Monitor Test: Dead Pixels, Backlight Bleed, Burn-in & Ghosting Check
Comprehensive monitor test suite: check for dead pixels, backlight bleed, IPS glow, OLED burn-in & motion ghosting. Free diagnostics for all screens.
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Free Dead Pixel Tester - Check Your Monitor for Pixel Defects
The industry-standard Dead Pixel Tester for checking monitors, laptops, smartphones, and TVs. This professional-grade tool cycles through primary colors (Red, Green, Blue) and standard backgrounds (White, Black) to detect every type of pixel defect. whether you have a stuck sub-pixel, a dead black pixel, or a "hot" white pixel, this diagnostic suite will reveal it. Essential for: • Verifying new monitors within the return window • Checking used electronics before purchase • documenting defects for warranty claims (ISO 13406-2 standard) • Diagnosing "stuck" pixels that might be fixable
🔴 What are Dead Pixels vs Stuck Pixels?
Dead Pixels
Dead pixels are pixels that don't light up at all - they appear as permanent black dots regardless of what color should be displayed. Dead pixels are caused by manufacturing defects or physical damage to the display panel and cannot be fixed.
Stuck Pixels
Stuck pixels are pixels that are stuck on a specific color (usually red, green, or blue) and don't change. Unlike dead pixels, stuck pixels may sometimes be fixed using pixel repair techniques, though results vary.
🎨 Pattern Modes Explained
Color Cycle Mode
Automatically cycles through red, green, blue, white, and black. This is the most comprehensive mode for general testing.
Checkerboard Pattern
Alternating squares help identify stuck pixels more easily by providing high contrast.
Stripes & Dots Patterns
Horizontal stripes, vertical stripes, and dots patterns help with precise pixel location and defect identification.
🔗 Related Display Tests
More Screen Tests
Single-color pixel tests
Use solid color screens to quickly find dead pixels, stuck pixels, and backlight issues.
Advanced Tests
Gaming & OLED diagnostics
Test for OLED burn-in, image retention, and monitor response time for gaming.
The industry-standard Dead Pixel Tester for checking monitors, laptops, smartphones, and TVs. This professional-grade tool cycles through primary colors (Red, Green, Blue) and standard backgrounds (White, Black) to detect every type of pixel defect. whether you have a stuck sub-pixel, a dead black pixel, or a "hot" white pixel, this diagnostic suite will reveal it. Essential for: • Verifying new monitors within the return window • Checking used electronics before purchase • documenting defects for warranty claims (ISO 13406-2 standard) • Diagnosing "stuck" pixels that might be fixable
How to Use Color Palette & Display Tester
Step 1: Preparation
Clean your screen thoroughly. Dust specs can look exactly like dead pixels. Use our "Screen Cleaning Mode" first to ensure the surface is spotless. Dim the lights in your room to increase contrast.
Step 2: The White Screen Test
Start the test. The first screen is White. Look for any black dots (dead pixels) or tinted spots (dirt/debris). Scan from top-left to bottom-right in a grid pattern.
Step 3: The Black Screen Test
Switch to the Black screen. Look for any bright white, red, green, or blue dots. These are "stuck" or "hot" pixels. This is also where you check for backlight bleeding (uneven light usage).
Step 4: Sub-Pixel Analysis
Cycle through Red, Green, and Blue. If a pixel is black on the Red screen but works on Green/Blue, you have a "dead red sub-pixel". This is often enough to qualify for a warranty return on premium monitors.
Step 5: Documentation
If you find a defect, press 'G' to turn on the grid. Take a photo with your phone for proof. Count the number of defects to see if you exceed the manufacturer's ISO class limit.
Calculator Features
Auto-Cycle Diagnostic
Hands-free mode cycles all 5 test formulas to reveal defects across the color spectrum.
Precision Grid Overlay
Press 'G' to overlay a coordinate grid, allowing you to pinpoint and photograph defect locations for RMA requests.
Sub-Pixel Isolation
Test individual R, G, and B channels to find subtle sub-pixel defects invisible on white screens.
Defect Type Classification
Identify if you have a dead pixel (black), stuck pixel (colored), or hot pixel (bright white).
Complete Function List
- RGB Sub-pixel verification:
- ISO 13406-2 compliance check:
- Defect coordinate mapping:
- Stuck pixel flasher compatibility:
- OLED/LCD/VA/TN support:
- Mobile-touch optimized:
- Warranty claim helper:
- Zero-install privacy:
Common Calculations & Examples
Example 1: The "Stuck" vs "Dead" Diagnosis
Problem: You see a tiny annoying dot on your screen. Is it broken forever?
Steps:
- Run the Dead Pixel Tester
- If the dot is BLACK on all backgrounds, it is DEAD (transistor failed).
- If the dot is RED on a white background, it is STUCK (red sub-pixel locked on).
- If the dot is WHITE on a black background, it is HOT.
Explanation: Stuck pixels can sometimes be massaged out or flashed back to life. Dead pixels are permanent hardware failures. Knowing the difference saves you time.