lamp comes to mind.
i've heard regular light bulbs pop when they burn out.. i dont see why your lamp would be any different.
if the lamp is okay, then the next thing of thought would be a fuse.
if there are no fuses, then it must have been a piece on the circuit board that got too much electricity because of another piece on the circuit board (either before it or after it in the 'chain of command' that failed)
although, sometimes a single piece can pop when it fails.
mosfet chips pop sometimes (they smoke a lot too) and transistor chips also pop when they fail.. leaving an explosion view on the circuit board.