Dead Pixel Checker
Inspect your screen for defective pixels. Clean your screen first!
Instructions: Click "Start Test", then use Arrow Keys or Click to cycle colors. Press ESC to exit.
What is a Dead Pixel?
A Dead Pixel is a pixel on your display that fails to turn on, appearing as a permanent black dot. It typically results from a manufactured defect where the transistor powering the pixel is broken.
Dead pixels are most noticeable on white backgrounds, while Stuck Pixels are visible on black backgrounds.
Types of Defects
- Dead Pixel: Always black (power cut). Rare on OLEDs, common on LCDs.
- Stuck Pixel: Stuck showing Red, Green, or Blue. Often caused by a transistor stuck "ON".
- Hot Pixel: Always white. All three sub-pixels (RGB) are stuck ON.
How to Use This Tool
- Click Start Test to enter full-screen mode.
- The screen will turn a solid color (e.g., White).
- Scan your screen closely for any tiny dots that are not white.
- Click or use Arrow Keys to switch to Red, Green, Blue, and Black.
- Repeat the scan for each color to find different types of stuck pixels.
Can Dead Pixels Be Fixed?
Dead Pixels (Black): usually permanent and cannot be fixed.
Stuck Pixels (Colored): sometimes fixable! You can try:
- Pixel Massage: Gently apply pressure to the area with a soft cloth (at your own risk).
- Color Cycling: Flashing colors rapidly for hours can sometimes "unstick" the transistor.
Frequently Asked Questions
Is 1 dead pixel acceptable?
It depends on the manufacturer's warranty. Class I monitors allow 0 defects. Most consumer monitors (Class II) allow 2-5 dead pixels before a return is accepted.
Can I return a monitor with dead pixels?
Check your specific brand's "Dead Pixel Policy". Some require at least 3-5 bright dots to authorize a return.
How common are dead pixels?
With 4K monitors having over 8 million pixels, manufacturing defects are statistically possible but rare in premium panels.