My Westinghouse LCD tv starts out fine, but after a while the screen starts to roll so rapidly that you can't see the picture.

Hello, with this model there are two thing you can do. One its the cheapest which could be causing the problem, this would be the LVDS cable, this cable runs from the top of the main board and in to the T-con board hidden under the main board. What tends to happen is that adhesive in the tape that holds that cable wears out with the heat and over time the connection comes loose, the way to fix this is to replace the tape with foil tape found at your local hardware store. The second thing that can cause this is the main board which you will need to purchase and can find out the price and availability by emailing [email protected]. Hope this information is useful, if you need information of how to repair the LVDS cable I have a sheet on how to do it including pictures. Please feel free to rate me if my help was useful.