Dead Pixel Test
Find faulty pixels with solid colors
Dead Pixel Test
Fill the screen with solid colors to find faulty pixels. Look for dots that differ (bright or dark) on each color.
Tap a color to fill the whole screen. Tap the screen to go to the next color; press ESC or the X to exit.
FAQ
What is a dead pixel?
A screen pixel that is permanently off (a black dot) or stuck on one color. It appears as a dot that differs from its surroundings on a solid background.
Dead pixel vs stuck pixel?
A dead pixel is fully off and appears black; a stuck pixel is fixed on one color (red, green, blue, etc.). Stuck pixels sometimes recover.
How do I test?
Display solid red, green, blue, white, and black in turn, and look for dots that differ on each color. Wipe the screen to rule out dust.
Useful when buying a new monitor or phone?
Yes. Testing right after purchase helps you catch faulty pixels and check return eligibility. Manufacturers have different dead-pixel policies.
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