[rescue] v250 power supplies?

Ray Arachelian ray at arachelian.com
Thu Aug 27 10:25:34 CDT 2009


I just got a V250 that was destined for scrapping, but I can't power it
on.  When I plug in power (110V) to both PS's, they briefly blink the
green LED, then both switch the maintenance amber LED.  The front
maintenance amber LED turns on as well.

The PS's are getting power as I can feel their fans running.  If I hold
the front power switch for a few seconds, I see the case fans and the
CPU fans spin for about 1-2 seconds and then they stop.  I also see the
DVD drive briefly get power, but that's it.

I've tried unplugging power from the DVD, swapping the power supplies
around, powering just from one or the other, etc.  no luck. :-)

I am however able to login and talk to the LOM, which says both power
supplies need maintenance.  The LOM has "On" for undervoltage under
showenvironments(I think).
Is the undervoltage flag for the output of the power supplies or the
input (120VAC vs 240VAC?)  I've seen similar behavior for v490's if
hooked up to 110V instead of 240V - the LOM works but the system won't
power.   From docs.sun.com, and the label on the power supplies, this
box can work with 110-240V, but the behavior is a bit strange.

So I'm wondering is there a common failure with these power supplies?  I
find it odd that both have failed, but yet, either one alone can provide
power to the LOM.

Should I just buy a replacement power supply (some of which I see are
quite expensive). 

Could it be something else that's wrong?

I certainly wouldn't mind taking a power supply apart and replacing
parts, but which parts should I look at?
(Alternatively, is there any other way to power this specific
motherboard via any alternate power supplies from other machines?  Since
this is for home use, I don't really need dual power supplies or to fill
all 8 disk slots.  Anyone have pinouts for the power plugs on the

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