What to look for
- Start with the device maker’s safe cleaning method. Turn the screen off first so surface specks and smears are easier to see.
- Look from slightly different angles without touching the panel. Surface dust can shift in apparent position relative to reflections; a physical pixel remains fixed in the image grid.
- If a removable protector is present, debris may be on top of or beneath it. Do not remove a bonded or manufacturer-installed layer.
- A mark in a normal screenshot viewed on another screen comes from the image or software, not surface dust or a failed physical pixel.
- A line, crack, spreading blotch, or cluster is not a one-pixel dust-versus-dead-pixel question. Stop testing and document it for service.
Use this order
- Power the display off and clean it only with the recommended soft, dry or lightly dampened cloth.
- Open white and inspect the edge and sharpness of the mark.
- Repeat red, green, blue, then black without pressing the screen.
- Take a screenshot and view it on a different display.
- If the point stays sharp and fixed, record its location and confirm it with the display’s own diagnostic.
Common questions
Can dust get inside a screen?
It can on some assemblies, but a browser cannot tell whether debris is on the surface, beneath a protector, or inside the panel. Do not open the display; document the mark and ask the manufacturer or repair provider.
Should I push the spot to see whether it moves?
No. Pressure can damage the panel and may complicate a return or support claim. Use color, angle, cleaning, and the built-in test instead.