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Dead Pixel Checker

Test your screen for dead, stuck, or hot pixels with different colors in full screen mode.

How to use:

  1. Click the "Start Test" button below to enter full-screen mode
  2. Use arrow keys or click anywhere to cycle through different colors
  3. Look carefully for any pixels that don't match the displayed color
  4. Move your mouse to show/hide controls
  5. Click X button or press ESC key to exit full-screen mode

The test will cycle through the following colors:

Test your screen for dead or stuck pixels by displaying solid colors in full-screen mode. Dead pixels will appear as black dots, while stuck pixels may show up as a constant color regardless of the background.


Frequently Asked Questions

What is a dead pixel and how can I identify it on my screen?
A dead pixel is a malfunctioning picture element (pixel) in an LCD, LED, or OLED screen that remains permanently black due to a manufacturing defect or damage. Unlike stuck pixels which may display a constant color, dead pixels are completely unresponsive and appear as black dots on the screen. They're most visible against light-colored backgrounds, especially white.
How do I use this dead pixel checker tool effectively?
To use the dead pixel checker effectively: 1) Click the 'Start Test' button to enter full-screen mode 2) Use arrow keys or click to cycle through different colors 3) Look carefully for any pixels that don't match the displayed color 4) Move your mouse to show/hide controls 5) Press ESC or click the X button to exit full-screen mode. Test with multiple colors as dead pixels may be more visible against certain backgrounds.
What's the difference between dead pixels, stuck pixels, and hot pixels?
Dead pixels are completely unresponsive and appear black, while stuck pixels are permanently lit in a specific color (usually red, green, or blue). Hot pixels, commonly found in camera sensors, appear brighter than surrounding pixels and may only show up in long exposures. Stuck pixels may sometimes be fixed using pixel massage techniques, but dead pixels typically require screen replacement.
Can dead pixels be fixed or repaired?
True dead pixels cannot typically be fixed as they represent physical damage to the display's transistor. However, stuck pixels (which appear as a constant color) might be fixable using specialized software, gentle physical pressure, or pixel-refreshing videos. If your screen is under warranty, contact the manufacturer for repair or replacement options. Some manufacturers have specific policies about the number of dead pixels required for warranty coverage.
Why should I test my screen with different colors?
Testing with different colors helps identify various types of pixel defects. Dead pixels appear black on all colors, while stuck pixels might only be visible against certain backgrounds. White backgrounds help spot dark defects, while black backgrounds make it easier to see bright stuck pixels. Red, green, and blue tests can help identify which sub-pixel components are malfunctioning.
How many dead pixels are acceptable on a new monitor?
The acceptable number of dead pixels varies by manufacturer and display grade. ISO 13406-2 standards define different classes of displays: Class 1 allows zero defects, while Class 2 and 3 allow some dead pixels based on screen resolution. Most consumer displays are Class 2, typically allowing 2-5 dead pixels per million pixels. Check your manufacturer's dead pixel policy for specific warranty coverage details.
What causes dead pixels on LCD and LED screens?
Dead pixels can be caused by manufacturing defects, physical damage, or electrical faults. In LCD screens, they occur when the transistor controlling a pixel fails, preventing it from receiving power or signals. In LED displays, it might be due to a broken LED element or connection. Physical pressure, impact damage, or electrical surges can also cause pixels to die during normal use.
How often should I check my screen for dead pixels?
It's recommended to check your screen for dead pixels: 1) Immediately after purchasing a new display (within the return window) 2) Monthly for professional displays used in color-critical work 3) When you notice any visual anomalies 4) Before and after moving or transporting your display. Regular checks help identify issues early while they might still be covered under warranty.