"computer" wrote in message ...
I do not understand why I could NOT get a clear reading from a regulator

but the rest of the regulators have clear voltage reading in a IWILL
motherboard.

I was sucspect the regulator was faulty and in fact it is not. the sound
is
causing the hanging of the xp system.


the clear reading is 4.09 voltage. unclear reading, the voltage readings
flow from nnn mV...etc and did not stop .

do u have any ideas ?



If you're reading straight from one of the legs of the regulator then you
will get an unstable reading- you're measuring a pulsed output from a
switching regulator. Try measuring across its filter capacitors instead. The
pulsed output from the regulator has to go through a toroidal choke and is
then filtered by capacitors to create stable DC.

Dave