Description
About Dead Pixel Test
Introduction
Dead Pixel Test fills the screen with solid colors so you can spot permanently dark or stuck subpixels with your eyes. It is a visual aid, not automated defect detection.
What this tool does
It paints full-screen (or near full-screen) solid fields, lets you cycle colors, and offers a rapid-cycle mode for quicker scanning. Photosensitivity and reduced-motion friendly defaults keep flashing optional and restrained. Dust moves when wiped; fixed dots do not.
When to use it
Use it in return windows, after panel pressure or replacement, and before events on borrowed monitors. Prefer Uniformity Test for blotchy backlight and Color Test for broader primary checks.
How it works
The browser composites solid CSS or canvas fills. Your panel either lights as commanded or shows fixed defects. Fullscreen hides chrome so edge columns are visible. Rapid cycle is an opt-in aid; static fields remain the calm baseline for documentation.
Step-by-step instructions
- Set the display to native resolution and 100% zoom, then enter fullscreen.
- Scan white, then red, green, and blue fields slowly in a grid.
- Check black for bright stuck neighbors; wipe the glass if a speck might be dust.
- Optionally use rapid cycle, then exit fullscreen when finished.
Common problems
Dust and cleaner residue mimic dead pixels. Phone photos add moiré. Taskbars hide edge defects until true fullscreen. Remote desktop compression invents false sparkles; inspect locally.
Privacy explanation
Patterns render locally. No camera permission is required. Screenshots you take for support stay under your control.