How the test works
Each pixel on your screen is made of three sub-pixels: red, green and blue. By filling the screen with a single pure color at a time, any sub-pixel that's stuck on or off shows up as a dot in the wrong color. Cycle through all five test colors and click anything that looks off — the report combines those clicks into a likely diagnosis.
Dead vs stuck — what's the difference?
- Dead pixel: permanently off. Visible as a black dot on every color including white.
- Stuck-on pixel: sub-pixel locked bright. Visible as a red, green, blue or white dot on a black background.
- Stuck-off sub-pixel: shows as a darker dot only on certain colors (e.g. a green-only stuck pixel looks dark on red and blue).
Can stuck pixels be fixed?
Sometimes. Two methods often work for stuck (not dead) pixels:
- Pixel massage: turn the screen off, gently rub the spot with a microfiber cloth for ~30 seconds.
- Auto-cycle: use the Auto-cycle toggle above for 15–60 minutes. Rapid color changes can re-energize a stuck transistor.