wrote in message
...
On Thu, 28 Oct 2010 09:41:01 -0500, "Dave" wrote:

Appears (to my eye) to have a faulty voltage regulator on the motherboard,
but where? 19.5 VDC input from the AC adapter, but only 1VDC (slightly
less
actually) available at the Power On switch (which I would expect to have
at
least 5 VDC). Anybody have any idea how power is handled for these
critters? Model 305CRV. Can get SN if necessary. I somehow expected to
find something like a LM317, or at least a couple of 7805/7905
combinations.
Shows what I know about laptops. Any help is appreciated...

Thanks,

Dave


I would expect some type ofswitch mode power supply - they're
available as a single chip with minimal external components. Much
more efficent than the 'room warmers' like the LM317/78xx devices.

Check for questionable electrolytic capacitors - a dead one can kill
the switch mode power supply.

SMPS don't like caps with high ESR either - probably easier to replace
than to test.

John

Hey, THANKS John. I will definetly check this out. Much appreciated.

Dave