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From: davy on 6 May 2008 16:39

Theres two power supplies in a computer PSU.... the 5V that is always on
as long as there is power there, this is the 5V standby supply that
switches the main power unit when commanded... here should be some
useful readings-:

'Power supply rail Voltages'
(http://www.answers.com/topic/power-supply-rail) and 'About Power Supply
Units' (http://murfsgarage.cybertechhelp.com/Power.htm) and heres a
bonus to top it off 'Power Supply Calculator'
(http://www.journeysystems.com/power_supply_calculator.php), hope
they're useful.

davy


From: Rod Speed on 7 May 2008 04:45
davy <davy.390rpf(a)no.email.invalid> wrote:

> Theres two power supplies in a computer PSU.... the 5V that is
> always on as long as there is power there, this is the 5V standby
> supply that switches the main power unit when commanded...

Thats comprehensively mangling what actually happens.

> here should be some useful readings-:
>
> 'Power supply rail Voltages'
> (http://www.answers.com/topic/power-supply-rail) and 'About Power
> Supply Units' (http://murfsgarage.cybertechhelp.com/Power.htm) and
> heres a bonus to top it off 'Power Supply Calculator'
> (http://www.journeysystems.com/power_supply_calculator.php), hope
> they're useful.


From: kony on 7 May 2008 11:28
On Mon, 5 May 2008 07:42:01 -0700 (PDT),
"jameshanley39(a)yahoo.co.uk" <jameshanley39(a)yahoo.co.uk>
wrote:

>I was experimenting with the wires - power_on(green) ,
>power_good(grey), and 5VSB(purple)
>
>I had read on a pcguide article, something along the lines of, the
>PSU sends 5V down power_good , and 5VSB. And when the power button is
>pushed, the motherboard then turns the power supply on (presumably
>connecting the green and black)
>
>
>Oddly though, I have noticed that for the few computers I have, if I
>cut the power_good wire on my atx psu , it still works fine. The
>motherboard is not checking the power_good.
>
>any thoughts why it isn`t checking it?
>
>TIA


Design guides, specs, etc... all very good ideas, but
there's no international task force compelling others to
follow them in spirit, if at all.

For example, consider the generic 500W PSU capable of only
250W.

I suspect in some cases the motherboard designer takes the
quick route assuming the PSU must be held reponsible for
turning off if power isn't "good", that the motherboard
itself needs no further reasons not to post and run - which
would increase customer returns if it could otherwise work.

Now the curious question, why you're cutting the power-good
wires on your power supplies?
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