Macbook Air 2011, trackpad clicks but pointer doesn't move.

Hi, I have got a mid 2011 Macbook Air. It's trackpad is not responding, besides clicking any object on the screen it doesn't do anything else.
The trackpad can't move at all for some reason. And I know for a fact that it's not the trackpad itself as I had it replaced, and it does the same with the new one.
Upon opening the macbook air up, i noticed there was a little corrosion build up on the trackpad ribbon slot on the logic board. Now, the computer still works fine (i'm typing this on it). I have hooked up an external mouse and that works. And so does every single other thing, except the trackpad touch...
Is my logicboard done? or could it be that the ribbon has gone bad due to corrosion?
Thanks

ALSO, I just checked and my right speaker doesn't work either. Its around the same spot where the ribbon connects to the logic board and it also had some corrosion on it. I have cleaned it all with 99% isopropyl alcohol but no avail.

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Macbook Air 2011, trackpad clicks but pointer doesn't move.

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