I had the same issue with my Samsung 55" NU7100 (Model No. UN55NU7100FXZA) from Best Buy. After only 2 years in my case, it developed a slightly brighter white spot near the bottom-center of the screen, followed soon thereafter by a vertical black stripe like the one in the original poster's photo. I am very dissatisfied with Samsung, and will look to other manufacturers for a replacement TV.
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