Pixel test screen
Current color: Black (1 of 5). Click the screen or press space to change color.
Press Esc to leave fullscreen. Test in a dark room and check edges and corners.
Spot dead and stuck pixels by cycling your screen through black, white, red, green and blue. Click or press space to change colors, or go fullscreen to inspect the entire panel edge to edge.
Current color: Black (1 of 5). Click the screen or press space to change color.
Press Esc to leave fullscreen. Test in a dark room and check edges and corners.
A dead pixel never lights up and stays black on every color, a stuck pixel freezes on one subpixel color (often red, green or blue), and a hot pixel stays white. Cycling the whole screen through black, white, red, green and blue makes each defect stand out as a dot that refuses to change with the background.
Run the test in a dark room and inspect the screen closely on each color, especially black and white. Use fullscreen to cover the entire panel including edges. Stuck pixels sometimes unstick after rapidly flashing colors for a few minutes; truly dead pixels are a hardware fault covered by the panel warranty.