[Resolved]  Samsung LED TV — Quality

Feberary 14, 2013, I bought a Samsung 60-inch LED TV. The use of less than five mouths there have been quality problems. My TV has sound but no picture, during which two times repair. The maintenance records as follows: The first replacement screen, the new screen has a dark line in the Middle of the screen. The second time replaccement screen too, there is sound but no picture. The same model, there were three screen quality problems, Samsung's products testing realty doing it? Stability of the product reliable ?