What dead and stuck pixels are
A dead pixel stays dark on every color. A stuck pixel stays lit in one color (often red, green or blue). Both show up best against solid backgrounds.
How to run the test
- Clean the screen first so dust isn't mistaken for a pixel.
- Open fullscreen and press → or tap to move through each color.
- Look slowly across the whole display at each color, from a normal distance and then closer.
- Note where any odd dot appears and which colors it shows on.
Limits of a visual test
This is a visual check done by you, not an automatic diagnosis. The website can't read your hardware; it only shows colors so you can spot problems yourself.
If you find a faulty pixel
- Check your manufacturer's or shop's pixel policy and warranty.
- Take a close-up photo showing the dot on a solid color.
- Stuck pixels sometimes recover on their own; dead pixels usually don't.
Frequently asked questions
How many colors should I check?
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At least black, white, red, green and blue. The test cycles through these and more.
Can the test fix pixels?
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No. It helps you find them; it doesn't repair anything.
Does it work on phones and TVs?
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Yes, in any modern browser. On a TV, open the page in its browser or cast a tab.