To check for dead pixels, open a fullscreen screen test tool and cycle through solid color screens: red, green, blue, white, and black. On each color, slowly scan the entire display from corner to corner looking for dots that don't match the background color. A dead pixel stays black on all colors. A stuck pixel shows as a bright dot (usually red, green, or blue) that's always on. Most monitors allow 1-5 dead pixels before qualifying for warranty replacement — check your manufacturer's dead pixel policy. Test in a dimly lit room with brightness at a comfortable level for the best visibility. For new monitors or laptops, run this test immediately after unboxing so you can return it within the return window if defects are found. Set your display to its native resolution before testing.
How to Run a Dead Pixel Test
A dead pixel test cycles your screen through solid colors so defective pixels become visible against the uniform background.
- Open a fullscreen screen test tool.
- Cycle through solid colors: red, green, blue, white, black.
- Scan slowly from corner to corner on each color — dead pixels are easy to miss if you rush.
Dead Pixel vs Stuck Pixel
Not all pixel defects are the same. Understanding the type helps you decide whether the pixel can be fixed or needs a warranty claim.
- Dead pixel: always black on all colors — usually not fixable.
- Stuck pixel: one color always on (red, green, or blue) — sometimes fixable with a pixel exerciser tool.
- Hot pixel: always white — similar to a stuck pixel but all sub-pixels are on.
What to Do If You Find Dead Pixels
Finding dead pixels early gives you the best chance of getting a replacement under warranty or return policy.
- Check your manufacturer's dead pixel policy — most allow 1-5 dead pixels before warranty replacement.
- Document defective pixels with close-up photos for your warranty claim.
- Test immediately after unboxing new monitors to stay within the return window.