“There is a line on my tv screen. I have unplugged everything checked for updates. It’s still there. What should I do?”
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Check to see if the line appears in the settings menu for the LG 55” Class UA77 Series LED AI 4K UHD Smart webOS TV (2025), Model # 55UA7700PUB. If the line appears in the settings menu, the issue is likely a loose internal cable, a faulty circuit board, or physical damage to the panel. If the lines disappear in the menu, the issue is likely a bad cable or an external device. By unplugging the TV, you performed a Power Reset that effectively drains residual power, which clears temporary glitches. If you have other HDMI cables you can try, switch the cables out to see if that resolves the issue, or test your external devices (cable box, gaming console, streaming stick) on a different TV if possible, to ensure they aren't sending a corrupted signal...^Ivan.
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