> memory DIMMs, and other voltages to run the chipset. It
> might be used by PCI cards or the video card. Many things
> are powered by 3.3V either directly or indirectly, so
> it is an important voltage.

Does it normally varies, or it is special case when it start varying
between 2.97-3.056 ranges. I've hardly found any record in history when
it is on stable 3.3v or even more than 3.056v. Does it gives any
potential threat to my system or other components?


>
> You might find someone who owns a multimeter, and get
> them to independently verify the voltages coming from
> your power supply. It could be that the power supply is
> weak, and is about to fail. Power supply failures are
> one of the most likely causes of a computer to fail.
> If you can find someone to measure the voltage, that
> will reduce the risk of buying a replacement power
> supply for no reason.

is this voltage varying is fault of power supply? or may be on
motherboard. Sometimes ago my motherboard got failed without any
unusual thing happend & i got it replaced under warranty. Along with
motherboard, my P-4 processor & Ram also got failed & i replaced both
under warranty. It got failed just as the next morning the system
couldnt start. So i'll find someone with multimeter & got power supply
checked soon.

Also, i'll reply again when i got it checked with multimeter & clamp-on
DC ammeter.

Thanks again Paul
krunal



>
> A well equipped repair shop might also have a clamp-on
> DC ammeter. I have one of those here, and it is handy
> for measuring the current that the computer uses. It
> can help a technician to see, if the motherboard is
> shorting out or not.
>
> Another test you can do, is to remove the motherboard
> from the computer case, and sit the motherboard and
> the power supply on a table. That is called a
> "cardboard test", because you place a piece of cardboard
> underneath the motherboard while it is operating. The
> purpose of a cardboard test, is to make sure that nothing
> inside the computer case, is shorting to the motherboard.
> If PCProbe reads a steady 3.3V when the computer is
> booted while sitting on the tabletop, then something
> must be shorting to the bottom of the motherboard when it
> is in the computer case.
>
> As you have said you are not an experienced user, I am
> not recommending the "cardboard test" for you, and perhaps
> you can get a friend to help you troubleshoot the source of
> your problem. Buying a replacement power supply is certainly
> the easiest thing to try, but is not guaranteed to solve
> the problem. At least try alternate methods of measuring
> the voltage first, to make sure this is not a measurement
> problem.
>
> Paul

.

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