Chosen Solution
Hi. all i had to detach my MacBook pro 15 " 2018 (A1990) screen because it was broken. The keyboard backlight dies not. work anymore. Did I mess something. up or the backlight cable is connected. to the screen?
If your screen is no longer attached, the reason your keyboard backlight does not work anymore is likely because your computer can no longer communicate with the ambient light sensor. The ambient light sensor is part of the system which sets the auto brightness for both your display and the keyboard backlight. Without this data the device just removes this functionality. You may still be able to adjust the backlight settings manually using the Touch Bar. But I have see occasions where it won’t work at all in this case.
I am talking about MacBook Pro 15” 2018 A1990 And I am talking about the keyboard light. It sure has, I have been using it for years, there must be an understanding somewhere :)
