My Sony 4K Smart TV is less than 3 years old. The last two months or so it is just not the same tv it was once. Don't get me wrong it is still good color and all but the brilliant boom is gone. I have a LG tv that was the first of the LCD tv's and it has a brighter screen now than the Sony and it is at least 10 years old. I have tried all the picture settings besides vivid too. And brightness set on high level and still looks dull. Any help from the experts would be greatly appreciated.