Black dot
- Input
- Tela branca
- Expected output
- Ponto escuro que não muda: pixel morto
Also confirm on the red, green and blue screens. If the dot disappears on one of them, it is just one dead subpixel.
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dead pixel test full screen
Before buying a used monitor, when unboxing a new laptop or when a strange dot shows up on the screen, the fastest way to tell whether it is a defect is to cover the whole screen with one color at a time. This page opens the tool ready to go: one button starts the full-screen sequence.
Also confirm on the red, green and blue screens. If the dot disappears on one of them, it is just one dead subpixel.
A stuck pixel sometimes frees up with Stuck pixel mode, which cycles colors over the dot at most 3 times per second.
A dead pixel is always off (black). A stuck pixel is always lit in one color, usually red, green or blue, because one subpixel does not change. A hot pixel is always white. In every case the dot does not follow the screen color, which is exactly what the test reveals.
No. The test runs straight in the browser, on any device with a screen. Click or tap Start full screen, step through the colors and press Esc to exit.
It depends on the manufacturer and model pixel policy. Check the brand policy before complaining and note where the dot is so you can show support.
Look for dots that do not change color.
Everything runs in your browser. No image or data leaves your device; analytics only records which action was used.