On Wed, 21 Jan 2004 22:50:29 -0500, w_tom wrote:


I'd like to see you on the service bench repairing computers. You
wouldn't last a day. There is nothing "logical" about computers. You
spout theory, if theory doesn't work you blame the technicians, and
just can't face up to the fact that you're flogging the same thing and
haven't had actual experience in the matter.


Once, at a party, I met a well-known DJ. We got along famously until
he insisted there was no stereo before the Beatles. "Fantasia" was
not true stereo (maybe not), Audio Fidelity didn't have Stereo
records, they were Binaural (not true, Cook records were Binauaral);
The RCA and Sidney Frey "Wall of Sound" recordings were just fake
ambience; "The Robe" and other big-budget films of the 50's were never
stereo (which of course is how they are now presented on DVD.) Tthe
Pathe double-disc recordings of the 20's were just "loud. Of course
the first "Stereo" recordings of the Beatles have been released in
oriignal Mono.. The point is, he had made up his mind and explained
away anything that didn't agree with his mindset.

. Steve .

Even the separate "always on" power supply (keyboard power)
cannot be damaged by too much load. Standard design in every
power supply chip. Your experience, without supporting
fundamental knowledge, only demonstrates how junk science is
promoted. Power supply, properly designed, is not damaged by
too much load or by a short circuit.

If the keyboard is killing power supplies, then a human is
buying defective power supplies. Much too common with humans
who buy on price rather than value.

If power supply is damaged by keyboard, then power supply is
defective. If all power supplies are damaged same way / same
reason, then a human is the reason for continuous power supply
failure.

Overseas manufacturers have discovered a lucrative market.
Computer assemblers who buy only on price. Then when power
supply fails, they blame surges, peripherals, or anything else
they can 'speculate' without required fundamental knowledge
and real world data. It's called junk science.

Most likely reason for repeated power supply failures on the
line called +5VSB is a human. Notice this post comes with so
much real world knowledge that even the signal name for that
purple wire is provided. An obnoxious way of saying one
should first learn basic facts before making 'expert'
conclusions. If power supplies are repeatedly damage by that
keyboard (and it am not even convinced those power supplies
were damaged - another topic), then a human is reason for
failure. Load cannot damage the +5VSB on a properly designed
power supply - no matter how many "friggin"s are posted.

"Steve(JazzHunter)" wrote:

On Wed, 21 Jan 2004 19:29:47 -0500, w_tom wrote:

Assumed: a power supply can be damaged by too much load.
Not possible. In fact, Intel spec says how big a wire must be
to short together all power supply outputs - without damage.
That's right. All DC outputs from a power supply can be
shorted together and no damage may occur. So how does the
trivial load of that keyboard draw too much power?

Then a circuit limiting fuse on motherboard that provides
power to keyboard. Just another reason why keyboard could not
damage power supply.

The keyboard power is separate from main power, it is always on, and I
don't want to hear any friggin' more about how keyboard power "can't"
damage a power supply, when it most definitely DOES, and repeatably,
and demonstratably. The keyboard can draw 500ma, ATX spec calls for
720ma on 5v standby, almost all AT and cheap ATX supplies are only
rated at 200 or 300 ma, that can fail, often within a minute,
sometimes after a week or more, but it DOES, and only because keyboard
power is enabled. Drop by sometime, and I'll blow some power supplies
for you.... g