I have a LG OLED that was 4.5 yrs out of warranty with a burn in issue. The retailer wouldn't touch it even within the warranty timeline. It was that long after that I googled the issue and it came up with some people who said LG was honoring all repairs on my specific model line due to a faulty processor and all I had to do was pay for the labor, which came to $70.
I got that new processor and a brand spanking new screen as well and never had an issue with burn in since. That processor handled all manner of things besides fixing burn in and the image was so much better than the original. Kind of like getting a new TV for the labor I paid for. Been loyal ever since and will only buy a LG OLED from now on.
All the best,
Nonoise