Dead Pixel Test
Fill your screen with solid colours and look for dots that do not change. Then try the stuck pixel fixer on anything you find.
Clean the screen first; a speck of dust looks exactly like a dead pixel on white. On a phone, rotate to landscape and use the Exit button in the corner.
Stuck pixel fixer
A stuck pixel is one that shows a fixed colour. Colour cycling is an experiment with no guaranteed repair; it cannot repair physical panel damage. Drag the box over the pixel and leave it for the full 10 minutes.
Three steps. You’re in.
- Wipe the screen, then press "Start test". The page goes fullscreen white.
- Click, tap or press an arrow key to move through black, red, green, blue and a gray ramp. Look for dots that stay the same colour on every screen.
- Press Esc or the Exit button when done. If you found a stuck (coloured) pixel, start the fixer and drag the flashing box over it.
Dead vs stuck pixel
Displays use sub-pixels to form colours, and a persistent dot can have several causes. A dark dot on bright backgrounds may be a non-working pixel or sub-pixel; a coloured or bright dot may be stuck on. Clean the surface gently and compare several test colours before reporting it. A browser test cannot determine the exact electrical fault or whether it is repairable. Record the location and check the manufacturer’s support guidance.
Dead pixel on a laptop screen: what to do
Clean the screen gently with a suitable cloth, then repeat the test. Note the location and number of defects and photograph them against several colours. Warranty thresholds vary by manufacturer, model and region; check the policy for your exact display or contact its support team. Avoid pressing on or opening the panel.
Test a phone screen
Open this page on the phone and start the test. If fullscreen is unavailable, the colours cover the page area only; browser controls can leave part of the panel untested. Rotate the device if useful and use the Exit button. Compare several solid colours and photograph persistent defects for the manufacturer. Image retention or burn-in can cover larger areas than a single pixel.
Does the stuck pixel fixer work?
Colour cycling is sometimes tried for stuck pixels, but this site has no measured success rate and cannot promise a repair. It cannot fix physical panel damage or burn-in. The experiment stops after ten minutes; stop sooner if the flashing is uncomfortable. Do not press or rub the panel in an attempt to repair it. Consult the manufacturer if the defect persists.
Frequently asked questions
Why does fullscreen not work on my iPhone?
Fullscreen availability depends on your browser and device. If the browser refuses fullscreen, the test fills the page area. Rotate the phone if useful and use the Exit button; areas occupied by browser controls are not tested.
What if the dot is only on one colour?
A defect visible on some colours can involve a sub-pixel, but this visual test cannot confirm the cause. Compare all solid colours, note the location and take photographs for the manufacturer. Do not assume that colour cycling will repair it.
Is one dead pixel covered by warranty?
Coverage depends on the manufacturer, model and region. Check your exact display’s pixel policy and contact support with photographs of the defect.
How long should I run the stuck pixel fixer?
The experiment stops after ten minutes. Retest with the solid colours afterward. There is no guaranteed recovery time or success rate; contact the manufacturer if the defect remains.
Can the fixer damage my screen?
It displays changing pixel colours and cannot repair physical damage. Follow your display manufacturer’s guidance, avoid pressing on the panel, and do not run the flashing experiment if you are sensitive to flashing light.
Why do I see faint darker or lighter patches on the gray screen?
Uneven patches can reflect display uniformity, viewing angle, image retention or other issues. The test cannot identify the cause or determine warranty eligibility. Compare at normal viewing conditions and consult the policy for your exact model.
Does the test work on a TV or a second monitor?
Yes. Drag the browser window to that screen before pressing Start; fullscreen uses whichever display the window is on.