Faint LED banding pattern on SZ6xx series?

Hi, does anyone have like a faint vertical banding pattern on their LED screen? I have the SZ680 and its like an alternating banding pattern albeit very faint... it's only noticeable when I'm staring at a mostly white screen (like surfing the web) where it alternates from white to yellow white to yellow white to yellow (or light to dark, light to dark, light to dark). It's very faint and I don't know if this is just me or if it's standard with a LED screen?

 

i thought i read that someone else on here had the same problem and returned it for a new computer?

 

Let's put it this way: it's not in your mind. I noticed it definitely.
I suspect that it's in alot of the LED screens b/c I've seen it on many Sony SZ screens. I, after much hassle, exchanged it at Best Buy. BUT I will never go there again for a computer b/c of their non-existent business ethics. I have a new sealed replacement (they're suppposed to open up the replacement, but they forgot to).......I'm actually debating whether to get rid of the SZ 650 or see if I can return it without a restocking fee to Best Buy since the replacement they gave me is new and sealed. That's how little confidence I have in this LED screen.