Red Screen Dead Pixel Test
A red screen reveals dead pixels as black dots, and shows stuck blue or green sub-pixels clearly. Stuck red sub-pixels blend into this background — use blue or green to find those.
Red screen test
Look for black dots (dead pixels) and any blue or green dots against the red background. Go full screen for the most accurate result.
Press F11 for best results on desktop
What each dot type means on a red screen
| What you see | Type | Action |
|---|---|---|
| Black dot | Dead pixel (transistor off) | Document and check warranty |
| Blue dot | Stuck blue sub-pixel | Try the fix tool |
| Green dot | Stuck green sub-pixel | Try the fix tool |
| Nothing unusual | No detectable defect on red | Also test black & white |
| Red dot hiding | Stuck red (invisible here) | Test on blue or green screen |
Test on other colors too
Each color hides one type of stuck pixel and reveals the others. A complete test uses all seven colors.
Run the full 7-color dead pixel test →Frequently asked questions
What does a red screen dead pixel test reveal?+
Dead pixels (black dots), stuck blue sub-pixels (blue dot on red), and stuck green sub-pixels (green dot on red). Stuck red sub-pixels blend into the background and are hidden — use blue or green to find those.
Why does a stuck red pixel hide on a red screen?+
A stuck red pixel emits red light, which blends into the red background. Every stuck pixel type hides on one color and is visible on all others — that's why you need to test on multiple colors.
What color should I use to find stuck red pixels?+
Blue or green screen tests clearly show stuck red sub-pixels as a red dot on the contrasting background. The black screen also works — any stuck pixel shows as a bright dot on black.
Can stuck pixels be fixed?+
Sometimes. Run the fix tool for 10–20 minutes — rapid color cycling can stimulate stuck transistors back into operation. Dead pixels (always black, visible as dots on colored screens) cannot be fixed with software.