You may look into replacing the inverter circuit. This actually controls the power sent to the screen. I've replaced this in laptops that the screen started going out. The screens usually last longer than the inverter circuit does. It's not too hard to switch these out.
Here's a site with a inverter for 40$, could be worth a try.
http://laptopparts.vivotechnology.ne...FQezsgodLg_lFQ