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[RDC]

It's not a FET, it's a Regulator. If you didn't pull the exact same part from the same place off of another board then you've possibly caused more damage, they all may look the same, but they're not. Telling you exactly what's wrong with it's not possible either, since people aren't in the habit of shorting out parts in the 360, it's not a common problem that's happened enough to say what's bad and I (or anyone else for that matter) are not about to possibly fry a working 360 to duplicate it just to see what goes bad, might not be the same part that dies anyway, electronics can be like that.

It needs to be troubleshot, and that means testing a bunch of parts, unless you want to call up the engineers at M$ and tell them what you did and can can get a flow chart or schematic so ya know what is supposed to be working under what circumstances. So again, either send it to someone that knows how to use a multi-meter correctly or trash can it. Just taking a wild guess, since that's all anyone can do without testing it themselves, is that if you managed to short the small center lead of the Regulator to the 5v input lead of the Regulator, then you shot 5v onto a line that should only have 1.8v max on it, that most likely fried the Southbridge right there, and that means trash can.

[RDC]

So you think the Southbridge is good and the same part is bad because it gets hot like the last one? Not very much to support that theory there. It's most likely getting hot, like the last one, because something else is bad.  Check the old Regulator and see if it's good, that still hasn't been determined yet, and all you need is something that outputs 5v or more, a 9v battery would work just fine, to see if that old Regulator still works and outputs the 1.8v that it is supposed to. If you couldn't get the Regulator off there you're not going to be changing a Southbridge chip any time soon, at all.

[flippy10]

Listen Blah,
The Southbridge chip connects all of the components together, including power controls, idlers, and basic functions. If perchance, the shorted regulator destroyed the Southbridge, who can say it didn't take out any of the other components on the board? You had somebody replace it for you, and the same problem resulted. This obviously means that there is another problem on your board. That board is toast.

[RDC]

It's a 1.8v 1A Low-Dropout Fixed Regulator in a DPAK case.

[RDC]

The original part number is NCP1117DT18G (it's in the NCP1117 family) you can handle the cross referencing grunt work from there.

[RDC]

That question makes you sound about as sharp as a bag of wet mice, how is anyone supposed to know if the Reg. you found is gonna work when you haven't even stated what Reg. you found?!? While it's true pretty much any 1.8v fixed Reg. will work, not all are going to solder right into place, they don't all have the same lead configurations.

Besides U5B2 the only other 1.8v Regulator on the 360 board is U2T1, it has the same part number on it and if you'd have bothered to look over it for a few minutes you'd have found it yourself. You really either need to leave that thing alone, send it off to be looked at or bin it, it's pretty obvious ya have no idea what you're getting into and, as has already been stated, the thing is most likely NOT the problem and isn't going to do a thing after being replaced, since it was already and that got ya nowhere.