On Labor Day I hooked up the power backwards on my flight controller and it immediately destroyed all 4 ESCs (Electronic Speed Controllers) as soon as I connected the battery!
It was a really embarrassingly stupid move on my part and an expensive lesson. The Flight Controller itself was fine as it’s protected against reverse polarity, but the ESCs were not. Got new ones in the mail by Thurs and then spent two nights taking it all apart and rebuilding almost everything.
Here are some pictures
Flight Controller Board
The yellow wires are soldered to the Flight Controller (FC). On the opposite side are the 4 wires coming from the receiver, which gets signals from the pilot moving the sticks. The FC then sends signals on the yellow wires to the motors in order to cause the mini-quad to perform the maneuver that corresponds to the pilot's stick movements.
A video after getting everything working and back up in the air…