One color.
Look closely.
Inspect your monitor, laptop or phone with five solid colors. Nothing moves until you choose. Mark the colors you inspected and save your own checklist—not an automatic dead-pixel verdict.
Your five-color checklist
0 / 5 marked inspectedSelect a color to fill the browser page. Fullscreen is optional. Inspect at a comfortable brightness; stop if the display is uncomfortable. There is no flashing or automatic cycling.
Color view: ← / → selects the previous / next color. H hides or shows controls. Click or tap the background to show hidden controls. Esc or Exit returns here. Holding a key does not cycle colors.
A checklist, not a diagnosis.
Prepare the display
Move this browser window onto the display you want to inspect. Gently clean dust using the manufacturer’s instructions. Use a comfortable brightness and reduce glare. Browser zoom, operating-system color filters and display settings can affect what you see.
Inspect each color
Choose black, white, red, green and blue one at a time. Look across the field, including its edges, for unexpected dots, lines or patches. Hide the controls to uncover their area. You decide when to move on; the page never flashes or changes color on a timer.
Record only what you saw
Mark a color inspected only after looking at it. The optional observation is your own assessment. Finish to get a local complete or partial checklist. A complete checklist means five colors were marked—not that your screen passed a diagnostic.
For example, if you marked black, white and red but did not inspect green or blue, the report says Partial checklist: 3 of 5 colors marked inspected. It does not infer what the other colors would show.
What a browser cannot tell you
This page cannot detect pixels, distinguish dirt from damage, measure color accuracy, repair a screen or decide warranty eligibility. No camera, screen capture, hardware identifiers or pixel coordinates are requested. A screenshot is not proof of a physical panel fault: it captures rendered content, not your panel’s individual pixels.
Fullscreen support varies by browser. If it is denied or unavailable, the field fills the page but browser bars remain. This is not a substitute for a manufacturer’s built-in test, which can isolate hardware in a way browser content cannot.
Dell’s LCD built-in self-test guidance describes solid-color inspection and separate hardware diagnostics. Follow your own device’s documentation for persistent concerns. Do not press on a screen or try flashing “repair” patterns here. Fullscreen follows your browser’s Fullscreen API support and permission rules.
Your checklist stays in this tab.
The colors, marks, observations and report are local. Nothing is uploaded or saved between visits; refreshing clears the inspection. Copy and download are deliberate local exports. Optional Google Analytics and Statsig use controlled events, never your observations, exact checklist counts, pixel locations, device identifiers supplied by this tool, or report text.
For eligible U.S. visits, optional usage measurement may turn on after the regional policy resolves; elsewhere or when location is unknown, it stays off until you allow it. Saved declines and browser privacy signals override that default. Providers still receive ordinary browser/device and connection information when enabled. Analytics preferences below stays visible, and the tool works with measurement off. Read the shared privacy policy.