But it's always an LCD issue. Either the model is a value model where the LCD is less than perfect or it's the old LCD BRUISE (see google.)
At 3 days, squawk and get it replaced. If the replacement is same, it's the model and should be returned and start shopping again.
I just bought my Sony bravia xbr-55 x850d. But after I had it for 3 days I noticed some grey color when we watch movie or change chanel, is it a defect item or is it repairable (diy), or should I exchange it. Thank you so much for you answer in advance.