Dead Pixel Test — 12-Color Fullscreen Check
Professional Pixel Inspection
A professional dead pixel test: cycle 12 full-screen solid colors to expose every bright, dead and stuck pixel. The very first check to run inside your 7-day return window.
12-Color Cycle
White/black/RGB/CMY/orange plus three gray levels — covers every defect scenario.
Grid Overlay
Optional 48px positioning grid to log defect coordinates for return claims.
Custom Color
Enter any HEX value for a fullscreen fill to hunt gamut-specific anomalies.
What Are Bright, Dead & Stuck Pixels?
Bright Pixel
A pixel stuck on (white/red/green/blue) visible against black — the most glaring and least tolerated defect.
Dead Pixel
A pixel that never lights up, seen as a black dot on white. Verify per color and wipe first to rule out dust.
Stuck-on-Color
A pixel that only fails on certain colors — usually manufacturing damage, pressure, static or aging.
Three Steps to Find Dead Pixels
Go Fullscreen
Click the stage or press F. A solid color fills the entire screen with zero distraction.
Cycle Colors
Use ← → or swipe: find bright pixels on black, dead pixels on white, stuck pixels on colors.
Judge by Standard
ISO 13406-2 Class II allows 2 bright + 2 dead pixels per million; ≥1 bright pixel usually justifies a return.
Pixel Policy by Brand
ISO 13406-2
Class II- · 2 bright px / million
- · 2 dead px / million
- · 5 stuck px
- · Industry baseline
Apple
Zero Tolerance- · No public numeric spec
- · Near-zero in practice
- · 14-day no-question return
- · Genius Bar visual check
Dell Premium
Zero Bright- · No bright pixels guaranteed
- · Dead px numeric limits
- · Free panel exchange
- · Within warranty
CN Retail
7-Day Return- · No-question returns in 7 days
- · Defects = quality claim
- · Test on arrival
- · Keep photo evidence
Pro Tips
Test in the Dark
Dim the room and set brightness above 70% — faint bright pixels pop against black in the dark.
Wipe Before You Judge
Rub suspected dead pixels with a microfiber cloth first to rule out dust and fingerprints.
Document Everything
Enable the grid overlay and photograph defects with coordinates — strong evidence for returns.
Test on Arrival
The 7-day return clock starts at delivery. Run dead pixel + bleed tests first thing after unboxing.
FAQ
Recommended Test Environment
- Dark or dim room — avoid glare on the panel
- Screen brightness at 70%–100%
- Disable night mode / blue-light filters
- Viewing distance 50–70cm, scan zone by zone
- Let the panel warm up for 5 minutes
- Keep a microfiber cloth handy for dust