Hi all,
Got this HP 320W pc power supply model PS-4321-2HF no power initially. After opening case and do some simple diode test, I found out the 2 pieces n chanel mosfet marked K12A50D (12A 500v)on heat sink 1 shorted and replaced with new ones.
Before power on, I removed the 6.3A 250v fuse and connect to a 60w bulb as current limiter. To force start, I use a wire to short the green and black pin on P2 connector. Upon power on ac, the bulb starts blinking and I heard some tiny clicking sound from the pcb but could not point out from exact location.
I suspect there is still some fault on board but has no idea. Appreciate if someone experience can kindly assist and guide me where to check and diagnose to revive this power supply. I do not wish this item to add to the dumpster.
Got this HP 320W pc power supply model PS-4321-2HF no power initially. After opening case and do some simple diode test, I found out the 2 pieces n chanel mosfet marked K12A50D (12A 500v)on heat sink 1 shorted and replaced with new ones.
Before power on, I removed the 6.3A 250v fuse and connect to a 60w bulb as current limiter. To force start, I use a wire to short the green and black pin on P2 connector. Upon power on ac, the bulb starts blinking and I heard some tiny clicking sound from the pcb but could not point out from exact location.
I suspect there is still some fault on board but has no idea. Appreciate if someone experience can kindly assist and guide me where to check and diagnose to revive this power supply. I do not wish this item to add to the dumpster.
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