There's nothing 'on television' right now. [=there are no programs that I would like to watch now]
I recognize your face. Are you 'on television'? [=do you appear in a television program?]
What is 'on the television' [='on TV', ('chiefly Brit') 'on (the) telly'] tonight?
(..) Yes. Turn on CBS right now, Andy. Right now. You have a TV there? - Yes. Now? - Right now! Turn on the television set. We interrupt this program to bring you a special bulletin from CBS News. Give 'em two minutes. Stand right there. We're ready. This is an unlawful assembly. (..)2014 Selma
(..) what he's asking for and soon. Do you know what he has said about us in the past, Coretta? He called us "ignorant Negro preachers." Called me a modern day Uncle Tom. Said on national television that the white man pays me to keep Negroes defenseless. The white man pays me! How could you allow it? (..)2014 Selma