q_q_anonymous@yahoo.co.uk wrote:
> kony wrote:
> > On Fri, 29 Sep 2006 13:51:52 +1000, "Rod Speed"
> > <rod.speed.aaa@gmail.com> wrote:
> >
> >
> > >> Even when unplugged, you could still have
> > >> the charge in the capacitors. (second risk)
> > >
> > >Nope, they have bleed resistors across them.
> > >
> >
> >
> > ... and the PSU contiues to runs the 5VSB and control
> > circuit after unplugged, which would drain off most of the
> > power even if the resistors weren't there.
>

I'll check how long my ATX(so, with 5VSB) takes to discharge. with a
multimeter on 5VSB.

According to this guy quoted below, 1000 seconds (16.6 minutes). Though
it seems he didn't take into account the 5VSB+control circuit that you
mention.
He also suggested that some may not have the restistors. And perhaps
some may have different rated resistors


http://forums.silentpcreview.com/vie...&view=previous
larrymoencurly
"There are bleeder resistors across the big high voltage filter
capacitors. If the bleeders are 200K ohms and the filters are 1000 uF,
then they should be almost completely discharged in 200K * 1000 uF * 5
= 1000 seconds. "



http://forums.silentpcreview.com/viewtopic.php?t=6123
larrymoencurly
"
A 6800 uF capacitor (about ten times the size of those in ATX PSUs)that
I charged to 18V several months ago is currently at 13.4V, so I
wouldn't rely upon leaving the PSU unplugged for several weeks to drain
off the voltage.

Some of my PSUs make a noise just before the LED on the mobo goes dim,
and it's never taken more than twenty seconds. If for some reason this
doesn't work, then PSUs usually have or are supposed to have an approx.
200K ohm resistor across each big high voltage capacitors, and if this
capacitor is 1,000 uF, then the resistor should discharge it in 200K
ohms X 1,000uF X 5 = 1,000 seconds, or 16.7 minutes. Unless a resistor
or something else around one of those capacitors looks burnt or
ruptured, then the resistors have probably done their job. But you have
to know what those resistors look like.
"

thanks