I have a Samsung TV about 2-1/2 years and the main PC board needs to be replaced. Is that normal? That's all it's used for watching television. The picture started to get dark in the top right corner a few months ago and then seemed to get better until yesterday when I turned on the tv and saw a flash and there was no picture, just sound. I had an old Sharp CRT for 44 years that worked like a dream but the picture had turned cloudy so it was time for a new one.