Manual display inspection
Dead Pixel Test
Fill the test area with clean, solid colors and inspect the same spot across each field. Works in the viewport, with optional browser fullscreen when supported.
Visual aid only: this page cannot read physical pixels, diagnose a panel automatically, or repair a defect.
White
#FFFFFF · 1 of 6
Dark or discolored points are easiest to compare on this bright field.
Ready: White selected. Inspect slowly, then compare the same spot on other colors.
Keyboard after focusing the test: ←/→ change color · 1–6 select directly · F fullscreen · Space starts/stops the timer · H hides/shows fullscreen controls · Esc exits fullscreen. On touch screens, use the buttons or swipe left/right.
Checking fullscreen support…
How to use
- Clean first. Power the display off and use the maker’s recommended cleaning method. Dust and fingerprints can look like bad pixels.
- Set up the real viewing path. Move this browser window onto the display you are checking. Disable temporary overlays and inspect at your normal viewing distance.
- Compare fields. Scan White, Black, Red, Green, Blue, and Gray slowly, including edges and corners. Recheck every suspicious point on several colors.
- Use fullscreen only if helpful. It is requested only when you press the button or F. If unavailable or denied, the large viewport field remains usable.
How to interpret what you see
- Possible dead or dark pixel: a tiny point stays dark in the same physical location on bright and primary-color fields.
- Possible stuck or bright subpixel: a point stays lit or keeps a fixed color as the field changes, often standing out most on Black.
- Dust or a smudge: the mark has an irregular edge, changes with viewing angle, or moves/disappears after safe cleaning.
- A larger patch, glow, or ghost: that is not a single-pixel finding and may involve uniformity, viewing angle, or image retention. This test does not identify its cause.