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explained :

The trouble with modern smpsus is they check various things and wont
start if they dont get the right answers back. So smpsu faults are
somtimes down to the LOP stage. It stops fires but makes trouble
shooting more complex.

They check the loading on each monitored rail is within specified
limits as they start up and if not shut straight down again. A
perfectly ordinary 100w mains lamp used to be adequate loading to load
test a TV SMPSU.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk