Why is my screen shaking?

Hi Team,

I hope everyone is doing great today.

My LG 42ls3450 screen keeps shaking after 5-10 minutes of turning on. Do you have any idea how to fix it? If there is please let me know the step by step so that I can disassemble it.

I checked all the wires connected and change some of it and still the same issue. I am not sure if it is the board problem or what not. I haven't disassembled it yet cause I am not sure how the process works on television.

Thank you in advance. Please see video, I uploaded it to Google Drive cause it won't let me upload here. G Drive