I have a Samsung 22 inch TV that I've been using as a monitor for my computer for the past year. Just now (like literally a few minutes ago) I noticed a thin blue line running down the screen on the right side. Recently I've noticed that my speakers have been picking up signal from somewhere and that that signal is amplified when bring my phone or tablet closer to the headphone jack. Do you think that what ever is causing interference with my speakers is what has caused my TV to act up? A few days ago I got a cable (coaxial) modem installed and it sits underneath my TV not sure if that's relevant. Currently I unplug my TV from its power and will see if the problem has resolved. The model I believe is a UN22F500 or something similar.