How to test MacBook Air M4 for dead pixels
Use the dead pixel test tool above. The MacBook Air M4 uses a 2560×1664 (13") or 2880×1864 (15") IPS Liquid Retina panel at 224 ppi. Individual pixels are very small — test at maximum brightness in a darkened room.
Disable Night Shift and True Tone during testing: System Settings > Displays > Night Shift (Off). The notch area at the top of the display is not testable — this is expected.
What a dead pixel looks like on MacBook Air M4
Dead pixels on the MacBook Air Liquid Retina display are tiny permanently dark dots. At 224 ppi, a single pixel is ~0.11mm. The IPS panel's wide viewing angle means the defect is equally visible from all viewing positions, unlike older TN panels.
Appledead pixel warranty — what's covered
Apple's standard warranty applies. The MacBook Air M4's IPS LCD panel (not OLED) means dead pixels have a different failure mechanism to OLED. For the full Apple warranty breakdown, see the dead pixel warranty policies by brand.
How to fix a dead pixel on MacBook Air M4
Try the stuck pixel fix tool first for stuck (colour) pixels. For confirmed dead (dark) pixels, Apple repair is the only solution.