Dead Pixels Test

To check the monitor for defective pixels, start our test.

Click the "►" button in the test panel.

Test Pattern
Defective Pixels
Uniformity
Color Distances
Sharpness
Gradients
Gamma
Response Time
The functionality is not available for your screen width. The test can only be performed on a desktop monitor.
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Check the monitor for any malfunctioning pixels. Each pixel should be showing black. If you notice any colored illumination within a pixel, it indicates a subpixel that is persistently lit.
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Verify whether there are any faulty pixels on the monitor. Every pixel ought to display white. If you observe a black pixel, it signifies a pixel that's absent.
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Verify for any malfunctioning pixels on the monitor. Every pixel ought to display in red. The presence of a black pixel signifies the absence of the red subpixel.
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Verify for any faulty pixels on the screen. Each pixel ought to emit a green hue. Should you come across a black pixel, it suggests the absence of the green subpixel.
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Verify for any faulty pixels on the monitor. Every pixel ought to display blue. The presence of a black pixel denotes the absence of a blue subpixel.
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Evaluate the consistency of the image by employing different shades of gray. Ensure that brightness is uniformly dispersed throughout the entire image, with no presence of vibrant hues.
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Evaluate the consistency of the image by employing different shades of gray. Ensure that brightness is uniformly dispersed throughout the entire image, with no presence of vibrant hues.
Tap this screen to open the following screen
Evaluate the consistency of the image by employing different shades of gray. Ensure that brightness is uniformly dispersed throughout the entire image, with no presence of vibrant hues.
Tap this screen to open the following screen
Evaluate the consistency of the image by employing different shades of gray. Ensure that brightness is uniformly dispersed throughout the entire image, with no presence of vibrant hues.
Tap this screen to open the following screen
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Assess your monitor's ability to accurately reproduce similar colors while maintaining their distinction. To do this, create two color patches. The closer the similarity between the two colors, but the more distinguishable they are, the higher the monitor's color resolution. This score is especially useful for comparing the color reproduction capability of two different monitors directly.

Background Color




Figure color




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This assessment enables you to ascertain if your monitor can render text crisply and devoid of any blurring or shadows, irrespective of other factors like text anti-aliasing.

Font size


Inversion

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The gradient should be as smooth as possible, without unnecessary noise or other colors. Check the gradient display with different colors.

Select gradient


Inversion

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Determine the gamma value of your monitor. Use the slider to change the grayscale of the shape so that it blends as much as possible with the background below. The displayed value corresponds to the gamma value of your monitor.

Gamma:
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Select the refresh rate of your monitor, or the frequency you want to work with, and see how smoothly each new block appears.

Speed (per sec):
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Dead or defective pixels are small dots on your screen that don’t work properly. Instead of showing the correct colors, they show up as odd-looking dots. These can be distracting when watching movies, playing games, or editing photos. The issue may show up as a pixel that stays one color, never lights up, or appears too bright.

Check our online monitor test.

Types of Defective Pixels

  1. Stuck Pixels – These are pixels that get stuck showing just one color—like red, green, blue, or white—and don’t change no matter what’s on the screen.
  2. Dead Pixels – Dead pixels always appear black. They’re not getting any power, so they stay dark even if your screen is bright and colorful.
  3. Hot Pixels – Hot pixels are always bright and usually show as tiny white dots on your screen, even when they shouldn’t.

What Causes Pixel Problems?

  • Factory Issues – Some screens come with pixel problems right out of the box.
  • Physical Damage – Drops, pressure, or scratches can break pixels.
  • Heat or Electrical Problems – Too much heat or power glitches can damage pixels.

Importance of Testing for Dead Pixels

Warranty Coverage
If your screen has too many faulty pixels, the manufacturer might repair or replace it—depending on their policy. Catching this early can help you get support before your warranty ends.

Better Experience
Pixel issues can be annoying when you’re trying to enjoy content. Testing helps you spot and fix them so your screen looks the way it should.

Whether it’s a brand-new screen or one you’ve had for a while, running a quick test is a smart move.

Manual Testing

Manual Testing

  1. Full-Screen Solid Color Tests. The full-screen solid color test is like shining a spotlight on your screen to reveal any hidden troublemakers. It’s done by showing solid colors like red, green, blue, white, and black across the whole screen. Defective pixels stand out as little dots that don’t change color. Here’s how to do it:
    • Open your favorite drawing app (like MS Paint or something similar).
    • Create a blank canvas and fill it with a single color.
    • Change the background color one by one: red, green, blue, white, and black.
    • Look closely at the screen for any odd spots.
  2. Magnifying Glass Method. For a closer look, a magnifying glass can help spot those tiny pixel problems! Simply:
    • Turn your screen to a solid color.
    • Use a magnifying glass to examine each corner of your screen.
    • Look for any odd dots that don’t match the background.

Software Testing Tools

Software Testing Tools

Use Dead Pixel Text on Allcolorscreen.com or similar online tools. Just visit the site, run the test, and watch for anything unusual.

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