Mobile Screen Test Guide
Turn off auto-brightness, set max brightness, then run dead pixel and touch tests in fullscreen. OLED phones need a black-screen stuck pixel check and burn-in pass.
Start with essentials
Mobile OLED defects are obvious on pure black but invisible on wallpapers. Touch dead zones and burn-in only show up with structured tests.
Carrier and marketplace returns are tight. Run pixel and touch tests before removing screen film or activating accounts.
OLED: any bright pixel on black is visible. LCD: corner glow is more common than true bleed. Match tests to your panel type.
Burn-in, touch damage, and brightness fade only appear under stress tests. Ten minutes of checks beats a costly surprise.
Five steps in priority order. Repeat dead pixel test in portrait and landscape.
Tap preview for fullscreen; wait for white and black steps. Any lit pixel on black stands out on OLED.
Drag across the 10×10 grid. Red cells mark missed zones — common after drops on corners.
Run burn-in patterns, then pure black for status bar or keyboard ghosts — critical on used OLED.
Confirm DPR and viewport match model specs. Catches misrepresented or refurbished panels.
Repeat dead pixel test in both orientations. Some digitizer rows fail only in landscape.
Device pixel ratio — logical CSS pixels vs physical pixels. iPhone Retina values should match Apple specs for your model.
Temporary ghost that fades after minutes or pixel refresh — common on OLED, often not a return issue.
Pulse-width modulation dimming at low brightness. Can cause eye strain; not a defect but worth checking if sensitive.
Most flagships use OLED; budget devices often use LCD. Priorities differ.
Flagship phones
Budget phones
Adaptive refresh
Rare tablets
Thresholds for new and used mobile displays.
Marketplace policies vary. Screenshot tests at max brightness for dispute evidence.
True Tone and adaptive brightness hide tint and PWM behavior.
Screen protector bubbles mimic dead pixels on white.
Defects are hardest to see below 50% brightness.
Use native browsers for best fullscreen support on iOS and Android.
Ask seller for white and black fullscreen photos before meeting.
Run manufacturer pixel refresh after burn-in test if available.
Yes — bubbles and dust look like defects. Remove film if safe, or test before applying.
Varies by brand. Document ghosts on black immediately if found within return period.
TestMyGears covers color, greyscale, HDR, response time, and input checks in the browser. Every tool stays free to use.
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