Dead pixel test
Fill your whole screen with solid colours to spot dead or stuck pixels — plus a fixer mode that flashes colours to try to revive stuck ones.
Pick a colour to fill the screen:
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What this dead pixel test checks
Flooding the screen with solid colours one by one is the most reliable way to spot a single faulty pixel among millions. The built-in fixer then flashes colours rapidly over a stuck pixel to try to coax it back to life.
Dead vs. stuck, and the fixer
A dead pixel stays black on every colour and usually can't be recovered; a stuck pixel stays lit in one colour and sometimes can. If you find a stuck pixel, run the fixer over that spot for several minutes — rapid colour changes occasionally revive it. There's no guarantee, but it's completely harmless to try.
How to use it
- 1Pick a colour, or press 'Start dead pixel test' to fill the screen with white.
- 2Click to step through white, black, red, green, blue and more — inspect the screen on each.
- 3A dot that stays black on every colour is a dead pixel; one stuck on a colour is a stuck pixel. Try the fixer on stuck ones.
Frequently asked questions
- What is the difference between a dead and a stuck pixel?
- A dead pixel stays black on every colour; a stuck pixel stays lit in one colour. Stuck pixels can sometimes be revived, dead ones usually cannot.
- Does the stuck pixel fixer really work?
- Sometimes. Rapidly flashing colours can nudge a stuck pixel back to life — leave it running over the stuck spot for several minutes. There is no guarantee, but it is harmless to try.
- Why fill the screen with one colour?
- A faulty pixel is easiest to see against certain colours — a stuck red pixel hides on a red screen but stands out on black or green.
- How long should I run the fixer?
- Leave it over the stuck pixel for at least 10–20 minutes; some people run it for an hour or more. Results vary.
- Could the fixer damage my screen?
- No — it only changes colours rapidly, something your screen does constantly anyway. It's safe to try.
- My new device has a bright dot — is that covered by warranty?
- Many manufacturers only replace a panel above a certain number of faulty pixels; check your warranty's dead-pixel policy.