Gypes

Full-display visual inspection

Dead pixel test

Fill the browser with uniform colors and inspect every part of the display for pixels that remain dark, bright, or the wrong color.

The test starts with black, then cycles through white, red, green, blue, cyan, magenta, yellow, and neutral grays.

Available test colors

Before you begin

  1. Clean the screen gently using the manufacturer’s instructions; dust can resemble a bad pixel.
  2. Use the display’s normal native resolution and a comfortable brightness.
  3. Inspect at a typical viewing distance, then look more closely without pressing the panel.
  4. Test each connected display separately by moving this browser window to it first.

How solid colors reveal pixel defects

Different uniform backgrounds make different defects easier to see. Black can reveal pixels that remain bright; white can expose dark pixels and uneven shading; red, green, and blue help isolate color subpixels; cyan, magenta, and yellow exercise pairs of subpixels; neutral grays can reveal tint, banding, clouding, or brightness nonuniformity.

Using the full-screen test

Start the test and allow full-screen mode if the browser offers it. Click or tap the empty color area, use the arrow keys, or press Space to advance. Press H or use “Hide controls” so the control panel does not cover pixels; pressing H again restores it. Exit returns to this explanation. Browser or operating-system bars can remain visible when full-screen mode is unavailable or denied.

Dead, stuck, and bright pixels

A pixel or subpixel that consistently fails to change across backgrounds may be defective, but dust, debris, a reflection, screen coating, content scaling, image retention, cable errors, compression, and graphics-driver problems can look similar. Capture the location, repeat the test after restarting, and compare another input or device where possible. A screenshot cannot record a physical panel defect, so use a separate camera only if documentation is required.

Do not press or flash the panel

Pressing, rubbing, heating, tapping, or running rapid flashing “repair” patterns can damage a display, aggravate symptoms, or create seizure and migraine risks. This page performs inspection only and does not claim to repair pixels. Pixel-defect warranty policies vary by manufacturer, panel class, defect type, count, location, and purchase terms.

This visual aid cannot certify a display or determine warranty eligibility. If a suspected defect persists, follow the manufacturer’s diagnostic and warranty process without physically manipulating the panel.