Here I wanted to note down solution to blinking of Ubiquiti Power Adaptor Led. This problem can be observed after the ethernet cable is inserted to the some of Ubiquiti antenna radio equipments such as the Ubiquiti Power Beam 5AC. tried a 48V on my litebeam m5, and stopped working like this one.The reason of this is maybe you tried a 48V on the Power Beam or M5, and stopped working like this one. This overvoltage can be the reason for the damage(malfunctioning) of the protection diode as shown in the figure below.
The following shows power adaptor LED blink problem power beam 5AC.
So after this protection diode is replaced and the ethernet jack inserted the power LED should be turned on.
My other notes on Ubiquiti radio repair is Reparing Ubiquiti Antenna and Radio in which I covered the problem with Lite AP 5AC with potential problem of voltage regulator and bridge rectifier ICs.
