Il Tue, 30 Mar 2010 21:14:04 +1100, Phil Allison ha scritto:

"supervinx"


I've little experience in switching PSUs ... I've one of them (coming
from an Amiga 2000) which shuts off at the first load.
With no load at all, it delivered 5.9V out of 5 nominal.

** Many PC type switching PSUs need a load to be applied on ALL the
outputs on order to work properly.

Why not apply load resistances ( not incandescent lamps either) to each
DC rail and see if it holds up then ??

Thing is, when you load just the 5 volt rail, the other DC rails go UP
in voltage - and that may trigger the out of range voltage detector
circuit and stop the whole damn show.



.... Phil

The PSU shuts off under normal operations while connected to his MB. I
connected it to an external HD (load on both +5 and +12): I see the
voltage raising and the voltage detector shutting the PSU down.
I have no oscilloscope handy ... with a digital multimeter I can see the
+5 rising about 4.8, the +12 about 9 and then stop.

The main capacitors are 200V rated, but I see 215 across them