Fortron ATX 300GTF fails due to sustained excessive +5v load

[larrymoencurly]

Re: Fortron ATX 300GTF fails due to sustained excessive +5v load

Wow, I never would have expected a big Fortron transformer to go bad. Is there any way you can hook it to a coil ringer to see if it has a shorted winding?

The only time I had transformer trouble was with a Delta that had probably been dropped and broke a few solder joints.

[tiresias]

Re: Fortron ATX 300GTF fails due to sustained excessive +5v load

Wow, I never would have expected a big Fortron transformer to go bad. Is there any way you can hook it to a coil ringer to see if it has a shorted winding?

Hi Larry (& others)

I'm afraid I don't have immediate access to one, but I agree, it would be interesting, and perhaps useful for others with similar PSUs, to find out what exactly went wrong with this transformer. Marked "SPI", by the way - Sparkle Power, Inc?

My ohmmeter shows nothing unusual, although I do suspect it's 'missing' some short (or intermittent/positional short) that a coil ringer would allow one to detect.

...

PS. The repaired PSU is still working well - I tested it without incident under a 5v constant "full load" yesterday, 28A, according to the Fluke. Sure made a lot of hydrogen!