Reset the System Management Controller (SMC) The SMC manages power management, including backlight behavior. A persistent black screen with power on indicates a failed LED panel or a damaged display cable.
Fix MacBook Pro Backlight Software Glitches
Keyboard shortcut combinations accidentally triggered by the user. Ambient light sensor being covered by dust or a screen protector.
If a case or sticker is blocking it, the computer might think you are in a dark room and lower the backlight to zero. Sometimes, the operating system or an app is overriding the display settings.
Resolve Software Glitches Affecting Your MacBook Pro Backlight
If the sensor is obstructed or the calibration is off, the backlight may turn off or dim significantly without warning. These actions resolve the majority of software-related display issues in minutes.
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