Originally Posted by Dean Hunter
Small Semi circle lighter place on side of television. About the size of a half of a Tennis ball. More noticeable on solid colors. The attached pic is zoomed in.
Sorry that you have this imperfection, I'm sure it's disappointing (been there, done that, with a previous Samsung 2014 model I purchased, so I feel your pain). If none of the multitude of picture setting options have any significant impact on that semicircular artifact, and you notice it on other HDMI inputs too, with other equipment attached (DVD player, game console), then I'd say short of being a problem with the HDMI cable (which is highly doubtful), then it's likely a manufacturing defect in one of the layers of the panel itself, and the only way to resolve it (hopefully!) is to exchange it for another one while you're still within your return window. As others have pointed out, ALL LCD TVs HAVE SHORTCOMINGS, even the $10,000+ ones, part of it being limitations with this type of technology (exacerbated as you move up in screen size) as well as the roll-of-the-dice aspect when it comes to the manufacturing/quality control process itself, not to mention how the panel was handled, packaged, stored, transported, and installed post-assembly. My 65JS8500 isn't perfect by any means -- just the other day I noticed for the first time in 3 weeks that there is a thin horizontal band within the top 6" of the screen that is only apparent on lighter backgrounds, but it also seems to come and go depending on channel and source quality, and sometimes it's more apparent on off-white gray or yellow hue backgrounds rather than pure white ones. The fact that sometimes I see it and sometimes I don't (and that others in my family don't) is enough to drive me insane, but I'm not willing to take a chance on another set due to this minor imperfection that's playing hide-and-seek with my brain (perhaps the next set will have stuck pixels or extreme edge bleeding or awful clouding or banding issues or not power on at all -- who knows), and because overall this TV still blows me away with its upscaling capability and 4K nano clarity. It's all a matter of what you're willing to live with and to not go looking for imperfections (which I know you haven't done), but to let them find you instead (which hopefully none will).
So, if that semicircular artifact is something that others notice too without you pointing it out to them first (you said your attached pic was zoomed in), and you can't make it less noticeable regardless of input or settings or cabling, and your eyes will always be drawn to it even years down the line, I'd suggest you roll the dice and exchange it while you still have the time to do so, even though it's an inconvenience (especially if wall mounted). Best of luck with whatever you decide to do.