A:Answer Hi, If you see lines on all channels, try changing to a different input (or to an app), to see if the lines appear on those as well. If the lines appear on all inputs, run a picture test. Go to the Picture menu (Settings > Picture). Choose the Picture Test option. Please check this troubleshooting steps https://www.lg.com/us/support/help-library#:~:text=If%20you%20see%20lines%20on,Choose%20the%20Picture%20Test%20option.. ^Vanessa
