I just had the same thing pop up on my screen yesterday. Same exact model. My line was on the right side of the screen. It started from the bottom and went about half way up the screen. It was about 5 or 6 inches from the right side of the screen. I used instructions from another thread on here to try and get into the service menu and that made the line go away. The instructions said to hold down the input and volume down buttons on the tv while plugging in the power cord. Keep holding the buttons down and the tv should power on and after about 5 seconds a small box with the letter K will appear on the left side of the screen. The instructions said to then press and hold the volume down and channel down buttons to enter the service menu but that part didn't work for me. So I turned the tv off and back on again and the line was gone. This is without actually going into the service menu. You can try this and hopefully it will work for you. Maybe I was just lucky.