Sun Mar 05, 2023 5:13 am
I don't happen to have this model, so will go with how I usually repair this type of problem. Check all the passive components next to the jack, make sure none have shorted. (Shorted capacitors will act more like a wire, resistors often go open circuit.) The large black component behind the port is an isolation transformer (pc13n1zh), it's possible it's been damaged by the surge (it's not meant to handle large amounts of current from that kind of surge). Then there's the POE circuitry next to that, there's a fuse, rectifier, not sure what the other device is I can't find a part number on the photos i found online, but probably part of the poe for extracting the power and letting the signal to continue though to the isolation transformer, that could be damaged (but less likely as it's more of a power circuit). I'm just going by a picture I found online of the board layout, and the manufacturer spec sheets of the parts. I would start with all the passive components and do process of elimination, and trace out the circuit, if they all test fine I would probably lean more towards the isolation transformer has faulted as it's not supposed to carry a lot of current. Now if it's really bad it may have also damaged the two chips next the isolation transformer (D1, D2), which lead to the SOC, which if it made it past that and damaged the SOC then there's nothing you can do to fix it.