About Screen Dead Pixel & Monitor Diagnostic
Test computer monitors, laptop displays, and smartphone screens for defective pixels. Opens a full-screen diagnostic environment cycling pure solid Black, White, Red, Green, Blue, Cyan, Magenta, and Yellow test patterns.
Key Capabilities & Features
- Full-screen diagnostic mode
- 8 Calibrated solid primary and secondary test screens
- Keyboard and touch navigation (click/space to cycle)
- Assists in locating dead (black) and stuck (colored) subpixels
How to Use Screen Dead Pixel & Monitor Diagnostic
Start Test
Click Start Fullscreen Pixel Test.
Cycle Colors
Click the screen or press spacebar to inspect each color.
Exit
Press Escape to return to the browser window.
Privacy & In-Browser Execution Guarantee
Runs completely in your browser fullscreen mode.
Frequently Asked Questions
What is the difference between a dead pixel and a stuck pixel on an LCD/OLED screen?
A dead pixel is permanently unpowered and appears completely black on light backgrounds. A stuck pixel has one or two subpixels frozen in an on state, appearing as a bright red, green, or blue dot on contrasting backgrounds.
How does this full-screen tester reveal display defects?
The tester engages true full-screen mode and cycles through pure primary colors (Red, Green, Blue), solid White, and solid Black, making rogue pixels immediately conspicuous against uniform backgrounds.
Can this tool fix a stuck pixel on my monitor?
The tool includes a high-frequency pixel exerciser mode that flashes rapid RGB patterns over defective areas to stimulate stubborn liquid crystal molecules and unstick frozen subpixels.