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Dead Pixel Test: Inspect Your Display for Dead & Stuck Pixels

Check monitors, laptops, and TV screens for dead, stuck, and hot pixels using full-screen solid primary color cycles.

Quick Answer:Click 'Start Fullscreen Test' to enter full screen. Inspect your display closely. Press the Spacebar or Arrow keys to cycle through pure colors to identify defective subpixels.

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How to Use the Dead Pixel Test: Check Screen for Stuck & Dead Pixels

1Clean your monitor screen with a soft, dry microfiber cloth to remove surface dust particles.
2Click 'Start Fullscreen Test' to expand solid color testing across your entire display.
3Press the Spacebar, Arrow keys, or click the screen to cycle through Black, White, Red, Green, and Blue.
4Examine the screen closely for tiny dots that remain permanently dark or mismatched in color.

Formula & How It Works

Full-Screen Primary Color Subpixel Isolation

Solid Color Hex Values: Black (#000000), White (#FFFFFF), Red (#FF0000), Green (#00FF00), Blue (#0000FF)

Activates individual RGB subpixel channels to isolate transistor failures. Source: ISO 13406-2 / ISO 9241-307 Display Quality Standards.

Worked Examples

Detecting Stuck Hot Pixels on Black Screen

Input: Testing full-screen Pure Black (#000000)

Explanation: Indicates a stuck green subpixel transistor that is continuously powered on.

Result: A tiny bright green dot visible against the black background

Detecting Dead Pixels on White Screen

Input: Testing full-screen Pure White (#FFFFFF)

Explanation: Indicates a dead pixel where all three RGB subpixels have failed to receive current.

Result: A persistent black speck that fails to illuminate

Testing Backlight Bleed on Edge-lit Monitors

Input: Testing Pure Black in a dark room

Explanation: Reveals IPS/VA panel backlight leakage rather than individual pixel defects.

Result: Uneven yellowish or white glow creeping from monitor corners

Frequently Asked Questions

What is the difference between a dead pixel and a stuck pixel?▼

A dead pixel is completely unpowered and remains black across all bright colors. A stuck pixel has one subpixel (red, green, or blue) permanently switched on, showing up brightly on dark backgrounds.

Can stuck pixels be fixed?▼

Stuck pixels can sometimes be revived by displaying rapid color cycling patterns (pixel flasher software) or through gentle thermal cycling. Dead pixels with broken transistors cannot be repaired.

How do I exit the fullscreen test mode?▼

Press the 'Esc' key on your keyboard or click the 'Exit Test' button in the top right corner of the screen.

Does this dead pixel test work on smartphones and tablets?▼

Yes, it runs seamlessly on iOS and Android browsers. Simply tap the screen to cycle colors.

How many dead pixels are allowed under manufacturer warranty?▼

Most consumer monitors fall under ISO 9241-307 Class II, which allows up to 2 dead pixels or 5 stuck subpixels per million pixels before qualifying for free warranty replacement.

Does this test cause any screen burn-in?▼

No. Displaying solid colors for a few minutes does not cause burn-in. Simply exit fullscreen mode when you finish your inspection.

Quick Reference & Conversion Table

Test Background	Subpixel Activated	Defect Revealed
Pure Black	All subpixels OFF	Stuck hot pixels (glowing red, green, or blue dots)
Pure White	Red + Green + Blue ON	Completely dead pixels (permanent black dots)
Pure Red	Red subpixels ON	Faulty red subpixels (appear dark or discolored)
Pure Green	Green subpixels ON	Faulty green subpixels (human eye is most sensitive to green)
Pure Blue	Blue subpixels ON	Faulty blue subpixels and color uniformity shifts

⚠️ Common Pitfalls to Avoid

•Mistaking surface dust or spit specks on the glass for dead pixels; always clean your screen first.
•Pressing hard on your monitor screen with fingers, which can permanently damage fragile LCD liquid crystals.
•Testing in a room with harsh window glare, making subtle subpixel defects difficult to notice.

💡 Practical Real-World Uses

•Inspecting newly purchased monitors or laptops during the store return/exchange window.
•Verifying pixel defect warranty thresholds under ISO 9241-307 Class I/II monitor policies.
•Checking refurbished TVs and second-hand smartphone screens prior to purchase.

Last reviewed & updated: 2026-11-07

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