RGB Screen Test

A stuck pixel frozen on red vanishes on a red field but glows on black, green and blue. A dead subpixel vanishes into the background only on its own colour. That is why the full test cycles all nine colours: white confirms dead pixels, black exposes stuck ones, and red, green and blue name the channel.

Cyan, magenta, yellow and grey then catch what the primaries miss — a fault invisible on one colour often stands out on another.

Press Start Test on the main page and step through red, then green, then blue with Next, the arrow keys, Space, or a sideways swipe on touch screens. On each field look for any dot that does not match — dark on a bright field, glowing on a dark one.

Press H to hide the controls and check edges and corners on each colour, then Exit to finish. The three-field pass takes under half a minute.

Note which colour showed the dot and which it matched: for example, glowing red on black and blue but invisible on red points at a red-channel fault. Mark the approximate spot on the screen map and download the text summary.

The file is a “User-reported visual inspection” note with the date and colours inspected. It records what you reported — it does not capture, verify or prove a physical defect.