You said you got this e6 for a b6 price? This right here is a red flag. The fact the serial numbers dont match up either is a big indicator. Return this set asap! Sounds like you got a store return from someone who didnt haven their original box and swaped out just the tv. That big dark spot is bad at that 5% ire. My dark spot only shows on 4% or less. Every e6 i have exchanged (3) had a darkening effect somewhere in the screen unfortunately.Ok, I just setup my brand new E6. I had the B6 and exchanged it for the E6 because I was able to get one for the same price as the B6. I ran some banding test patterns and I attached an image of my TV's output at the 5% pattern. my B6 looked 10 times better than this. No banding at all. The E6 not only has banding but it looks like a dirty panel with blobs of dark areas. Does the TV need to be broken in? The serial begins with 606 (June 2016) but the box ID starts with a 603. I heard builds 603 and 604 have major banding issues but what number do I go by to know if mine is one of these builds? The serial or the box ID. Strange I get a June 16 serial and it's the end of December. Thing has been sitting in a warehouse for 6 months? I've read something about an "auto comp cycle" helps reduce banding? What is that? Also read that some have had the banding go away after extensive use?