The power supplies usually have a pretty tight fit. Is the cord worn down, or is the housing for the plug cracked and allowing some loose movement from the plug?
You could order a new power cord from Samsungparts.com, but I don't know based on this information if that would solve the problem.
My little Sammy has a problem. When i plug the power cord into the back of the tv it's real loose and most of the time it falls out.
The LN19B650T6D came with the 52B630 I bought from Crutchfield months back. Still under warranty.
Any suggestions on what to do with this problem