Display backlight doesn’t work

Hi community,

So unfortunately the other day I spilled some wine on my MacBook Air.

I took it apart, cleaned the logic board, put it back together and it works except for the display backlight as I can see the lock in screen when I shine some light from the back through the Apple.

A friend at work gave me his two also broken Macbook airs as he doesn’t want to deal with Apple products at all anymore.

So I was able to swap logic boards around but ultimately in all MacBooks the backlight never seemed to work.

What could I do now ?

Help is greatly appreciated.

Nic