iSight camera not connected, how can I check the cable connection?

A few months ago, I took my MacBook Pro 15" Unibody Late 2011 (MBP) to the Genius Bar because of a bad Logic Board, it stayed with them about 3 days for them to fix it. When I got it back, the iSight Camera gave me an error "There is no Camera connected". I google searched for fixes and found a few that I have tried unsuccessfully, it had me open the Terminal and type in a command that force reset the camera APIs or something.

What I would like to do is find out where the camera is connected on the logic board to fix it myself, otherwise I'm gonna have to take it to the GB again and be without the MBP for a couple of days.

Please help.