I have a 55 inch projection samsung hcn5529W is the model number. My problem is the that it sags from corner to corner on all 4 sides i thought it may be the lens focus but i dont know how to adjust it can u help me out.

This tv problems it is call a convergence picture problems,it is dead.Tv have any colors lines R,G,B mis alignments,have colors shadows pictures or 3D pictures look alike?Yes,than the tv board that call a convergence board it is dead to causes this problems.The tv convergence board must have be repair like replacing 2 STK convergence ICS and some or all of it resistors too.Fix the tv convergence board to solved the tv convergence picture problems.The tvs shops will cost u like $300-350 for parts and labors.