There are some copper bands the run from the main board to the screen that have small black blocks soldered in the middle. Heat from the tv can cause the blocks to have bad connections. As of the last time I checked there is no quick or guaranteed fix. I however took two of mine apart and bought a pack of the smallest black paper clamps and clamped the blocks to the strips and then removed the crome wire finger tabs from the clamps because they will be in the way and mine work fine. There's a couple you tube videos that show what the problem is and how to locate the problem. This fix is my idea sorry no video of the fix that I know of.