What kind of part is this?

Working on a sony PSOne video display with no documentation.

First problem was a tiny fuse of some sort; it was open. Shorted it with a wire. From the way the power supply was behaving (pulsing on and off), I decided that some component had shorted, ant that's what took the fuse out.

By some judicious cutting of traces, I was able to isolate one component that was shorted (it connecetd between the voltage bus and ground), and by cutting one of the traces to it, the whole display fired up and seemed to work just fine.

Now I need to know what that part is so I can replace it.

It looks like a black rectangular tantalum surface-mount cap, except the the letters printed on it, and the component designator on the board by it, aren't right.

There's one obvious tantalum cap on the board. Its designator is "CP1"; this thing is "DP1", and on it are some odd symbols followed by "133", and below that the letters "ZHU".

If it were a capacitor, then one of the two would be "CP2", but this is "DP1".

So I'm thinking "diode", but I have no idea what specs it should have.

Note again that the display is working fine without it, but still, I'd like to get it fixed properly.

Any idea what it is?

thanks, Isaac