Foldable Phone Dead Pixel & Crease Test Guide

By Cedrick Reese · Updated August 2026

This is a dead pixel and crease test built specifically for foldable phones. If you've just unfolded a brand-new Galaxy Z Fold, Pixel Fold, or similar device, it's worth checking the display carefully before your return window closes, and checking it differently than you would a regular phone or monitor. The crease and hinge area flexes every time you open and close the phone, and that's exactly where owners report the most defects.

Why the crease is different from a flat screen

A foldable's inner display is a flexible OLED panel that physically bends along the crease thousands of times over the phone's life. That mechanical stress is concentrated in a narrow band down the middle of the screen, which is why defects like dead pixels, stuck pixels, and pressure marks tend to cluster there rather than being evenly spread across the panel.

Dead pixel vs. stuck pixel vs. crease shadow

Before you worry about what you're seeing, make sure you're looking at an actual pixel defect and not something else:

• Dead pixel: stays completely black on every color you test. Permanent, not fixable by software.
• Stuck pixel: stays lit on one color (usually red, green, or blue) no matter what the rest of the screen is showing. Sometimes responds to a repair/agitation tool.
• Crease shadow or light reflection: a visual artifact from the crease itself catching light at certain angles. This isn't a pixel defect. Tilt the phone slightly and it should change or disappear. A genuine dead or stuck pixel stays exactly where it is regardless of angle.

Step-by-step: testing both displays

1. Clean both the inner and outer displays with a soft microfiber cloth first, since dust is easy to mistake for a defect.
2. Open our Dead Pixel Test tool on the inner (unfolded) display and cycle through white, black, red, green, and blue.
3. Run our Touch Screen Test on the inner display too, since a crease-area pixel defect and a touch dead zone are different problems that can both hide in the same spot.
4. Pay close attention to the crease band specifically, not just the edges. Move slowly and look straight down the middle of the screen at each color.
5. Close the phone and repeat the same test on the outer cover display. It's a separate panel, so a clean inner display doesn't tell you anything about the outer one.
6. If you find a colored (stuck) pixel near the crease, note it. The repair mode on the same tool is worth trying, though it isn't guaranteed to work near the crease any more than anywhere else.

What's normal wear vs. a warranty issue

A visible crease line itself is normal on nearly every current foldable and isn't a defect on its own. What's worth acting on is an actual dead or stuck pixel, a lifting screen protector, or new cracking sounds from the hinge. See our broader new monitor defect checklist for how return windows and defect thresholds generally work, since the same return-window urgency applies to phones as it does to monitors.

Do this in your return window, not months later

Retailer return windows for a defective device are often much shorter than the manufacturer's full warranty period, so test as soon as the phone arrives rather than after you've been using it for a few weeks. A foldable that develops a pixel defect after 30–60 days may still be covered by warranty, but the easy no-questions return window will likely already be closed.

Frequently asked questions

Open the Dead Pixel Test tool →

Not sure this is your actual problem? Start with the full screen defect triage guide →

The crease-specific steps here come from handling foldable phones directly, since the crease behaves differently from a flat panel under a dead-pixel test and most generic guides skip that entirely. The sequence is checked against current-generation foldable displays and updated as new models change how the crease area behaves.