Backlight faults can arise due to   various reasons, including:

 

 1.Backlight LEDs:

           The LEDs providing the illumination might degrade or fail over time, resulting in uneven lighting or complete darkness in some areas.

 2.Backlight Inverter or Driver Issues:

             Problems with the inverter or driver circuits responsible for powering the backlight LEDs could cause irregularities in the backlight performance.

 3.Connection Problems:

             Faulty connections between the backlighting system and the TV's mainboard might lead to issues with the proper functioning of the backlight.