Adjust Brightness Manually Use the keyboard F1 and F2 keys to increase the brightness to maximum. Ambient light sensor being covered by dust or a screen protector.
Effective Fixes for a MacBook Pro Backlight Not Working
Apple Support or an authorized service provider can perform a diagnostic test to determine if the repair is cost-effective. Hardware failure of the LED strip or the display assembly itself.
If the backlight works correctly in this environment, a login item or driver is likely the culprit. Immediate Troubleshooting Steps Before assuming the worst, follow these steps to reset and recalibrate your system.
Effective Fixes for a MacBook Pro Backlight Not Working
If a case or sticker is blocking it, the computer might think you are in a dark room and lower the backlight to zero. You can then isolate the specific software causing the conflict.
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