Dell Inspiron 15 7537 Black Screen when dim

Hi everyone,

Hoping someone can help me here. I have a Dell Inspiron 15 7537 with a weird hardware fault. The hinge on this laptop had split the video cable which has been replaced, at the same time I also replaced the LED display, the screen now works fine with one issue in that the screen will go completely black/dim/no backlight if the brightness is set to anything less than 100%. This happens in the BIOS, Diagnostic screen, and OS. My question is, does anyone know why this would be happening? 

Thanks in advance!