[plug] OT: hardware troubleshooting (Andrew Cooks)

[Paul Del]

Hey Andrew

Just two throw my two cents worth in

I have used and use a lot of Gigabyte main boards and once the AC power is
plugged in you can switch them on straight away
so nothing needs time to charge or settle there before you switch the
system on.

Very hard to diagnose that sort of thing unless you have a same or similar
main board to test with
I have a few Gigabyte AMD main boards and PSU's laying around if you want
to test

Chat soon

On Sun, Jun 14, 2015 at 8:00 PM, <plug-request at plug.org.au> wrote:

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>    1. Re: OT: hardware troubleshooting (Andrew Cooks)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Sun, 14 Jun 2015 09:25:55 +0800
> From: Andrew Cooks <acooks at gmail.com>
> To: "plug at plug.org.au" <plug at plug.org.au>
> Subject: Re: [plug] OT: hardware troubleshooting
> Message-ID:
>         <CAJtEV7bBp4M98Zns8_ThH751KDV+VxJzN=q=-=ew=
> eZMCjQX_A at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> On Sat, Jun 13, 2015 at 5:22 PM, Andrew Cooks <acooks at gmail.com> wrote:
>
> > Hi Pluggers
> >
> > I've got a problem with a box not powering up and I hope someone can help
> > me figure it out.
> >
>
> Thanks to Kevin, Linda and Garry.
>
> I have discovered the magic startup conditions for this box:
> Step 1. Set the motherboard to remain powered off after a power failure.
> This is critical. If the board starts immediately, reset the firmware
> configuration.
> Step 2. Restore power to PSU, then wait 5 seconds. Note PSU fan starts in
> low speed mode and motherboard LEDs turn on.
> Step 3. Press and hold power button, closing the switch for 1 second.
>
> My major mistake was that I failed to test things properly after changing
> the firmware settings to power up the system automatically when power is
> restored (like after a power failure).
>
> The behaviour described above suggests to me that the board overloads the
> PSU if it starts immediately and that the few seconds between PSU power on
> and MB power on is enough to allow things to settle. Perhaps one of the EEs
> on the list can tell me whether it's capacitors charging or little MCUs
> involved with the power regulation on the MB or in the PSU that needs time
> to settle?
>
> Two more curious things:
> 1. It doesn't make any difference whether there are lots of devices
> connected, or whether the MB only has a CPU plugged in (no RAM, GFX, fans,
> or spinning rust connected).
> 2. Why would the MB power switch need to be closed for a few hundred
> milliseconds? (A quick press and release results in it turning off again).
>
> Cheers!
>
> a.
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