Re: ATX Power supply soft power switch hack...Anyone done it?

The Award BIOS on one of my ATX motherboards will allow it to start
with pin 14 jumpered to ground. Check for some setting controlling
what to do after power loss. Mine has a reboot setting. Enabling it
allows switching of the mains to control cycling the motherboard
power. Disbaling means I have to soft-start the motherboard.

Note that controlling the power supply in this manner effectively
disables the +5V standby power that is normally supplied to an ATX
motherboard. This is a big difference from the AT style of course.
There is always power to an ATX motherboard if it is plugged in (and
switched on if it has a swicth, some supplies do not and are
always 'on' if they are plugged in) even if the ATX power supply is
not started and full 'on', and the reason the cord should be pulled
from the wall before opening the case and fiddling with the
motherboard.

Your success will vary depending upon what is using this standby
current. If nothing is using it, there should be no problems.


Barry

--- In CAD_CAM_EDM_DRO@y..., "bilg63475" <bill@g...> wrote:
> Thanks for the response.
>
> I had already contacted the PC supplier and he is going to check
some
> other motherboards to see if they support this featre. I bet some
of
> the main boards will work if the soft switch pins are just
jumpered,
> but this one dosent work that way. Just powering p the power spply
by
> shorting bins 14 and 15 I believe (the green and any black wire)
will
> start the power supply up, but the pc dosent boot.
>
> I had wanted to see what others had done before I tried building
> something to get it to work the way I want.
>
> Bill
>
> --- In CAD_CAM_EDM_DRO@y..., "Mr. sausage" <sirsausage@h...> wrote:
> > Isn't that an awful 'feature'? I had that problem too. I put a
PC
> in a car
> > to play MP3s (and GPS mapping and other goodies) and had to press
> the stupid
> > power on button every time I got in. Only thing you can
> universally do
> > would be to build a simple time delay one-shot circuit to pulse
the
> power-on
> > signal. It could be done with a 555 timer, but I was too lazy.
I
> just
> > pushed the button.
> >
> > Some power supplies I've seen (later models) do 'remember' their
> power on
> > state. You might go to your local computer dealer and see if
they
> have any.
> >
> >
> >
> > >From: "bilg63475" <bill@g...>
> > >Reply-To: CAD_CAM_EDM_DRO@y...
> > >To: CAD_CAM_EDM_DRO@y...
> > >Subject: [CAD_CAM_EDM_DRO] ATX Power supply soft power switch
> hack...Anyone
> > >done it?
> > >Date: Sat, 05 Jan 2002 21:59:02 -0000
> > >
> > >I am trying to use a ATX computer with amd 900 athalon chip in a
> > >machine and would like to simply power the computer up by
switching
> > >the ac line.
> > >
> > >This machine has a main power switch on the back of the power
> supply
> > >which turns off all the power but when switched on, you still
have
> to
> > >use the soft power switch ( a spst momentary push button ) to
boot
> > >the machine and to shut it down.
> > >
> > >Jumpering this switch does not make it power on when the line is
> > >switched and there are no bios settings which enable this feature
> > >either.
> > >
> > >Has anyone else dealt with this problem?
> > >
> > >Thanks
> > >
> > >Bill
> > >
> > >
> > >Addresses:
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