How to Tell Dust From a Dead Pixel
Use simple cleaning and color checks to separate dust, lint, screen protector marks and true pixel defects before requesting a return.
Quick answer
Dust is usually on the glass, under a screen protector or inside a panel layer, while a dead pixel belongs to the pixel grid. Clean the surface and compare the same point on white, black and primary colors. A true pixel defect stays aligned to one physical screen position.
Last reviewed: August 2, 2026 · Testing method and editorial policy
Start with the surface
Turn the screen off and inspect it under side lighting. Surface dust may wipe away or cast a tiny shadow. Never use pressure, sharp tools or liquid directly on the panel.
Compare colors and viewing angle
A panel pixel remains fixed as content changes. Dust or a protector mark may change contrast with angle, focus or surface lighting, although dust trapped inside the panel can also stay fixed.
Use repeatable evidence
If the point is exactly one pixel wide and stays dark or colored across multiple backgrounds, record it as a suspected pixel defect. If it has soft edges or irregular shape, debris or a layer mark is more likely.
How to verify it
- Inspect the powered-off glass under angled room light.
- Clean the screen and removable protector safely.
- Check white, black, red, green and blue fullscreen backgrounds.
- Photograph the point only after it remains fixed and repeatable.