Dead Pixel Test Guide
Dead pixels are permanently black dots on your screen that indicate a manufacturing defect. This page shows how to test for dead pixels using online tools. Start with the screen test to identify any pixel defects.
You can use the screen test to check for dead or stuck pixels.
Use Online Screen Test
The online screen test provides the most thorough pixel check.
- Open the screen test page
- Enter fullscreen mode for best results
- Cycle through solid colors: red, green, blue, white, black
- Look for black dots on colored backgrounds (dead pixels)
- Look for colored dots on black background (stuck pixels)
- Note the location of any defective pixels
What Are Dead Pixels
Dead pixels are permanently damaged and cannot be fixed.
- Dead pixels appear as black dots on any background
- They don't respond to electrical signals
- Dead pixels are a manufacturing defect
- They cannot be repaired
- Most manufacturers allow 1-3 dead pixels
What Are Stuck Pixels
Stuck pixels are different from dead pixels and may be fixable. If you find stuck pixels, see the guide on how to fix stuck pixels for repair methods.
- Stuck pixels appear as colored dots (red, green, or blue)
- They're permanently lit in one color
- Stuck pixels can sometimes be fixed
- Try pixel repair software or gentle pressure
- See the stuck pixel fix guide for repair methods
Test Different Colors
Test multiple colors to identify all pixel defects.
- Red background: Shows dead pixels and green/blue stuck pixels
- Green background: Shows dead pixels and red/blue stuck pixels
- Blue background: Shows dead pixels and red/green stuck pixels
- White background: Shows dead pixels clearly
- Black background: Shows stuck pixels clearly
Check Warranty Coverage
Most manufacturers have policies regarding dead pixels.
- Check your screen's warranty policy
- Most allow 1-3 dead pixels before replacement
- Some have zero dead pixel policies
- Document pixel locations with photos
- Contact manufacturer if pixel count exceeds policy
Test Your Screen
Use the online screen test to check for dead pixels. Enter fullscreen mode and cycle through colors to identify any pixel defects. Document any issues you find.
Open the screen test to confirm the issue is resolved.
Frequently Asked Questions
What is a dead pixel?
A dead pixel is a pixel on your screen that is permanently black and doesn't respond to signals. Dead pixels cannot be fixed and are considered a manufacturing defect. Most manufacturers allow 1-3 dead pixels before considering a screen defective.
How do I test for dead pixels?
Use the online screen test and cycle through solid colors (red, green, blue, white, black). Dead pixels appear as black dots on colored backgrounds. Stuck pixels appear as colored dots (red, green, or blue) on black backgrounds.
Can dead pixels be fixed?
Dead pixels cannot be fixed as they are permanently damaged. However, stuck pixels (pixels stuck in one color) can sometimes be fixed using pixel repair software or gentle pressure techniques.
Use the online screen test to check your display for issues.