Hi, yeah, that seems a little strange then, but if you had to move the motherboard around to replace that audio jack board, maybe something came loose?
As far as I can tell, there may be a separate cable from the LCD module for the webcam, but don't want to make you open up the system for nothing if I'm wrong, or if it's not the problem.
If you end up taking it apart again, it's something to look for though.