I think there are two problems. Tiredness and boredom. TV's sweet spot is when you are mildly bored and pretty tired. It tires you even more but alleviates boredom a bit.
I had after-school routine. When I was comming back from school I was bored and tired but too bored and not tired enough to go to sleep immediately. So I watched TV for an hour or two becomming slightly less bored and completely tired. After that I slept for few hours and after that wake up and be semi-funtional human again, able to do homework or enjoy myself for a bit.
The problem was I got addicted to TV and I watched it even if I wasn't that tired and theoretically had energy to entertain myself with something that had better joy/effort ratio than TV. Instead I always defaulted to TV which costed me too much energy for enjoyment provided.
Eventually I had to ask my mom to put a parental lock on TV and even then after school I was lying in front of turned on TV that showed no channel (due to parental lock) pushing buttons at random trying to unlock it. I even managed to unlock it once (3 digit code) but couldn't repeat it.
Eventually my dumb brain learned that lying in front of a TV no longer gives me any joy (because I can't turn the channels on) and I shook the addiction.