“Has LG resolved the burn in problem on the 2020 CX model?”
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All OLED TVs are susceptible to burn-in due to the nature of the panel itself, so I'm not sure what exactly you mean by "resolved". There are multiple features in place to mitigate burn-in issues. Most of what you're going to see is temporary image retention before a permanent burn-in, anyways. More info from LG: https://www.lg.com/us/experience-tvs/oled-tv/reliability and from rtings: https://www.rtings.com/tv/learn/real-life-oled-burn-in-test If you watch varied content and don't leave the news on the entire day, you'll be fine.
Wrong! My 2017 OLED LG suffered burn in from watching CNN or Fox business 3-4 hours a day. The screen logos became permanent after 6 months.
The 2020 CX and GX models have anti burn-in features. Specifically, the TV will detect static parts of an image likely to cause burn-in by monitoring them for 2 minutes. If they remain unchanged for that time, the tv will reduce the brightness of specifically those static pixels by 20% over the course of 90 seconds, which reduces the chance of burn-in so far as to be infinitesimally small. In addition, the TV will run maintenance and diagnostics on its pixels when it sits on standby for long enough as well. All of this is beyond the fact that most use-cases for this TV run no risk of burn in by default. Only static pixels, like a logo for a news channel or a static HUD in a game run the risk of burn-in, and that risk only becomes measurable when the news channel or game is displayed on the TV for hours and hours daily for months. Unless you're an 8 hour a day gamer, or planning to use it as a computer monitor that you keep on 10+ hours a day, you run practically no risk of burn-in.
My 2017 OLED LG started suffering from burn-in less than a year into its life. It's now got significant burn-in across various parts of the screen. The only static images that were on the TV for any extended period of time were the included screen savers which I don't believe could be the culprit. I think I just got a bad panel, or maybe some other factor contributed to the problem such as dirty power or something. In looking at the research, it's obvious that my problem is not normal. But it's proof that burn-in can wreck an OLED panel fairly quickly through regular use, and such damage is not covered under warranty. It's just an added risk you only get with OLED. For what it's worth, being that I've never seen anyone else experience anything like the problems I've had, I'm assuming it's pretty rare and getting a new LG to replace the current one.
