Screen Backlight not working

Hello <3

I just changed the keyboard and trackpad, an when I turned on the MAC again, the backlight is not working :( Screen is working, I am able to log in, etc. It is the A1502 2013/2015

I reset the connections almost 4 or 5 times and it’s not working. Checked the PCB for faults and everything looks clean and smooth, no water damage or anything.

I was wondering if it could be the screen cable, but when I opened the cover at the screen I found 2 different cables:

Do you know if the backlight power is inside the big cable (2) or is it on that other tiny connector (1) ?

I am about to buy another LCD cable, but wanted to ask first.

Thank you <3