The set is only 6 months old. All was fine this morning but now when turned on there are 2 areas of black. One is to the right corner of the screen and it fairly large, the other is left of center to the bottom and about 1/4 the size of the other. Looks almost like the back of the screen is ripped away. Hard to describe. Any ideas on what may have caused this? Will warrenty repair it?