How to read your result
Each pixel on your screen is made of tiny red, green and blue parts called subpixels. A solid color makes a faulty one easy to see. Wipe the screen first, then look over the whole screen on each of the six colors: black, white, red, green, blue and gray.
| What you see | Color that shows it most | What it is |
|---|---|---|
| A black dot that stays black on every color | White and gray | Dead pixel. It never lights up. |
| A bright dot that stays red, green, blue or white | Black | Stuck pixel. One or more subpixels are always on. |
| A dark dot on only one color, such as red | That color | Stuck-off subpixel. One part of the pixel never turns on. |
Dust can look like a dead pixel. Dust usually looks soft and moves or disappears when you wipe the screen gently. A faulty pixel stays sharp and in the same place.
Auto-advance changes the color for you every 1, 2 or 5 seconds. It never changes faster than once a second, well below the rate that counts as flashing.
If you find a dead or stuck pixel on a new screen, check the seller’s return policy and the manufacturer’s pixel policy. They decide how many faulty pixels qualify for a replacement.
Troubleshooting
Full screen didn’t open on my iPhone
Safari on iPhone doesn’t let web pages go full screen. The test fills the browser window instead and hides the page controls. The address bar and toolbar stay visible, so the screen behind them isn’t tested. Turn the phone sideways to see more of the screen at once.
How do I leave the test?
Press Esc on a keyboard, press the Exit button in the help bar, or press and hold anywhere on the color for a moment. Moving the mouse or pressing Tab shows the help bar again.
Can a stuck pixel be fixed?
A dead pixel can’t be fixed by software. A stuck pixel sometimes recovers on its own. Some videos and sites try to fix stuck pixels with very fast flashing colors. Kensa Lab doesn’t offer that, because fast flashing can be unsafe for some people. Contact the seller or manufacturer instead.
The black screen has light around the edges
On LCD screens, light leaking around the edges on black is called backlight bleed. It is not a dead pixel. A little is normal on many screens.
The colors look tinted
Night modes and automatic color adjustments change how colors look. Turn them off while you test.
- Windows: Settings, then System, then Display. Turn off Night light.
- Mac: System Settings, then Displays, then Night Shift. Turn it off, and turn off True Tone if your Mac has it.
- iPhone and iPad: Settings, then Display and Brightness. Turn off Night Shift and True Tone.
- Android: Settings, then Display. Turn off Night Light, Eye comfort or a similar mode.
Privacy
The test only draws colors on your screen. It uses no camera, saves nothing and sends nothing. How it works