I'm in the process of remounting our LCD with a movable bracket, and we found that our TV had a wire attached to the back of the TV that was attached to the wall as a restraint against the LCD bouncing off the bracket. I had to unscrew the holding screw, then lift the TV off the brackets. You need a stubby screw driver to reach the wire.
2009 GMC Sierra SLT Crew Cab 4x4 Diesel
2010 Rockwood 8280SS
Camping 2012: 40 nights