Thanks for the help! I discovered that the issue happens only when the screen "warms up". The first 20 minutes, image works as usual. 20 minutes later or so, the lines appear again. I've tried different power brick, different socket... Also resetting the initial settings. I really don't want to send it back... since I ordered it shortly after christmas, and it just arrived now, but I'm running out of options It happens with every resolution, but it seems to be certain patterns/colors that make it worse, as shown in the video. Some pics are displayed flawlessly, others have the white lines of hell all over them. But yeah, only after 20 or 30 minutes of use. I will contact LG now with the video.