Black Screen Test - Professional Display Testing
Need to test your display for defects or performance issues? Our professional black screen test helps you thoroughly inspect monitors, TVs, laptops, phones, and tablets for common display problems โ completely free, no download required.
๐ฏ Start Your Display Test Now
Professional-grade testing tool โข No download โข Works on all devices
โ Launch Black Screen Test Toolโ Test dead pixels โข โ Check backlight bleed โข โ Detect OLED burn-in
โ Verify color accuracy โข โ Download test images in 4K
Why Test Your Display?
๐ฅ๏ธ Testing New Monitors/TVs
Test within the return window (14-30 days) to catch manufacturing defects like dead pixels, backlight bleed, or poor uniformity before it's too late.
๐ฑ Buying Used Devices
Verify the display quality before purchase. Check for hidden defects, screen burn-in, or damage that sellers might not disclose.
๐ฎ Gaming Monitor QA
Ensure your expensive gaming monitor has no dead pixels, proper black levels, and uniform brightness for the best gaming experience.
๐ง Professional Use
Retailers, refurbishers, and IT departments use our tool for consistent QA testing of displays before sale or deployment.
Complete Display Testing Suite
โญ Test 1: Dead Pixel Detection (Most Important)
Time: 3-5 minutes
Dead pixels are permanently damaged pixels that appear as black dots on white backgrounds or colored dots on black backgrounds.
How to test:
- Use our white screen โ Scan for tiny black dots
- Switch to black screen โ Look for colored/bright pixels
- Test with red, green, blue screens โ Find stuck sub-pixels
Acceptable: 0 pixels (perfect), 1-3 pixels (manufacturer tolerance), 4+ pixels (demand replacement)
Test 2: Backlight Bleed Testing
Time: 3 minutes
Light "leaking" around LCD panel edges, making blacks appear gray or glowing โ especially visible in dark rooms.
How to test:
- Use our pure black screen in fullscreen
- Turn room lights completely OFF
- Set screen brightness to 100%
- Look for glowing areas in corners and edges
Note: Some backlight bleed is normal on LCD/LED panels. OLED displays should have ZERO bleed.
Test 3: Screen Uniformity
Time: 5 minutes
Uneven color or brightness distribution across the screen โ causes "dirty screen effect" on spreadsheets and documents.
How to test:
- Display 50% gray (custom color RGB 128,128,128)
- Look for lighter or darker patches
- Test with pure red, green, blue screens
- Check for color tinting in different areas
Test 4: OLED Burn-In Detection
Time: 2 minutes
For OLED displays only (iPhone 12+, Samsung Galaxy, OLED monitors/TVs) โ permanent ghosting of static UI elements.
How to test:
- Use our pure white screen at 80% brightness
- Look for faint outlines of app icons, status bars, or navigation buttons
- Check for news ticker remnants (common on TVs)
Prevention: Use our OLED protection mode during long sessions to prevent burn-in.
Test 5: Color Accuracy Check
Time: 3 minutes
Basic check to ensure colors appear vibrant and true โ important for photo/video editing.
How to test:
- Display pure red, green, blue screens
- Verify colors appear vibrant (not washed out or tinted)
- Test white screen (should be neutral, not yellow/blue)
- Test black screen (should be true black, not gray)
Ready to Test Your Display?
Our free tool provides all the test patterns you need in one place:
Launch Testing Tool โNo download โข No registration โข Works on all devices โข 100% free
Professional Testing Tips
๐ฏ Best Testing Practices
- Clean your screen first โ Dust and smudges can look like dead pixels
- Test in different lighting โ Some defects only show in bright/dark rooms
- Take photos/videos โ Document defects for warranty claims
- Test immediately after purchase โ Most return windows are 14-30 days
- Compare with other displays โ Helps identify if an issue is normal or defective
- Use fullscreen mode โ Essential for accurate testing (press F11 or F)
๐ Warranty & Return Guidelines
- Dead pixels: Most manufacturers allow 0-5 dead pixels before replacement
- Backlight bleed: Severe cases are usually grounds for return
- Screen uniformity: Significant "dirty screen effect" may qualify for return
- OLED burn-in: Usually not covered by warranty (considered wear-and-tear)
- Document everything: Take clear photos/videos of defects for warranty claims
Frequently Asked Questions
How many dead pixels are acceptable?
It depends on the manufacturer's policy. Most consider 0-3 dead pixels "within specification" for consumer displays. Premium/professional monitors often have stricter standards (0-1 pixels). Always check the return policy before purchase.
Can stuck pixels be fixed?
Sometimes! Try our rapid color cycling feature (cycle through all colors at 1-second intervals for 30+ minutes). This forces the pixel through rapid state changes and can sometimes "unstick" it. Dead pixels (completely black) cannot be fixed.
Is backlight bleed normal?
Some backlight bleed is normal on LCD/LED panels, especially IPS displays. Minimal bleed visible only in dark rooms is acceptable. Severe bleed visible in normal lighting is a defect. OLED displays should have ZERO backlight bleed.
How do I prevent OLED burn-in?
Use our OLED protection mode during long sessions, enable auto-brightness, hide static UI elements when possible, and use screen savers. Avoid displaying static images (logos, status bars) at high brightness for extended periods.
Do I need to download anything?
No! Our testing tool is 100% web-based. Just visit our site, select your test screen (white, black, colors), enter fullscreen, and start testing. Works on any device with a web browser.
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Read the guide โStart Testing Your Display Now
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Monitors, TVs, phones, tablets
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All features, forever free
Last Updated: October 2025 | Tested On: All major browsers and devices
