I've had the same problem with mine, also no longer under warranty. After several months my laptop screen eventually could not maintain a solid picture without assistance. After about 45 seconds of feeling around the edge of the screen with my fingers, I found a spot that, when squeezed, steadied the picture.
I put a clip on that spot (for me about 4 inches down from the top left corner of the screen) and have been running fine for about 2 months since.