Black Screen Test
Dead Pixel Test & Monitor Checker
Free dead pixel test and black screen checker for laptop, desktop monitor, smartphone, tablet. Detect stuck pixels, backlight bleeding, OLED burn-in instantly. No download required.
Professional Monitor Testing Suite
Complete color testing for photography, gaming, video editing, and graphic design. Test RGB accuracy, dead pixels, and display uniformity. Perfect for creative professionals and gamers.
Professional Display Testing Service
Advanced display analysis platform providing enterprise-grade testing accuracy for professionals, businesses, and quality-conscious consumers worldwide.
Scientific Precision
ISO-compliant testing protocols with pixel-level accuracy and professional validation standards
Instant Analysis
Real-time processing with hardware acceleration for immediate professional-grade results
Enterprise Ready
Trusted by quality assurance teams, technology reviewers, and professional organizations
Comprehensive Display Analysis Capabilities
Professional-grade testing suite covering all critical display defects and quality parameters. Our advanced algorithms provide accurate detection across all modern display technologies.
Dead Pixel Detection
Find dead pixels, stuck pixels, and bright pixels instantly. Dead pixels appear black while stuck pixels stay one color (red, green, blue).
Backlight Bleed Test
Detect LCD backlight bleeding and screen uniformity issues. Most visible during black screen test in dark room conditions.
Display Uniformity Check
Test color accuracy, brightness uniformity, and display calibration across LCD, OLED, and LED monitor types.
OLED Burn-in Test
Check for OLED burn-in, image retention, and ghosting effects. Essential for AMOLED smartphone and OLED TV testing.
Color Accuracy Test
Test RGB color accuracy, gamma correction, and detect color shifting or tinting issues across different display technologies
Gradient Banding Test
Check smooth color transitions and detect color banding, posterization effects, and gradient uniformity issues
How to Test Your Monitor for Dead Pixels
Step-by-step guide to test your laptop screen, computer monitor, phone display, or tablet for dead pixels and display issues.
Clean your monitor screen first
Remove dust, fingerprints, and smudges from your laptop screen, computer monitor, or mobile device display
Choose black screen test or color test
Black screen reveals dead pixels and backlight bleeding. White screen shows stuck pixels. Color tests check RGB subpixels
Click to start fullscreen test
Automatically enters fullscreen mode for accurate pixel testing. Works on Windows, Mac, Linux, Android, and iOS devices
Look for display defects
Check for dead pixels (black dots), stuck pixels (colored dots), backlight bleeding, and screen uniformity issues
Exit fullscreen test mode
Press ESC key, click anywhere, or tap screen to exit. Use keyboard shortcuts 1-9 to switch between color tests quickly
💡Monitor Testing Pro Tips
Black screen test works best in dark environment to detect LCD backlight bleeding and monitor uniformity problems
Pure white screen test reveals dead pixels as black spots and helps identify stuck pixels on any display type
OLED black screen test saves up to 58% battery power while checking for burn-in and image retention issues
Full color screen tests (red, green, blue, yellow) verify RGB subpixel accuracy and color calibration
Always test new monitors within 30 days for warranty claims and return policies. Essential for used monitor purchases and refurbished displays
Dead Pixel Test FAQ
Frequently asked questions about black screen test, dead pixel detection, and monitor testing
🔧 Black Screen Test Basics
How does black screen test work for dead pixel detection?
Black screen test displays pure black (#000000) across your full screen to reveal display defects. Dead pixels appear as bright colored dots, stuck pixels stay lit in red/green/blue, and backlight bleeding shows as light leakage around LCD monitor edges.
Dead pixel vs stuck pixel - what's the difference?
Dead pixels are completely black and never light up (hardware failure). Stuck pixels stay lit in one color (red, green, or blue subpixel stuck on). Dead pixels need monitor replacement, stuck pixels can sometimes be fixed with pixel fixing software.
Is black screen test safe for OLED and LCD monitors?
Yes, black screen testing is 100% safe for all display types including LCD, LED, OLED, AMOLED, and plasma screens. OLED displays actually save 58% battery power during black screen test and reduce burn-in risk.
My laptop screen is completely black during test - is this normal?
Yes, pure black screen is normal during testing. Look for bright spots (dead pixels), colored dots (stuck pixels), or light bleeding around edges. A perfectly uniform black screen means your laptop display is healthy.
How often should I check my monitor for dead pixels?
Test new monitors immediately and within 30 days for warranty claims. Check gaming monitors monthly due to heavy use. Test laptop screens quarterly. Always test before warranty expires to document any pixel defects.
Can I test my phone screen for dead pixels?
Yes, our mobile-friendly black screen test works on iPhone, Android phones, tablets, and all smartphone displays. No app download required - just use your mobile browser to test for dead pixels and screen defects.
How to check OLED burn-in with black screen test?
Black screen test perfectly reveals OLED burn-in and image retention. Look for faint ghosting, persistent UI elements, or permanent shadows on the black background. OLED burn-in appears as darker or lighter areas and usually requires screen replacement.
What should I do if I find dead pixels?
If you find dead pixels on a new monitor (under 30 days), contact the manufacturer for warranty replacement. For older displays, you can try pixel fixing software or gentle pressure techniques, but hardware replacement is often the only permanent solution.
What keyboard shortcuts are available during testing?
During fullscreen testing: ESC to exit, H or Space to toggle help, numbers 1-9,0,-,= to switch between color tests (1=Black, 2=White, 3=Red, 4=Green, 5=Blue, 6=Yellow, 7=Magenta, 8=Cyan, 9=Gray, 0=Orange, -=Dark Gray, ==Purple). These shortcuts make testing faster and more efficient.
Does this work with Dell, HP, ASUS, and LG monitors?
Yes, our black screen test works perfectly with all major monitor brands including Dell UltraSharp, HP EliteDisplay, ASUS ROG gaming monitors, LG UltraWide, Samsung Odyssey, Acer Predator, and BenQ monitors. Brand-specific features like G-Sync and FreeSync don't affect dead pixel testing.
Can I test MacBook Pro, Surface, and laptop screens?
Absolutely! Test any laptop screen including MacBook Pro/Air, Microsoft Surface, ThinkPad, Dell XPS, HP Spectre, and gaming laptops. Works on both Retina displays and standard LCD laptop screens for dead pixel detection.
How to test iPhone, Samsung Galaxy, and Android phones?
Our mobile-friendly tool tests all smartphone displays: iPhone 15 Pro/Max, Samsung Galaxy S24/Note, Google Pixel, OnePlus, Xiaomi, and any Android device. Just open in your mobile browser - no app download needed.
💰 Warranty & Buying Guide
Should I test before buying a monitor or laptop?
Yes! Always test monitors before purchase when possible. For online purchases, test immediately upon delivery within the return window. Many retailers offer 30-day returns for dead pixel issues. Document any defects with photos for warranty claims.
What's the dead pixel warranty policy for major brands?
Most brands like Dell, HP, LG, ASUS offer different policies: Premium monitors often have 0-dead-pixel guarantee, standard monitors typically cover 3+ dead pixels, budget displays may require 5+ defective pixels. Always test within 30 days and check your specific model's warranty terms.
How to test used monitors and refurbished displays?
Essential for used monitor purchases! Run comprehensive black/white/color tests, check for burn-in on OLED displays, test all ports and features. Used gaming monitors need extra scrutiny for pixel damage from heavy use. Save test screenshots for documentation.
Is this suitable for photography, gaming, and video editing monitors?
Absolutely! Professional photographers use our tool for color-critical monitor testing, gamers verify high-refresh gaming monitors for pixel defects, and video editors check color accuracy on editing displays. Essential for creative professionals requiring perfect display quality.
How to test monitors for graphic design and CAD work?
Our precision dead pixel test is perfect for graphic design monitors, CAD workstations, and professional displays. Test color accuracy with RGB tests, check uniformity for design work, and verify display quality for technical drawings and detailed visual work.
Service Standards & Quality Assurance
Our professional display testing service maintains the highest standards of accuracy, reliability, and user experience across all supported platforms.
Testing Accuracy Standards
Pixel-Level Precision
Individual pixel analysis with sub-pixel accuracy for comprehensive defect detection
Color Space Compliance
sRGB, Adobe RGB, and DCI-P3 color space validation with professional accuracy
Uniformity Assessment
Advanced algorithms for brightness and color uniformity across display surface
Professional Service Guarantee
Cross-Platform Consistency
Identical testing accuracy across all supported devices and operating systems
Performance Optimization
Hardware acceleration and optimized algorithms for instant professional results
Continuous Quality Monitoring
Regular validation and updates to maintain professional-grade testing standards
Compatible Devices & Browsers
Test any device screen - laptop, desktop monitor, smartphone, tablet. Works in all browsers without downloads.
Monitor Brands
- ✓ Dell UltraSharp
- ✓ LG UltraWide
- ✓ ASUS ROG
- ✓ Samsung Odyssey
Browser Support
- ✓ Chrome 90+
- ✓ Firefox 88+
- ✓ Safari 14+
- ✓ Edge 90+
Laptop Testing
- ✓ MacBook Pro/Air
- ✓ Dell XPS Series
- ✓ HP Spectre/Envy
- ✓ Surface Laptop
Phone Testing
- ✓ iPhone 15 Pro/Max
- ✓ Samsung Galaxy S24
- ✓ Google Pixel 8
- ✓ OnePlus/Xiaomi
Monitor Test Troubleshooting
Fix common issues with black screen test, fullscreen mode, and dead pixel detection
🔧 Common Issues & Solutions
💻 Browser & Technical Issues
Black screen test won't start or load
- Enable JavaScript in Chrome, Firefox, Safari, or Edge
- Disable ad blockers and browser extensions temporarily
- Try incognito/private browsing mode
- Clear browser cache and refresh the page
Stuck in black screen - can't exit fullscreen
- Press ESC key to exit black screen test
- Click or tap anywhere on the screen
- Use Alt+Tab (Windows) or Cmd+Tab (Mac) to switch windows
- Press F11 to toggle fullscreen mode on/off
🔴 Hardware Issues & Warranty
I found dead pixels on my monitor - what should I do?
- Document dead pixel locations with photos
- Check warranty status (most cover 3+ dead pixels)
- Try JScreenFix or UDPixel software first
- Contact Dell, HP, ASUS, LG support for replacement
Backlight bleeding detected on LCD monitor
- Test in completely dark room for accurate assessment
- Check if bleeding is within manufacturer specifications
- Adjust monitor stand and viewing angle
- Contact warranty support if bleeding exceeds normal limits
Professional Display Testing Service Excellence
Advanced display analysis platform trusted by professionals worldwide. Enterprise-grade accuracy with instant accessibility and comprehensive testing capabilities.
Enterprise-Grade Accuracy
Professional testing platform with scientific validation and industry-standard protocols. Delivers results comparable to dedicated hardware testing equipment.
Instant Professional Analysis
Real-time processing with advanced algorithms for immediate pixel-level defect detection and comprehensive display quality assessment.
Universal Platform Compatibility
Cross-platform professional testing service supporting all major operating systems, browsers, and device types with consistent accuracy.
Industry Professional Standards
Trusted by technology reviewers, quality assurance teams, creative professionals, and enterprise organizations for critical display validation.
Investment Protection Service
Professional display evaluation service for warranty validation, quality assurance, and informed purchasing decisions in professional and consumer markets.
Advanced Display Technology
Continuous platform updates supporting emerging display technologies, HDR standards, and professional display requirements as technology evolves.
Monitor Test Specifications
Technical specs for black screen test, dead pixel detection accuracy, and display compatibility
Monitor & Display Support
Dead Pixel Test Accuracy
Ready to Test Your Screen?
Start the professional black screen test now. Detect dead pixels, stuck pixels, and display issues in seconds.
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