This TV was purchased new in December 2018 and this issue started sporadically a few weeks ago. It has been getting worse and is almost at the point where the TV is unusable. I have tried different HDMI ports, updating HDMI cables to 2.1 and just had the issue while using the built-in Netflix app, so I'm ruling out HDMI as being the culprit. I have tried a hard reset and restoring the factory setting and the issue persists and continues to get worse.
The squealing varies in volume and sometimes it is loud enough to cause a heart attack.
The local LG-certified repair person said that it sounds like a bad panel since it works at times - sometimes long enough to watch a whole tv show without i...