Hey there Gaultlindseye,
I'm sorry for the late response, but I wanted to hop in here to see how I could help. I understand wanting to make sure your TV is secure while you're not home and am happy to look into this.
It appears that you're not able to lock your TV so that no one can access it or turn it on by using the Google Home app. That may be a feature that you may want to look into through Phillips though.
Please let me know if you have any further questions or concerns.