How to Test for Dead Pixels on Any Monitor

Before launching any pixel test, thoroughly clean your display glass. Dust specks, dried spit marks, and fingerprints easily mimic dead pixels when viewed straight on.

Power down the monitor so the panel is cool and dark. Use a dry, clean microfiber cloth with light circular motions. Never spray liquid directly onto the monitor surface; dampen the cloth with distilled water or an electronics-safe screen cleaner if stubborn grime persists.

Open the ScreenCheck Dead Pixel Test and enter browser fullscreen mode (F11 on Windows, Ctrl+Cmd+F on macOS, or click the fullscreen button). Browser toolbars and taskbars must be completely hidden to uncover perimeter pixels.

Cycle slowly through pure solid backgrounds: Black (0%), White (100%), Red, Green, Blue, and neutral grays (5%, 25%, 50%).

Position your eyes 30 to 45 centimeters from the screen. Scan methodically in a grid pattern: top-left across to top-right, then down row by row.

Dead Pixel: The transistor is non-responsive or has lost power. It will show up as a tiny pitch-black dot against pure white, yellow, cyan, and light gray fields.

Stuck Subpixel: One subpixel (Red, Green, or Blue) remains permanently open. It stands out brightly as a colored needle-point against a pure black or dark gray screen.

Hot Pixel: All three subpixels are stuck permanently on, glowing pure white even on a pure black background.

Most consumer monitors follow ISO 9241-307 Class II guidelines. Under Class II, manufacturers typically permit up to 2 permanently bright pixels, 2 permanently dark pixels, or 5 defective subpixels per million pixels before considering the panel defective.

However, "Zero Bright Dot" (ZBD) warranties specifically cover even a single stuck bright subpixel within the first 30 to 90 days. Always check your retailer or manufacturer return window immediately upon unboxing.