How to use
- Clean the screen, then press Start (full screen).
- Use arrow keys or tap to change colours.
- Look closely for dots that don't match the colour.
Worked example
A stuck green subpixel shows as a bright green dot on the black and red screens.
Supported formats and limits
| Output | Full-screen test patterns |
|---|---|
| Engine | Fullscreen API with keyboard and tap navigation |
Limitations
- This is a visual check, not a hardware diagnosis. The optional flasher sometimes revives a stuck pixel, with no guarantee, and cannot fix a dead one; ask the manufacturer about warranty pixel policies.
Questions
What is the difference between a dead and a stuck pixel?
A dead pixel stays black and shows up on the white screen. A stuck pixel stays one colour and shows on black and on the other solid colours. Dust and marks usually move with your viewing angle; pixel defects stay in place.
Can the tool fix a stuck pixel?
The optional stuck-pixel flasher rapidly changes colour in a small square over the pixel, which sometimes helps a stuck pixel. There is no guarantee and it cannot fix a dead pixel. Read the photosensitivity warning before using it.
Privacy
Runs on your device. Files and text are processed in this browser tab and are not uploaded.
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