Replaced the lcd and now the backlight does not work

[enxm2004]

Hi

I just replaced the lcd of my macbook and now the backlight does not work. when I turn on the laptop, the lcd works but the backlight does not turn on. I tested with a couple of screens but no success.

Is the problem with the backlight LED, or fuse or logic board, is there any solution?

Model: Macbook air, 11 inches model A1370, 2011.

Any help would be highly appreciated

Thanks
Navid