Shabbs

Hi I've searched all forums and found many faults swith LCD screen but am yet to find a thread with a solution. My Spider V Mk11 120 starts fine, LCD show's Line 6 and then presets fine but within seconds it starts to darken until you can't see it at all. It can be controlled by remote but wold rather find a solution to the screen. Any ideas would be good, if screen needs replaced then a source would be good. Appreciated.