The "teley" is a guitar, Television is what we watch, non stop all hours of the day and sometimes when we aren't even home. It is as if it is an entity all on its own.
My first TV was called Louise. I like the name and it SUITED her. I've bought another TV and named him Jessy. I don't know. It's just happened. My friend uses locations from her collection of Novels...rather cute.
As a Brit, I can say that we're more likely to call it the "Telly". I've been calling it that since I was knee-high and I still call it that now. I've not heard of anyone calling it the screen though, but I've heard "The box". XD