It's the internal power supply of a bar of LED garage lights. This one made a loud pop when I wired them all up.
The pad ripped off the board.
I was able to fix it by using an empty pin on the same circuit. Soldered a wire through it, then used a butt connector for the input line and the line to the other end of the LED bar.
Tried to force the magic pixies back to work during their smoke break huh?
Yeah they'll refuse to work after that until you install at least a new smoking room, sometimes more. They've been know to trash the place in such events.