Why do I have line across the top of my sony television?

Question

It shows on all channels

Answer 1

It has something to do with the pixels. It'll get worse. I hope you have a warranty; if you do, they should replace your TV (that's what the company did for us). Good luck!

Answer 2

It all depends.

Is it permanent (all stations) or it shows up on some stations?

Sometimes the stations don't overscan, so you see a flickering line on the top. Nothing to worry about, it is part of the video signal.