OK, I am kind of confused. So you wish to get the internet through the disconnected comcast service?
You do understand that even though it is a TV, it still needs an internet connection, which has only the wire in common with tv services. Do you have an internet router? Can you browse with any device?
If I am speaking greek right now, please box up your tv, and take it back!
I have said it once, I will say it again. IT!