Hi, I have recently purchased a second hand V3 hub. Previous owner claims the unit died after having connected a 10V supply instead of a 5V supply, and I intend to repair it. But it didn’t seem as obvious as I had hoped. So far I have only opened the enclosure to look at the circuit board.
This should be a simple fix with a soldering iron I imagine, but can anyone point out which are the capacitor and diodes that are likely blown? Will update the post later today with images of the circuitboard.
Update: I have reviewed the similar post for V2 hub, but the circuit is totally different on V3 and not comparable.
Good thing I got it cheap then. Hoping for some more costructive responses.
When I connect 5 VDC the voltage is drawn towards zero, so seem like one of the components are creating a short circuit. could be a diode or capacitor between + and -. Any guidance is highly appreciated.
I tried removing the regular diode and Zener diode close to the power plug, but it seems the problem lies further into the circuit. There is a short circuit somewhere. I suspect the 3V3 buck regulator, but the SMD footprint is so small i cannot be bothered replacing it.
@eds_oyo Did anyone find a solution to this? I have the exact same issue after connecting it to 12v.
Soldiered out the Schottky diode and the regular one, readings shows 0 amps; Replaced them with temp diodes - Reading shows 100 amps… Nothing works obviously…
