Disable Energy Saving Mode on LG Smart TV

Hello,

I wanted to know how to turn-off this ECO settings. Its on on my TV for some reason. But when i try to change that a message appears : The screen will turn of after 3 seconds" or something like this.
I´ ve read other threads on this topic, and you recommand Head to Picture > Energy Saving.
When I do that, there are all the options, yet when i press aroow up or down, the screen shuts down again with the msg mentioned above.
Its not a new TV, I have it rather long time.

Thanks for any reply, Paul.