Dead Pixel Test

Inspect solid colors and document pixels that appear dark, bright, or fixed.

This check opens a focused test surface. You can return with Escape. Review what this browser test can and cannot measure.

Before you start

  • Clean the screen so dust is not mistaken for a pixel issue.
  • Use your normal viewing distance and dim distracting room reflections.

How to run this check

  1. Open the Dead Pixel Test
  2. Click "Start Test" to enter fullscreen mode
  3. Press Space or click to cycle through 8 solid colors (White, Black, Red, Green, Blue, Cyan, Magenta, Yellow)
  4. Look carefully at each color and mark any pixel that does not match its surroundings
  5. Press ESC to exit, then record the location and colors on which each suspect pixel remained visible

What this browser test can tell you

Can help you check

  • Visual inspection and user-marked suspect pixels.

Cannot measure

  • This test cannot automatically classify pixels or determine warranty eligibility.
Setup, interpretation, and sources

Recommended setup

  1. Clean the screen, use its native resolution, and inspect from a comfortable distance.
  2. Check every solid-color pattern and mark each suspect location.

How to interpret what you see

  • Record the location and colors on which each suspect pixel stays dark, bright, or fixed.
  • Exact pixel classification requires magnification and calibrated camera or microscope inspection.

Sources

Methodology reviewed:

💡 Why This Test?

Suspect pixels may appear dark, bright, or fixed on one color while you cycle through solid backgrounds.

This test supports careful visual inspection and location notes. It cannot automatically classify the pixel hardware, determine permanence, or decide whether a support policy applies.

✅ What You'll Check:

  • Pixels that remain dark on several backgrounds
  • Pixels that remain one color while backgrounds change
  • Pixels that remain unusually bright
  • The location and color patterns for each observation

📖 How to Use This Test

  1. Click "Start Test" to enter fullscreen mode
  2. Use the color buttons or arrow keys to cycle through different colors
  3. Look carefully at your entire screen for any spots that don't match the background color
  4. Try all colors - dead/stuck pixels are easiest to spot on contrasting backgrounds
  5. Press ESC or click the ✕ button to exit and record your results

💡 Tip: For best results, clean your screen first and view in a dark room to spot subtle defects.

Click to start the test in fullscreen. Use color buttons or arrow keys to cycle through colors. Press ESC to exit.

👁️ What You're Looking For

No Obvious Issue Noted

Solid Red Reference

No mismatch is visible in this illustrated sample

❌ Dead Pixel Example

Red Background

Black spots that stay black on colored backgrounds

⚠️ Stuck Pixel Example

Blue Background

Colored spots that don't change with background

📋 How to Test

1

Start Fullscreen Test

Click the test button and allow fullscreen mode for best results.

2

Check Each Color

Cycle through all 8 colors: white, black, red, green, blue, yellow, magenta, cyan.

3

Look Carefully

Scan the entire screen systematically. Dead pixels are easier to spot on contrasting colors.

4

Navigate

Use arrow keys, click color swatches, or use navigation buttons. Press ESC to exit.

🔍 Quick Reference

  • ● Dark observation: Remains dark on several patterns
  • ● Fixed-color observation: Appears unchanged as backgrounds change
  • ● Bright observation: Remains unusually bright
  • ● Normal: Changes with background

🔧 Common Issues & Solutions

❓ I found 1-2 dead pixels. Is this normal?

Record each location and the solid colors on which it remains visible, then repeat the observation after cleaning the screen and confirming native resolution.

Pixel policies vary by product, region, seller, defect type, and location. Compare your notes and photos with the current policy for the exact model; this page cannot determine eligibility.

❓ Can stuck pixels be fixed?

A browser observation cannot diagnose the electrical cause or predict whether a suspect pixel will change.

Try these methods:

  • Recheck the location on every solid color and in ordinary content.
  • Use only manufacturer-approved pixel-care or panel-maintenance features.
  • Avoid pressing, rubbing, or heating the panel, which can cause damage.

Keep the original observation and any follow-up result as documentation.

❓ What's the difference between dead and stuck pixels?

Type Appearance What to record
Dead Pixel Appears dark across backgrounds Location and every pattern checked
Stuck Pixel Appears fixed on one color Color and backgrounds where visible
Hot Pixel Appears unusually bright Location, brightness, and patterns checked

❓ When should I request warranty replacement?

Prepare useful documentation:

  • Record the number and approximate location of suspect pixels.
  • List the backgrounds on which each observation remains visible.
  • Take a focused photo that also shows enough of the screen to locate it.
  • Check the current support terms for the exact product and region.

💡 Pro Tips:

  • Take clear photos showing defects (use macro mode, white background)
  • Note exact pixel locations (measure from edges in cm)
  • Check manufacturer's specific dead pixel policy before purchase
  • Ask the manufacturer or retailer to interpret its own current policy

❓ The test colors look wrong or won't fullscreen

Troubleshooting steps:

  • Fullscreen not working: Press F11 or click fullscreen button in browser. Some browsers block auto-fullscreen.
  • Colors look washed out: Disable Night Light/f.lux/blue light filter temporarily. Check monitor color mode (sRGB recommended).
  • Screen too bright/dark: Adjust monitor brightness to 50-80%. Test in dim room for best dead pixel visibility.
  • Can't see small pixels: Normal on 4K+ displays. Get closer (30cm) or use magnifying glass for tiny defects.