One fine day, the IP cameras connected to the switch Mikrotik RB260GSP (CSS106-1G-4P-1S) became unavailable. Visual inspection showed that the switch is not working, and its power supply is in protection mode (green LED blinks). The problem was in the diode D13, through which was to take place POE IN power from the first switch port. The diode has been broken (PN-junction voltage - 0V). When unsoldering it, the switch started working.
The question is - what is this diode labeled LT7A22? What can replace it?
When you do not use the function of powering the switch from PoE via port 1 (and not use the power supply) you can just omit that component…
Yes of course! I understand it. I would like to recover the device all the way!
Yesterday I found that this is a Schottky diode B340LB. The LT7A22 marking is the batch code. I am looking for a more powerful diode since there is space for it on the board!
You can use any Schottky diode you like (that fits on the board).