I have been having a problem with my QLED tv similar to these. I use a Logitech Harmony One remote. I have created an activity called "Watch Smart TV". The problem is that it will sometimes turn the tv back on after I have turned everything off. I did some research and found that the problem is in the HDMI-CEC settings. I turned this off and it seems to have fixed the problem. Time will tell. I will repost if the problem re-occurs.
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