Dead pixel inspection
Inspect solid colors for dark, bright or stuck pixels and record what you see.
Clean the screen. Inspect black, white, red, green and blue in fullscreen, then choose an observation.
Enable JavaScript to run this interactive test. The guide and methodology below remain available.
How to run this check
Clean the screen. Inspect black, white, red, green and blue in fullscreen, then choose an observation.
Understand the result
PASS describes a received signal or your recorded observation. WARNING calls for another check. USER REVIEW REQUIRED means a measurement alone cannot decide. An unavailable API or denied permission does not establish hardware failure.
What this cannot tell you
This is a visual inspection: the browser cannot see physical pixel defects or repair dead pixels.
If something seems wrong
Clean suspected marks, inspect from another angle, and photograph persistent defects for the seller.
Find troubleshooting help →Good to know
Is anything uploaded?
Raw diagnostic input and media are processed locally. Results remain in this page’s memory until you download a report or leave. Hosting requests still reach the site host. See the privacy policy.
Does a pass guarantee my hardware is healthy?
No. It records behavior observed in this browser session. Intermittent faults, internal components and operating-system restrictions need further investigation. See our methodology.