Asus A7V600-X

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paddee28

Hi all

Recently built a computer for a friend. Anyway, all has been fine until
I had to go sort out a problem. Looked at PC Probe and next to the
VCore +12V setting it`s flashing "+12v out of threshold". I understand
that PC Probe is not always accurate so got the reading from the Bios.

CPU Temp: 50 degrees
MoBo Temp: 37 Degrees

And the Vcore Voltage for +12v stays between 9.60 and 9.66 occassionaly
ducking down to 9.53!

+3.3v and +5v are slightly below 3.3 and 5. I can get exact figures for
other settings if necessary.

Is this a faulty power supply problem. I haven`t been told of any
problems when the computer is running.

Any help appreciated

Thanks

Paddee
 
Hi all

Recently built a computer for a friend. Anyway, all has been fine until
I had to go sort out a problem. Looked at PC Probe and next to the
VCore +12V setting it`s flashing "+12v out of threshold". I understand
that PC Probe is not always accurate so got the reading from the Bios.

CPU Temp: 50 degrees
MoBo Temp: 37 Degrees

And the Vcore Voltage for +12v stays between 9.60 and 9.66 occassionaly
ducking down to 9.53!

+3.3v and +5v are slightly below 3.3 and 5. I can get exact figures for
other settings if necessary.

Is this a faulty power supply problem. I haven`t been told of any
problems when the computer is running.

Any help appreciated

Thanks

Paddee
Click to expand...

Power supplies are generally expected to regulate to within
5% and should do better than that. The label on the side of
the supply will tell you some of its characteristics.

A low voltage can be a bit dangerous on a switch mode power
supply, like a Vcore circuit, because as the input voltage
drops, the input current rises. (Basically, it will attempt
to draw a constant amount of power, to supply the constant
load on the output.) A good switching regulator circuit
will have UVLO (under voltage lockout) and the regulator
will switch itself off if the input voltage is too low -
not too many motherboards have this feature, but it is a
good concept.

To save money, I would start with a voltmeter check of the
power supply while it is running. (I.e. You don't want to
spend the "customer's" money, unless you've verified the
problem.) If you access a spare disk drive cable, it has
+5V and +12V outputs on it, and you can ground one end of
the voltmeter to some shiny chassis metal while the other
voltmeter probe goes into the 4 pin connector holes. Independent
confirmation of the voltages is important to prove to your
friend that a power supply replacement is required. Or,
if you have another supply you know is working well, you
could swap it in temporarily and prove that the original
supply is faulty. In any case, I would not leave
this situation as it is currently, as at some point the
disk drives are going to refuse to run with that low
a voltage. And a tortured power supply won't run forever
either.

Paul
 
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