If your TV is turning on by itself, it could be due to settings that have been enabled. To turn these settings off, simply follow the steps below.
Navigate to the TV "Settings" on the top right of the home page.
Select "Network & Internet"
Navigate to "WOW" (Wake On Wireless) and "WOL" (Wake On Lan) and toggle both off.
Go back to "Settings" and select "Inputs". Navigate to "TV auto power on" and toggle it off.