gamecube controller freaks out when it rumbles

[like45ninjas]

I went ahead and cleaned one of my gamecube controllers, by taking a couple q-tips with 99% isopropyl alcohol on them and scrubbing the entire PCB. I also desoldered the rumble pack. But now, whenever the thing receives a rumble command, it sends crazy signals to everything else on the controller. For example, when I tested my controller in Ikaruga, any time there is a rumble, it could activate anything from the c-stick to r/l buttons to Z or x/y/a/b.

Does anybody know what could have caused this? I don't really mind if I can't salvage my controller, I can just buy a new one, but I'm really curious as to what may have happened. As far as I can see, nothing has happened to the controller besides me cleaning it.

Thanks

[matrigs]

I also desoldered the rumble pack.
Thanks

Are you 100% sure that when desoldering, you haven't accidently connected two points?

EDIT: If you have a multimeter, check for continuity between the points were you desoldered the rumble with ground etc.

[like45ninjas]

I'll check that.
What do you mean by check with ground? Sorry I'm really new to this, just using my dad's equipment.

[matrigs]

Take a multimeter, set in on resistance measurement, put one probe on the point you desoldered and use the second probe to touch around the board. See if you have continuity (resistance drops to zero). This might indicate that you accidently soldered some points together that you shouldn't.

A good magnifying glass should do the trick as well