Chosen Solution
Please help me to identify this.. Connected to usb charging circuit, Becomes too hot when connected with usb but fire hd 10 does not charge. Is this a diode.. Has marking L2
faisol kabir … looks like a schottky rectifier diode. check the specs here and see if this matched your application: https://www.mouser.com/Semiconductors/Di… typically, the diode will not be the issue in the charging circuit but the ic itself. this can fail and depending on where the diode is in circuit, it will overheat while preventing the backflow of current. you can test the diode as normal out of circuit to see if it is only allowing voltage drop in one direction. if its allowing drop in both directions, replace it…if not check on replacing the ic.
I had this issue as well. Diode had failed short. I removed it and now can charge fine. Was either a very poor design to “protect” against reverse polarity (still “kills” the tablet), or it was a zener/tvs diode and it “saved” the tablet from a bad charger putting out a voltage a good ways higher than 5v. I have a MMBZ5V6ALT1G that I have laying around that I’ll try to cobble in there (SOT-23, should be able to get at least one of the internal diodes soldered down). The 6V2 part would probably be better to use since the 5V6 can start breaking down as low as 5.3v. Maybe this is what the original part was and this is why it fails? I could just leave it off, but I feel like I’d be one step away from a bad charger taking the tablet out for good.
