SIRKGM14vg,
What happens when you have a source on with a dark picture? Don't those highlighted areas disappear and become black again?
Some lack of screen uniformity is normal - especially with no signal, and shouldn't affect the picture when you have an active source or signal going to it.
Keep me posted.
--HDTech
I just purchased a brand new UN55B7100, Samsung's new LED display. I noticed when I have a source off, and the display remains on 8 areas on the diaplay are slightly brighter than others. The four corners and, if you will the four corners of a square in the "horizontal" center of the TV.
X----X----X----X
| |
| |
X----X----X----X
Refer to the above for a picture description of what I'm speaking about.
Is this normal? For a TV that is supposed to be "black" it's a little disconcerting; however I can make them darker by changing the Auto Dark setting in the menu.
If you need pictures, I can snap them and post them on my site and link to the forum in here...

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic