Problem with Xbox Controller

[Kyle]

So I've got a problem with the "Fatty" kind of xbox controller model


When it's plugged in, it only executes UP the whole time, like on Auto/Rapid-Fire. I tried different Controller Ports on my Xbox, but it didn't change it. I already opened it up to see whether there is dirt in the analog stick or the dpad, but everything looks fine.
Any idea how to fix this?

[CRTGAMER]

I'm leaning towards the stuck DPad up, but maybe the stick could be bad? Take a close look at the left Analog stick potentiometer and see if it moves when the stick is bumped. Scruntinize the pot itself for movment, maybe the little pin sheared?

[GameMasterGuy]

If it's just off from neutral position and not entirely broken, try holding it up while booting up the console, then returning it to the center.

[Kyle]

I tried adjusting potentiometer, but it goes either only up or down.
I also tried holding it in the up position on start up, none of it worked.