Hi there, I can certainly understand your concern with seeing this, especially on a replacement TV. You may have already tried some of these steps, but I'm providing a link to our full guide on how to troubleshoot picture issues in your TV.
Once you've tried all the steps, if you're still seeing this dimming, the TV will require service. There are a couple options here we can take based on your warranty status. If you’re in the one-year manufacturer’s warranty, please gather together the full model and serial number of your unit, and have ready your name, street address, 2 phone numbers (Best contact, alternative number), email, and place of purchase. Provide this information to an agent, in one of the following options below: 1.) Reach out to a Moderator directly, by selecting our name and the message option. When messaging please use a link to this thread in addition to the info above. 2.) Reach out to us on Facebook or Twitter. Please provide the same info as above, as well as the link to your thread. 3.) You can also contact 1-800-726-7864, if you’d like to speak with a live agent about this situation. 4.) Last, if you wish to speak with a live agent and don’t want to call in, you can reach out to our Live Chat team. If you’re out of the one-year manufacturer’s warranty: 1. You can utilize this link to locate an authorized service center in your area to obtain estimates for repairs: http://www.Samsung.com/us/support/service/location or reach out to any local repair shop. 2. The other option, would be a replacement of the unit. Samsung.com offers amazing deals on different models that may be to your liking, check out those deals here: https://www.samsung.com/us/televisions-home-theater/tvs/all-tvs/
