OnlineScreenTesterPro
Pixel Audit

Dead Pixel Hunter

Cycle through primary colors (Red, Green, Blue, White, Black, Magenta, Cyan, Yellow) to expose defective or dead subpixels before your retailer return window expires.

Display Active

Automated Color Cycling Stage

Colors cycle automatically every 2 seconds. Press 'Space' to advance manually, or 'F' to go fullscreen.

💡Softbox Light
Click to Enter Distraction-Free Fullscreen
Auto-hides in 3s · Tap to cycle colors
Canvas:#FFFFFF
Mode:Solid Color
Manufacturer Warranty Standard

ISO 9241-307 Pixel Defect Warranty Calculator

Monitor manufacturers (Dell, LG, Asus, Samsung, Acer) define return eligibility based on ISO 9241-307 defect allowances per million pixels.

Presets:
Total Screen Pixels:8,294,400 (8.29 MP)
ISO Class RatingType 1: Hot Pixels (Always White)Type 2: Dead Pixels (Always Black)Type 3: Stuck Subpixels (RGB)Market Standard
Class 0 (Zero Tolerance)0 Pixels0 Pixels0 PixelsMedical, Military & Apple Studio Display (Bright Dots)
Class 1 (Premium Studio)~8 Pixels~8 Pixels~17 SubpixelsDell UltraSharp Premium Panel Guarantee, Asus ProArt
Class 2 (Standard Commercial)~17 Pixels~17 Pixels~41 Subpixels95% of All Consumer Monitors & Laptops
Class 3 (Budget Grade)~41 Pixels~124 Pixels~415 SubpixelsCheap OEM TV panels, budget kiosks

Need to return or RMA a brand new monitor?

If you find dead pixels within the 14-30 day retailer return window (Amazon, Best Buy, B&H), return it for a direct replacement immediately rather than filing a manufacturer warranty claim.

Run Dead Pixel Screen Test

Inspection Instructions:

  1. Wipe your display with a microfiber cloth to prevent confusing surface dust with pixel defects.
  2. Click into fullscreen mode (F key).
  3. Scan your eyes systematically across the grid: top-left to top-right, middle, and bottom.
  4. Look for any persistent dark dots on colored backgrounds (indicating dead subpixels) or persistent colored dots on dark backgrounds (indicating stuck subpixels).
  5. If a stuck pixel is found, launch the Stuck Pixel Doctor to attempt resuscitation.