TV Repair Questions? Ask a TV Technician for Answers ASAP
Hey there! Welcome to Just Answer, an independent, paid-support site. Sorry to hear you're having problems, my name is Wes and I'm going to do everything I can to help you find the information you need. Screen burn can occur with a brand new OLED TV if single images are displayed on the panel for extended periods. The reason this happens is that OLED elements age as they're used and the brighter the image they are displaying, the faster those individual elements or pixels age. The reason you get screen burn (or image retention) is when some pixels wear faster than the pixels around them because they've been displaying a brighter image than the pixels around them. For example, channel/station or news logos can cause this.
It depends on how bad the image retention is. Your TV should have a pixel refresher function, you'll have to look through the menu screens as its location varies by model. You can try running that. However, if the image retention is significant, there's nothing you can do to make it go away. It may fade somewhat over time as the other pixels in the panel age, but turning it off for several days probably won't have any effect.
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Try the sequence here under Clear Panel Noise: https://www.lg.com/us/support/help-library/tv-image-burn-or-image-retention-CT10000020-20150765477853
Click on "Ways LG helps reduce burn in" then look for Clear Panel Noise.