Phone screen test
A short visual workflow for checking a phone screen before a return window closes or after a display symptom appears.
Check the panel at your normal settings
These are observations to repeat, not automatic diagnoses.
- 01
Clean the glass and remove reflections. Use your usual brightness; note whether automatic brightness or a night filter changes what you see.
- 02
Run the dead-pixel test across white and RGB colors. Keep the same physical point in view.
- 03
For an OLED phone, use the image-retention test after varied normal content. A fixed image cannot establish permanent burn-in in one session.
- 04
Lines, flicker, pressure marks, or touch failures that stay during normal phone use may need model-specific support. A browser cannot diagnose the display hardware.
Check for a line or fixed point safely
Use the phone’s own browser to compare solid colors. If a line follows a drop, liquid exposure, swelling, unusual heat, or spreading damage, stop testing and contact the manufacturer. A screenshot can help distinguish a rendered-image issue from a mark visible only on the phone, but it cannot diagnose a panel.
Choose a visual test
Use another camera if you need to document a physical mark; a screenshot records the image signal rather than the panel. For a problem that continues during normal viewing, contact the seller or manufacturer.
These checks have been simulated at phone and tablet viewport sizes, but ScreenCheckup has not been physically tested on every phone, laptop, or television/browser combination.