The model is LE40D550K1W
it is about 5 years old and the problem manfested itself yesterday afternoon. I had been trying to connect my laptop to the tv to play some wedding photos to our guests. I could not get the pc to load the pictures and the issue started minutes after I disconnected it.
There is a skybox connected via HDMI and a DVD player via a cable.
If I disconnect box external appliances the lines are still apparent on the screen.
I will try unplugging and resetting when I get home.
Is the t-con board something I can get at externally? You say it is located at the rear of the LCD panel, where is that likely to be?
Do I need to replace this if disconnecting from the mains does not work. Where do I get a replacement?