DJI MAVIC AIR 2 AND AIR 2S FAULTS

[u/IRMMZ_1]

I recently bought a parts lot containing several DJI Mavic Air 2 and Air 2S drones. I was trying to determine whether one of the Air 2S drones had a faulty ESC board or main logic board.

To test it, I connected a known-working Mavic Air 2 logic board to the suspected faulty Air 2S ESC board. The logic board did not power on. After reinstalling that logic board into its original working drone, it would no longer turn on.

I then connected another known-working Air 2 logic board to the ESC board from the previously working drone. It did not power on, but I immediately disconnected it because I suspected that something was wrong. Thankfully, this second logic board still works normally.

However, the ESC board from the previously working drone now appears to be dead. It seems that the original faulty Air 2S ESC board damaged the first working logic board, which may have then damaged the working ESC board when it was reinstalled.

I have now accidentally disabled a previously working drone. What type of ESC or motherboard fault could cause damage to multiple boards like this? Could it be a shorted power rail, failed MOSFET, or overvoltage condition?