I've recentley replaced my inverter board because the backlight was flickering however this did not solve the problem. I am now in the process of replacing the backlight itself as I suspect it is faulty. In the process I seem to have scratched off bits of the back off the screen (not the plastic casing etc of the LCD). There is a very fragile coat over the white part at the back of the screen - I think it spreads the light from the backlight. What exactly is this layer for - will there now be patches in the screen when I get it all working again?