A dead pixel is a defective pixel that remains permanently black regardless of what's displayed on screen. Unlike stuck pixels, dead pixels cannot be fixed and indicate a hardware defect. Use our white screen test to identify dead pixels as black dots on a white background.

Display a solid white screen and look for black dots. Our white screen tool provides fullscreen testing with grid overlay to help you systematically scan your entire display. Test for 30-60 seconds per color to ensure thorough coverage.

Dead pixels are always black and cannot be fixed. Stuck pixels display a constant color (red, green, or blue) and sometimes respond to pixel fixing techniques. Use our multi-color testing tool to identify both types of pixel defects.

Yes! Our tool works on any device with a browser - smartphones, tablets, laptops, monitors, and TVs. Simply open our site and tap the white screen to begin testing your mobile display.

Most manufacturers allow 3-5 dead pixels depending on screen location and size. However, many premium monitors (ASUS, Dell, LG) offer zero-dead-pixel guarantees. Always check your warranty policy and test within the return window.

White screens find dead pixels. Black screens reveal backlight bleeding. Red, green, and blue screens test individual color channels for stuck pixels. Gray screens detect banding and uniformity issues. Complete testing requires all colors.

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Test each color for 30-60 seconds. Use the grid overlay to systematically scan the entire screen. Complete testing (all 6 colors) takes 3-5 minutes for thorough dead pixel detection.