I'm trying to fix a CD player (Project CD Box RS), and found a tiny little 6 pin chip where some of the plastic seemed to have melted. It is one of several small chips on a board that mainly contains a couple of voltage regulators, capacitors etc, as well as some pass through data bus (I think). I've already replaced a couple of L5970D regulators that blew (owner of the player managed to revert polarity of the power supply).
The chip in question has become unreadable, but it's identical to those on either side (see attached picture, the chip in question has been removed). As far as I can tell, they seem to read "2120". A 2 might be a Z for what I know.. Does anyone know what this chip is?