Instrument 04 ยท display
Dead pixel test
Six pure colors, fullscreen. Anything that refuses to change color is your answer.
Fullscreen colors cycle: white, black, red, green, blue, gray. Click, tap or press any key to advance; Esc exits.
Test the rest of your setup
How to read your results
Scan each full color slowly, edge to edge, ideally with the screen clean and the room dim. A dead pixel stays black on every color. A stuck pixel glows one color, easiest to catch on the black screen and on the two colors it is not. Subpixel faults show as a pixel that is the wrong color only on specific fields, which is why the test cycles pure red, green and blue.
What to do about what you find
- Stuck pixels sometimes recover: run a rapid color-flashing exercise over the spot for an hour, or apply gentle pressure with a soft cloth while the pixel's color field is displayed. Success is genuinely mixed, but it costs nothing.
- Dead pixels do not resurrect. Count them and check your panel's warranty class: many manufacturers replace panels above a defect threshold, and a fresh purchase inside the return window should go back for even one.
- Dust vs pixel: a dark speck that moves when wiped is dust; a defect never moves. Clean first, panic second.
- Clusters or lines: full lines are a controller or cable fault, not pixels. Reseat the cable first; it fixes more line faults than any other action.