Quote Originally Posted by jcool View Post
Naw, sorry. But I know a burnt phase when I see one (seen enough )

I too am not sure what causes them to die. My last one died in operation (without a reboot or anything) while I was away... it was still running but only drawing ~100W of power from the UPS and not reacting, when I restarted it never came back.

I didnt say you didnt know what a PWM was...
But more like which one was burnt...

Maybe all of them a dieing.... with the same one buring out.