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Unfortunately, many lower-end 4K TVs, and even some mid-range ones, use WebOS or similar systems that may default to 1080p for certain apps due to processing limitations. High-end TVs generally handle native 4K better because they have more powerful processors and better upscaling algorithms. You might want to check if there’s a firmware update for your TV or see if the YouTube app settings allow you to manually select 4K playback. Another option is to use an external streaming device like a Roku or Fire Stick, which often provides better app performance and resolution handling. If you’re working with visuals to test or tweak your display quality, converting images to compatible formats can help. Here’s a tool that might come in handy: https://www.movavi.com/image-converter/pgm-converter.html

Hello, my first post here. Same problem here, after last update my tv(42LB730) is stuck. I call (Romanian)LG service centre and the problem seems to be an wrong Holand servere update. My tv now is in the service, the digital video board must be changed (Eprom issue).