Laptop screen test
Check a laptop screen with full-screen color patterns and compare any marks under normal viewing conditions.
Check the panel at your normal settings
These are observations to repeat, not automatic diagnoses.
- 01
Use the laptop at its native display setting and comfortable brightness. Avoid reflections and strong night-light filters.
- 02
Check for dark or bright points against different solid colors.
- 03
If the laptop uses an LCD, inspect black and near-black patterns from your normal seated angle for edge light.
- 04
If the laptop has OLED, look for a lingering shape after varied normal content; do not leave a test image running. Consult the maker if a symptom persists.
Test the built-in panel separately
If an external monitor is connected, move the browser to the laptop display or disconnect the monitor so the pattern is shown on the panel you mean to inspect. The two displays can have different scaling, color settings, and brightness. If a mark appears in one app only, compare another app and the startup view. A browser test image cannot confirm native resolution or diagnose a hardware fault.
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.