Re: AC power bump, dead computer


"w_tom" <w_tom1@xxxxxxx> wrote in message
news:1187287908.808201.316380@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Aug 15, 4:16 pm, "bushwhacker" <po...@xxxxxxxxxx> wrote:
The fans running only indicate your 12volt rail is functioning.
More than likely the 5 volt or 3 volt rails are dead

Or fan is powered from -12 volts. This done for some design
reasons.

Enough voltage can exist to spin a fan and still power supply
voltages are 100% defective. That spinning fan does not even imply a
good 12 volts - for at least two reasons posted here.

If low AC mains voltage causes any electronics damage, then the
electronics were defective when purchased. Industry standards were
quite blunt even 30 years ago. The charts even stated "No Damage
Region" in an area between 108 and 0 volts. Low voltage does not harm
electronics. That is but another function of the power supply.

However when so many computer assemblers do not even have electrical
knowledge, then dumping power supplies into a market of technical
naive Americans is so profitable. Ask why so many Silicon Valley
engineers are now ICs - Indians and Chinese. We have too many
computer experts who know computers - and yet don't even know about
functions that were industry standard 30 years ago.

Buy a power supply that sells at only 60% standard price. It will
be missing essential functions so that the cheaper power supply also
has a higher profit margin. If electronics are harmed by low voltage,
then the human should look at himself as the reason for that failure.

Posted is how that power supply becomes a suspect or is exonerate in
only two minutes AND how Fitz can obtain more useful replies from
those who actually have technical knowledge. That means numbers from
a 3.5 digit multimeter.

Even those two reasons why a fan says nothing useful about the 12
volts should be standard knowledge among computer hardware literates.
Another concept quickly learned from experience when using the meter.


No *** dipstick. I was just pointing out the fact that a spinning fan
doesn't make it a good power supply. And Indians and Chinese only even got
into the game because they work cheap and make much more money for
Americans, not because they are any smarter by a long shot.


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