Why dead pixels matter on a large phone
Large phones make central pixel defects easier to notice during browsing, reading, and video playback. On a premium used device, buyers usually expect the panel to be clean.
A dead pixel may be invisible on a wallpaper or app grid but stand out immediately on plain backgrounds.
Best way to confirm a defect
Use white for dark dead pixels, then red, green, and blue to see whether one subpixel channel is weak or stuck. Black can reveal bright stuck pixels clearly.
Clean the glass first and check from normal viewing distance before moving closer.
How much the result should affect the deal
An edge defect may be less serious, but central dead pixels should lower the offer significantly. On a Pro Max model, display quality is a major part of the device value.
If you notice the defect easily in normal use, it should matter in the purchase decision.
FAQ
Should I test a used iPhone Pro Max for dead pixels before buying?
Yes. It is one of the fastest ways to verify screen quality on a premium used phone.
Which screen reveals dark dead pixels best?
White is usually the best first screen, followed by the primary colors for confirmation.
Do central pixel defects matter more than edge ones?
Yes. Central defects are usually much more distracting in daily use.
Run the test now
Use the OLED Test homepage to open fullscreen colors, inspect uniformity, and compare panel behavior in real time. The browser-based workflow is fast, free, and works well for quick repeat checks.