No power on, no trickle voltage on logic board, blown Mosfet
We have a suspected power surge on a late model iMac.
Logic board ID 820-3588 , power supply tested OK and swapped in known working power supply.
1. No Trickle diag LED at all
2. No power on , chime etc
Blown Q7610 dual N channel mosfet which is a FDMS3602s FET
No other liquid or burn marks on board itself.
Mosfet appears to have shorted or had voltage applied beyond its limits.
Fet failed dramatically after a few power on attempts and was not blown initially on inspection.
Have replaced part with exact match , no power on yet fet is intact thus far.
Anyone else seen anything like this?
Questa è una buona domanda?