Flo NEd it could possibly be the LCD board. it is also possible that this is caused by a bad power board (not supplying the proper voltages), or bad LED strips. You could try to measure to the LED string while your TV tries to start up. Since there are four strings in this panel, you would need to do that four times. It might help if you can post pictures of all of your boards and the wiring in between those boards. That way we can see what you see. [guide|21499|Adding images to an existing question - iFixit Repair Guide|new_window=true]