How this test works
Cycle through solid colors and inspect the panel visually. The test uses standard browser capabilities and does not require installing an application.
When to use it
- Before buying a used or refurbished laptop.
- When troubleshooting a device after a repair or update.
- Before selling or handing a device to someone else.
Important limitations
A website cannot fully diagnose every hardware component. Treat the result as a practical screening check. For faults that matter financially or affect safety, use operating-system diagnostics or a qualified repair technician.
Frequently asked questions
What is a dead pixel?
A dead pixel typically remains dark because its subpixels are not producing light. A stuck pixel may remain on one color.
Can this tool fix dead pixels?
No. It helps you inspect the display visually; it does not repair the panel.
Related device tests
Run the complete used-laptop checkup or continue with the device information test.