Dead Pixel Test
A way to detect screen defects. Cycle through primary colors in fullscreen mode to identify hardware issues.
Pro Tip: Use the arrow keys to cycle colors in fullscreen mode. Look closely for any dots that don't match the background color.
Description: What is a Dead Pixel?
A dead pixel is a hardware defect on a liquid crystal display (LCD) or OLED screen where a single pixel fails to receive power, resulting in a black dot.
In modern high-resolution displays, a single dead pixel can be difficult to spot. The 16kpixel Dead Pixel Test simplifies this process by filling your entire screen with solid colors. By removing visual noise, any pixel that isn't behaving correctly becomes apparent.
There are three main types of pixel defects:
- Dead Pixels: Pixels that are permanently off (black).
- Stuck Pixels: Pixels that are permanently on one color (Red, Green, or Blue).
- Hot Pixels: Pixels that are permanently white.
How It Works: The Diagnostic Process
To perform a thorough test, you must inspect your screen under different color conditions. Each color reveals a different type of sub-pixel failure.
The 5-Step Inspection
- White: Best for finding dead (black) pixels.
- Black: Best for finding stuck (colored) or hot (white) pixels.
- Red: Tests the red sub-pixel transistors.
- Green: Tests the green sub-pixel transistors.
- Blue: Tests the blue sub-pixel transistors.
Preparation Tips
Before starting the test, ensure your screen is clean. A speck of dust can be mistaken for a dead pixel. Use a microfiber cloth to gently wipe the surface.
Once clean, enter Fullscreen Mode using our tool. This removes the browser UI, allowing you to inspect the edges of your panel.
Frequently Asked Questions (FAQ)
Can a dead pixel be fixed?
True dead pixels are usually permanent hardware failures. However, stuck pixels can sometimes be "massaged" back to life using software that rapidly cycles colors.
Does my warranty cover dead pixels?
Most manufacturers have a "Pixel Policy." Usually, they won't replace a monitor for just one dead pixel. They often require a minimum number before authorizing a return.
Is a dead pixel the same as screen burn-in?
No. Burn-in is a ghost-like image that remains on the screen after a static element has been displayed for too long. A dead pixel is a single point of failure.
Why do dead pixels happen?
They are usually the result of manufacturing defects. They can also occur later due to physical shock or heat stress.