In article <(E-Mail Removed)>, "dev648237923"
<(E-Mail Removed)> wrote:
> Yes -- board is on its anti-static bag on table.
> I will try a different psu tonight and so confirm it is the baord.
> ***One question -- is it OK to run the board with no cpu/vid/etc -- just the
> board itself -- to confirm the power supply will run (that is to see if the
> power supply fans will turn)
> Thanks
The switch on the back of the PSU is not the whole story. You
also need to connect the power switch to the PANEL header. It
takes a momentary contact of the two power switch pins on the
PANEL header, to make a motherboard start. Otherwise it
will just sit there with the green LED glowing.
When you switch on the PSU at the back, that causes +5VSB to
flow to the motherboard. The green LED on the motherboard lights
up. When you close the two contacts on the PANEL header (by pressing
the power button on the front of your computer case), a chip on the
motherboard latches the switch closure, and sends the PS_ON# signal
to the power supply. Then, the power supply sends back the
+3.3, +5, +12V main rails to the motherboard, and the computer
will start to POST.
And, yes, I've run a bare board with a power supply. To test
that the Asus Vocal POST works without a CPU. In this case, it
would be safest with a supply that does not have a minimum
load spec printed on the label. I see this supply does have
a minimum load requirement, in which case I'd plug the processor
into the board before testing. The processor will draw some 12V2.
Without the processor present, 12V2 would be zero load. The output
voltage might not be in spec, with zero load present, but the
extent to which the power supply does not meet its output voltage,
is not stated. If this was my hardware, I'd try it with the
processor in place.
http://www.antec.com/specs/SP450_spe.html
And for powering, both the main power connector, and the ATX
12V 2x2 square connector must be connected. The square
connector is what powers Vcore for the processor.
Paul
>
> "Chris Hill" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> > On Thu, 17 Aug 2006 10:30:41 -0400, "dev648237923"
> > <(E-Mail Removed)> wrote:
> >
> >>My ASUS p5w dh delux wont start...
> >>
> >>The green sb_pwr LED lights up but none of the fans run and also the power
> >>supply fan does not run.
> >>
> >>I checked the power supply on another motherboard and it worked OK. The
> >>power supply is an Antec SP-450 smart power (some Antec power supplies
> >>have
> >>problems with some ASUS boards I heard??? -- does anyone know of issue
> >>with
> >>SP-450 from Sonata II case and ASUS P5W DH Delux board?).
> >>
> >>It's odd the power supply fan dooes not even run -- like the board is
> >>shorting it out?. I tried it with just mobo -- no
> >>cpu/memory/vidcard/hdd/etc.
> >>I tried with and without the 4pin atx12v.
> >>
> >>I used all caution for static sensitivity.
> >>
> >>Thank you for any ideas!
> >>
> >>p.s. I'll try another manufacturers power supply as soon as I can get
> >>one --
> >>will post if it turns out to be Antec incompatibility for others to know.
> >>
> >>
> >
> > Have you tried pulling the board and placing it on a non-conductive
> > surface, sounds like it could be shorting out, or you couldn've just
> > gotten a bad board.
> >>
> >
Similar Threads
