Help! Fix backlight in HDTV

So my girlfriend gave me her old HDTV, it's a Samsung I believe. I have yet to pick it up. Anyways the main issue is I believe the backlighting is dying. On the left side of the Tv the backlight is gone but on the right side it is fine. How can I fix this?

LED or LCD?

Replace the ccfl. You can find instructions online and you can get the part http://www.ccflwarehouse.com/