LG TV screensaver keeps turning on

LG TV screensavers protect your screen by activating when a static image is detected. On most models, the screensaver can only be disabled in the service menu. You also cannot customise the screensaver, but can manually turn the screen off or enter Gallery mode to display images instead.

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https://readytodiy.com/lg-tv-screensaver-keeps-turning-on-stuck-goes-black-how-to-0051/ and

https://www.lgwebos.com/topic/2959-cant-turn-off-fireworks-screen-saver/