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 ?
Bad electrolytics? A high ESR will make the regulator unstable.
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
I have measuried across its filter capacitors instead.it still has funny reading the motherboard was replaced by a brand new sound and the hanging elminated and return to customer. It was testing and ran for 3 hour + with record and later the report was shown it to customers with cpuspy. Then I tested a dozen times. I am sure I get rid of the problem before I return to customers.
they feel great.
???
Then, as another poster suggested, it's likely the capacitors are failing. Have you tested across the capacitors with a scope?
Dave
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