How to Check Your Screen for Dead Pixels

Every LCD and OLED panel is built from millions of pixels, and manufacturing isn't perfect: a small number of panels ship with pixels that never light up (dead) or that stay locked on one color (stuck). The defect is easy to miss during normal use — a single dark dot hides easily in busy content — but once you notice it, you can't unsee it.

The time to test is when you still have options: within a retailer's return window for a new device, or before handing over cash for a secondhand monitor or phone. The full inspection takes under five minutes.

A dead pixel receives no power. It appears as a black dot on every background color and is essentially permanent.

A stuck pixel has one or more of its red, green, or blue subpixels frozen in the on state. It shows as a bright red, green, blue, or mixed-color dot, most visible on a black background. Stuck pixels sometimes recover on their own or with rapid color cycling.

Clean the screen first — a speck of dust looks exactly like a dead pixel until it wipes away. Then cycle the display through solid white, black, red, green, and blue in fullscreen, scanning the whole panel each time.

Inside a return window, the decision is easy: exchange the unit. For a warranty claim, check the manufacturer's pixel policy — many specify a minimum number of defective pixels before replacement, though premium 'zero bright dot' warranties cover a single stuck pixel.

For a stuck (not dead) pixel outside warranty, rapid color cycling over the affected area for 10–20 minutes occasionally revives it. It costs nothing to try.