Hello,
My Cisco SG300 28port POE switch crapped out on me. Can't connect to it unless I go through the console and when I do it keeps giving POE errors. This happened after a power outage so I opened it up to have a look inside. The first picture is the inside of the switch. Power supply voltages are good. The problem is in the board on top this is the POE board shown in pictures 2 and 3.
In the 2nd picture I have removed Q16 mosfet (N2NF10) it was shorted, fuse F45 was open. Also diodes D63 & D64 shorted but tested fine when removed.
On the back side Q46 mosfet (also N2NF10) shorted along with diode pack D58 (BOV23S) has an open diode inside and capacitor c165 open. D55 and D54 have also been removed to be tested and they are fine.
Now even though I removed the shorted mosfets the traces are still shorted on the board. So I removed U6 POE Chip (PD69012) and the short on the board is gone.
So at this time I need to find a source for the PD69012 POE chip. I ordered a couple from Ali Express but who knows if they are real.
In case they turn out to be fakes does anyone know where I can get this chip?
Also the fuse F45 has only an "L" marking. Anyone know what the value might be? I'm guessing maybe 500ma but if it's littlefuse brand it could be 1.75A?
Thanks
Pete