How to Test for Dead Pixels
Quick Guide
Testing takes 2-5 minutes: 1) Open ourDead Pixel Test. 2) Enter full-screen mode. 3) Cycle through white, black, red, green, blue. 4) Look for pixels that don't change — black dots are dead, colored dots are stuck.
Step-by-Step Testing Process
Step 1: Prepare Your Screen
- • Clean the screen with a microfiber cloth to remove dust
- • Dim the room lighting (dark or dimly lit is best)
- • Set screen brightness to 70-80% (not max, reduces eye strain)
- • Close other applications to avoid distractions
- • Allow screen to warm up for 10+ minutes if just turned on
Step 2: Open the Test Tool
Navigate to one of our testing tools:
Step 3: Enter Full-Screen Mode
- • Click the "Enter Full Screen" button
- • Or press F11 on most browsers
- • This removes browser UI for unobstructed view
- • Full-screen ensures you can see edge pixels
Step 4: Test Each Color
Cycle through these test colors, spending 30-60 seconds on each:
- • White: Black dots = dead pixels
- • Black: Colored dots = stuck pixels
- • Red/Green/Blue: Confirm pixel type and find stuck sub-pixels
Step 5: Inspect Carefully
- • Move your face close to the screen (15-30 cm)
- • Scan systematically: left to right, top to bottom
- • Divide screen into sections to avoid missing areas
- • Check edges and corners carefully (common defect locations)
- • Use a magnifying glass for very small screens or fine pixels
Step 6: Document Findings
- • Take photos of any defects (for warranty claims)
- • Mark pixel locations with tape on screen bezel
- • Note: dead (black) vs stuck (colored)
- • Record screen model, purchase date, and defect count
Tip: Press Esc to exit full-screen mode at any time.
Testing Methods
Online Dead Pixel Test
Open Dead Pixel Test →Browser-based testing tool — no download required
Quick testing, all devices
2-5 minutes
High
- 1. Open Dead Pixel Test page
- 2. Click "Enter Full Screen"
- 3. Cycle through test colors
- 4. Visually inspect for defects
- 5. Exit and repeat for stuck pixels
Stuck Pixel Test
Open Stuck Pixel Test →Rapid color cycling to identify stuck sub-pixels
Detecting colored stuck pixels
2-5 minutes
High
- 1. Open Stuck Pixel Test page
- 2. Start color cycling mode
- 3. Look for pixels that don't change
- 4. Note location and color of stuck pixels
- 5. Optional: run fixing cycle
LCD Test (Multiple Modes)
Open LCD Test →Comprehensive test with multiple patterns
Full display diagnostics
5-10 minutes
Very High
- 1. Open LCD Test page
- 2. Test each color mode separately
- 3. Check solid colors: R, G, B, W, Black
- 4. Test gradient patterns
- 5. Inspect for dead/stuck pixels and other defects
Screen Test Guide
Open Screen Test Guide →Complete screen testing methodology
Learning testing best practices
10-15 minutes
Very High
- 1. Read screen test methodology
- 2. Understand different defect types
- 3. Learn optimal testing conditions
- 4. Follow step-by-step inspection
- 5. Document findings
What to Look For
Dead Pixels
- • Appear as black dots
- • Visible on all background colors
- • Most visible on white background
- • Permanently off — cannot be fixed
- • Caused by transistor failure
Stuck Pixels
- • Appear as colored dots (R/G/B)
- • Visible on some background colors
- • Most visible on black background
- • May be fixable (30-60% success)
- • Caused by stuck sub-pixel
Tips for Accurate Testing
Do
- ✓ Test in a dark or dimly lit room
- ✓ Let screen warm up 10+ minutes
- ✓ Test all colors systematically
- ✓ Get close to screen for inspection
- ✓ Test new screens immediately
- ✓ Take photos of defects found
Don't
- ❌ Test in bright sunlight
- ❌ Rush through color cycles
- ❌ Use max brightness (eye strain)
- ❌ Skip screen edges
- ❌ Ignore return windows for new screens
- ❌ Press on screen during test
Frequently Asked Questions
How long does a dead pixel test take?+
A basic dead pixel test takes 2-5 minutes to cycle through all primary colors (white, black, red, green, blue). For thorough testing, spend 30-60 seconds on each color and check all areas of the screen. A complete inspection with all test modes takes about 10 minutes.
Do I need to test my new monitor?+
Yes, test any new monitor immediately upon receipt. Most retailers have 14-30 day return windows, and any pixel defect is grounds for return. Testing early ensures you can exchange or return defective screens before the return period expires.
Can I test my TV for dead pixels?+
Yes, you can test any display with a web browser. For TVs, open the test page on your TV's built-in browser, or connect a laptop/computer via HDMI and test through that. The same color cycling method works for all screen types.
What color background shows dead pixels best?+
White backgrounds show dead pixels most clearly — they appear as black dots against white. Stuck pixels show best on black backgrounds — they appear as colored dots (red, green, or blue). Test with multiple colors for complete detection.
Should I test in a dark or bright room?+
Test in a dimly lit or dark room. Bright ambient light can make it harder to see small pixel defects. Reduce screen brightness slightly (not max) to avoid eye strain during extended testing, but keep it high enough to see color clearly.
What if I find dead pixels during testing?+
If the screen is new (within return window), return or exchange it immediately — this is your best option. If under warranty, document the pixels with photos and contact manufacturer support. Out of warranty, you'll need professional screen replacement or learn to live with it.
Test Your Screen Now
Takes only 2-5 minutes to check for dead pixels.