Unfortunately, without physically seeing the set, I would not be able to diagnose it. That said, I would suggest contacting the Samsung service center in your region for further assistance, and to have a tech sent to diagnose the issue.
I recently got a hold of a Samsung LN-T4661FX/XAA. As TV screens are made by lines, the top say, 20 Percent of the screen flickers black in the upper right hand corner. The lines are not blacked out or damaged in anyway. In fact, when I first got it, it worked fine. So the TV is capable of working properly and the screen does not seem to be compromised.
When I apply light pressure to the frame nearest to the flickering, or any physical stimulation for that matter, the lines react. In fact, I can apply pressure to the screen in such a manner that the lines cease completely and the TV functions correctly. As I must conclude, it is a physical connection problem. How should I go about repairing this connection without causing permanent damage to the screen??
If I am wrong, what other diagnosis are suggested?
Thanks for the support!!