I have the same issue. For some reason the backlight LED of my display doesn't work anymore. I was away to get coffee and i come back and my display was black. When i shine with a flashlight at the screen, i can see everything. So it's clear to me that de backlight not working. I have called Apple Support and did some things, like resetting the NVRAM. Can i fix this problem, by replacing the whole screen? Or is this a fuse problem? Or something else with the Logic Board?