Mac Screen Test Guide: How to Detect Dead Pixels, Burn-In & Backlight Bleed

The 5 Visual Screen Defects Every Mac Owner Should Check

1. Dead Pixels: Black dots on pure white screens.
2. Stuck Subpixels: Persistent red, green, or blue dots on pure black screens.
3. Dirty Screen Effect (DSE): Uneven cloudy patches visible against a 50% neutral gray canvas.
4. Mini-LED Blooming: White halos around text against dark backgrounds.
5. Backlight Bleed: Yellowish light leaking from corners.

Run our free Mac Screen Diagnostic Test in fullscreen mode to test each diagnostic canvas with arrow keys or swipe gestures.