TESTING GUIDE

How to Test for Dead and Stuck Pixels

A browser-based dead pixel test works by drawing uniform color fields that make abnormal physical pixels easier for a person to notice. The browser supplies the test image; the user performs the hardware inspection.

Clean first

Dust, dirt, and surface marks can mimic pixel problems. Clean the display safely before interpreting a tiny dark or bright point as a hardware defect.

Use contrasting colors

Black makes persistent bright or colored points easier to notice. White and other bright fields can expose persistent dark points. Red, green, and blue isolate primary color channels; cyan, magenta, yellow, and gray provide additional comparison fields.

Dead versus bright or stuck appearance

A dark pixel may remain dark against bright backgrounds. A bright or stuck pixel can remain illuminated or display an unexpected color against dark or contrasting backgrounds. These descriptions are visual observations, not an automatic diagnosis of the electronics behind the panel.

Fullscreen behavior

Fullscreen reduces browser chrome and makes more of the physical panel available for inspection, but browsers can reject or exit fullscreen. A truthful test must keep working in windowed mode when that happens.

Why there is no automatic detector

JavaScript can control browser-rendered colors but cannot query the physical LCD or OLED panel and ask whether a particular hardware pixel is defective. That is why the app does not report a defect count or pass/fail score.

What to do after finding a suspicious point

Clean and recheck the same location across multiple colors, compare it with surrounding pixels, avoid pressing hard on the panel, and review the current pixel/warranty policy for your exact display model.

What this test does not cover

Refresh rate, touch response, color calibration, backlight uniformity, burn-in diagnosis, GPU/cable faults, and warranty thresholds are separate jobs.