Re: HP Z600 PSU Delta DPS-725AB Dead

hello and welcome, thanks for the advices

i have a problem with this machine after less than 3 minutes it forcedly shutdown and there is no response until unplugging the power cord and the main caps discharged, then plug it again and powering on the machine and it continuing to do the same things as a closed loop.

i have checked the value of the fusible resistor and its not shorted.
i have changed the TNY279 with the TNY280 they are the same except the TNY280 holds much power referring to its datasheet....