What is a dead pixel?
A dead pixel is a screen pixel that no longer responds and stays black no matter what image is shown. On LCD and OLED displays, each visible point is made of subpixels that switch color and brightness. When that hardware fails, one pixel can stop updating and become permanently dark. Many users search for a dead pixel test after buying a new monitor, checking a laptop panel, or inspecting a phone screen. A dead pixel checker helps reveal these defects by filling the entire display with one solid color at a time. When the screen becomes red, green, blue, white, black, cyan, magenta, or yellow, a bad point usually stands out immediately against the clean background. This kind of pixel test is simple, fast, and much more reliable than trying to inspect defects on a busy desktop wallpaper or inside a video. If you suspect a broken pixel, hot pixel, or dead pixel on monitor panels, a fullscreen screen test is the easiest first diagnostic step.
How to use this dead pixel test
Start the dead pixel test and switch to fullscreen for the most accurate result where your browser allows it. The tool shows one solid test screen color at a time so you can inspect the panel carefully. Move close enough to notice tiny defects, but not so close that you miss bigger uniformity issues. Check black, white, red, green, and blue slowly. A dead pixel may appear black across multiple colors. A hot pixel often appears permanently bright and becomes easier to notice on black. A stuck pixel may stay red, green, or blue instead of changing correctly. Use the arrow keys, on-screen controls, or spacebar to move through the sequence. On phones, landscape mode usually makes the test area easier to inspect, and on iPhone the browser may not allow true fullscreen. If you find a suspicious spot, repeat the cycle a second time to confirm it is really part of the panel and not dust, compression noise, or glare. This dead pixel check works completely in the browser, so there is no software to install.
Dead pixel vs stuck pixel vs hot pixel
People often use these terms interchangeably, but they are not the same. A dead pixel is usually fully black because the pixel no longer lights up at all. A stuck pixel remains fixed in one color because one or more subpixels are locked, which means it may show as red, green, blue, or another bright tint during a monitor dead pixel test. A hot pixel is usually permanently bright and is easiest to see on black or very dark screens. This difference matters because it changes how you interpret what you see during the color cycle. A dead pixel stays dark on every color. A stuck pixel stays tinted. A hot pixel stays bright. The most reliable way to judge the issue is to inspect the same point across black, white, red, green, and blue screens.
Manufacturer warranty for dead pixels
Warranty treatment for dead pixels depends on the panel type, brand, region, and exact policy. Some manufacturers replace a monitor for a single bright defect, while others allow a small number of defective pixels before they approve service. Many policies historically referenced ISO 13406-2 style classifications, which grouped panel defects into classes, although modern vendor policies may use their own wording instead. If you discover a dead pixel on a new monitor, laptop, or phone, take screenshots of the purchase details, record the serial number, and run a clear dead pixel monitor test like this one before contacting support. Check the brand warranty page from Dell, ASUS, Apple, or the specific manufacturer for their current threshold. The more clearly you can show the issue on white, black, red, green, and blue test screen backgrounds, the easier it is to document the problem. If the display is still inside the return window, replacing it through the retailer is often simpler than waiting for warranty service.
FAQ
What is a dead pixel?
A dead pixel is a pixel that no longer responds and stays dark on every color. It usually appears as a tiny black dot during a dead pixel test.
What is the difference between a dead, stuck, and hot pixel?
A dead pixel stays black, a stuck pixel stays on one color, and a hot pixel stays unusually bright. Checking the same spot across several colors helps confirm what type of defect you are seeing.
How does this dead pixel test work?
The tool fills your display with solid fullscreen colors so defects become easier to see against a clean background.
Can a dead pixel be fixed?
A true dead pixel usually cannot be fixed in software. This tool focuses on helping you confirm what type of defect you are seeing.
Will this test damage my screen?
The fullscreen color test itself is safe for normal use. If bright fullscreen colors feel uncomfortable, stop and continue more slowly.
Should I claim warranty for one dead pixel?
That depends on the manufacturer policy and your return window. Some brands accept one bright defect, while others require more than one affected pixel.
How does ISO 13406-2 classification work?
ISO 13406-2 was a display standard that grouped panel defects into classes with different acceptable limits. Some vendors still reference similar logic in their policies.
Why are dead pixels more visible on certain colors?
Contrast makes them easier to notice. A black defect stands out strongly on white or bright colors, while a bright hot pixel is easiest to see on dark backgrounds.