I did find a solution but you must be comfortable with rooting your tv. I had to root and add a startup script that would disable the internal screensaver when your app is running.
https://discord.gg/TD4UhC6a
the above link shows how to root your tv.
i tried the edit function while using Youtube...............doesn't work.............when i click on ''screen off'' button - it says it won't work for certain apps...........i'm using the most budget tv model so maybe that's the reason ?