Hi jumay,
Thank you for your interest in TweakTV. The User Menu settings for each TV posted on this site are provided by our Professional Calibrators and obtained before performing a full home-calibration of the display with state-of-the art-equipment. We are providing User Menu settings, which do not represent a Professional Calibration involving the calibration of the entire video system (grayscale, color management, etc.)
While we don’t have your exact model in our data base, we do have the User Menu settings for a model that is similar to yours. Try them at the link below, and let us know if you see any improvement.
http://www.tweaktv.com/tweak-my-tv/calibration-guide/samsung-ln-40b650.html