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LCD test

An LCD test runs full-screen solid colours - red, green, blue, white, and black - so backlight bleed, stuck pixels, and uneven illumination show against a uniform field within a few seconds. Open the tool, tap each colour swatch to fill the entire screen, and look for any dot, line, or patch that does not match the surrounding colour.

Often called a screen test or display test, this LCD check is the same quick diagnostic: show one solid colour at a time so dead or stuck pixels and backlight bleed stand out against a uniform background.

Last reviewed: 2026-05-13

Reviewed by FreetoolOnline editorial team

Property	Value
Format	Online tool, no install
Speed	Browser-side; full-screen colour cycle in seconds
Privacy	Runs locally in the browser - no upload
Implementing tool	https://freetoolonline.com/device-test-tools/lcd-test.html

Last updated: May 29, 2026

Reviewed by the Free Tool Online editorial team · Tested in the current versions of Chrome, Firefox, Safari, and Edge before publishing. No account is needed to use any tool. Report a bug - we triage within 72 hours. · Last refreshed April 2026.

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