Originally Posted by DrMaxim
this would be a good way to see whats shorting yes.
its not an overload, trust me or the fuse would pop, thats why its there. its a short thats causing the psu to shut down into its crowbar circuit to preven hardware damage. something got to hot, solder flowed and there is a short.
if it was an overload, the fuse would pop as its drawing more amperage then it can handle or if it has a breaker it would trip. and if it has neither. then it gets too hot as its being over worked and catches fire. something is grounding out. could be as simple as a bent 5v pin to ground in the usb slot
which i see cause laptop a/c adapter to go into a crowbar shut down all the time. all it takes is some one to rip that usb cable out on an angle.
as for you having power supplies come back in the field after removing stuff, only proves either a) the device removed was shorting or had a leaking ground or b) the capacitors in said hardware removed or power supply have lost there ability to charge and discharge at there printed value. which can easily happen because non-solid state capacitors will begin to lose there value and ability to charge and discharge at this value at if they reach any temperature above 105 degrees Celsius. the don't have to be blown/leaking to be bad either.