K7S5A Troubleshooting Tips?

My K7S5A stopped working suddenly. I had not opened the case, so it
was not damaged by static.

The symptoms are that the Power light comes on, but the processor and
memory are cold as ice - apparently no power getting to them at all.

I brought it down to the minimum configuration with video card, floppy
and re-seated the memory and power cables. The processor is a Duron
750 and the system has been working fine for 10 months now. I tried 2
other known good PSUs and no difference.

What would cause loss of onboard power? Any suggestions appreciated.

"Al" <> wrote in message news:...

" What would cause loss of onboard power? Any suggestions appreciated. "


Are all the capacitors intact?

On Sun, 24 Oct 2004 15:35:08 GMT, (Al) wrote:

>My K7S5A stopped working suddenly. I had not opened the case, so it
>was not damaged by static.
>
>The symptoms are that the Power light comes on, but the processor and
>memory are cold as ice - apparently no power getting to them at all.
>
>I brought it down to the minimum configuration with video card, floppy
>and re-seated the memory and power cables. The processor is a Duron
>750 and the system has been working fine for 10 months now. I tried 2
>other known good PSUs and no difference.
>
>What would cause loss of onboard power? Any suggestions appreciated.


I would look closely at all the big Capacitors around the power plug and
voltage regulators. I've used a bunch of K7S5A boards. A few I bought
in late 2002 died from bad (swollen) caps.

"Al" <> wrote in message news:...
> My K7S5A stopped working suddenly. I had not opened the case, so it
> was not damaged by static.
>
> The symptoms are that the Power light comes on, but the processor and
> memory are cold as ice - apparently no power getting to them at all.
>
> I brought it down to the minimum configuration with video card, floppy
> and re-seated the memory and power cables. The processor is a Duron
> 750 and the system has been working fine for 10 months now. I tried 2
> other known good PSUs and no difference.
>
> What would cause loss of onboard power? Any suggestions appreciated.

If the other suggestions don't help, reset the BIOS by using the jumper and/or
removing the MB battery.
I can basically duplicate your symptoms by setting the ram timing too
aggressively.
If you are using unmatched ram sticks, try using just the fastest one.

On Sun, 24 Oct 2004 21:53:57 GMT, Big_Jerk <>
wrote:
>
>I would look closely at all the big Capacitors around the power plug and
>voltage regulators. I've used a bunch of K7S5A boards. A few I bought
>in late 2002 died from bad (swollen) caps.


Thanks to everyone for the info. I have seen quite a few posts of
people having the same problem - this should help. BTW, one post
mentioned a dead battery. I wonder what the symptoms of that would be.

"Al" <> wrote in message news:...
> On Sun, 24 Oct 2004 21:53:57 GMT, Big_Jerk <>
> wrote:
> >
> >I would look closely at all the big Capacitors around the power plug and
> >voltage regulators. I've used a bunch of K7S5A boards. A few I bought
> >in late 2002 died from bad (swollen) caps.
>
>
> Thanks to everyone for the info. I have seen quite a few posts of
> people having the same problem - this should help. BTW, one post
> mentioned a dead battery. I wonder what the symptoms of that would be.

The mb battery is very cheap $2-4.
Usually the symptoms are a loss of the BIOS settings when the unit is off and
unplugged.
Try using the BIOS jumper to reset it and make sure the unit is unplugged when
you do it.
This helps bleed off the voltage and helps ensure the BIOS gets reset to
defaults.
I would definately use just one stick of memory at a time to see if it will
boot.
If it isn't the memory or capacitors, it may well be a motherboard problem.