Dead Pixel Test with Fullscreen Color Screens

It displays uniform solid colors across the screen so you can visually inspect for pixels or subpixels that remain dark, bright or the wrong color.

Black, white, red, green and blue are the core inspection colors. Black highlights bright pixels, white highlights dark pixels, and red, green and blue help isolate subpixel faults.

A dead pixel usually remains dark because it does not illuminate. A stuck pixel or subpixel may remain bright or fixed on red, green, blue, white or another color.

No. A web page cannot inspect the physical panel directly. You visually compare the same screen location across several uniform colors.

No. This page is an inspection tool. The separate Dead Pixel Fixer provides a targeted color-cycle attempt for suspected stuck pixels, but hardware defects are not guaranteed to change.

Choose a sequence and press Start Dead Pixel Test. Then press Enter Fullscreen. Browsers require a deliberate user action before fullscreen can begin.

The browser may not support element fullscreen, may block the request, or may require a different user gesture. The tool automatically offers a browser-window focus mode as a fallback.

Press Escape or use Exit in the floating controls. If the controls are hidden, move the pointer, tap once or press H to reveal them.

Yes. Solid-color testing works in the browser. Some iPhone browser versions do not allow a normal page element to enter true fullscreen, so the tool uses a full-window focus mode instead.

Yes. Open the page on the device being tested, increase brightness to a comfortable level and use fullscreen or focus mode when available.

Yes. Move the browser window to that monitor before entering fullscreen, then cycle through the colors while inspecting the entire panel.

Yes when the television has a usable browser or is connected as a display. Make sure browser zoom, overscan and scaling do not hide the screen edges.

The solid-color method can reveal visible pixel anomalies on many display technologies. The appearance and causes of defects differ by panel type.

A black screen is useful for finding pixels that stay bright, white or colored when the rest of the panel should be dark.

A white screen makes dark pixels, dust, pressure marks and some uniformity problems easier to notice. Clean the surface first so dust is not mistaken for a defect.

Each pixel is formed from color subpixels. Separate red, green and blue screens can reveal a subpixel that fails to illuminate or remains active incorrectly.

Gray levels can make banding, dirty-screen effects, tint variation and uneven brightness easier to see, although those issues are not necessarily individual pixel defects.

A few seconds per color is usually enough for an initial scan. Large or high-resolution displays may need longer so you can inspect every region carefully.

The automatic mode is deliberately limited to slow changes of one second or longer and never starts without a user action. Stop immediately if changing colors cause discomfort.

The tool is designed for inspection rather than rapid flashing. A slower full-screen transition rate reduces unnecessary visual stimulation and gives time to inspect the panel.

Automatic cycling pauses and any screen-wake request is released. Return to the visible tab and resume deliberately.

When supported and selected, the browser may keep the display awake during an active test. The operating system or browser can still deny or release that request.

Use Right Arrow or Space for the next color, Left Arrow for the previous color, P to pause or resume automatic cycling, F for fullscreen, H to show or hide controls, and Escape to exit.

Yes. Choose Custom solid color, enter a valid hexadecimal color such as #7f7f7f and start the test.

That pattern can indicate an individual red, green or blue subpixel problem. Recheck the same physical location on black, white and the other primary colors.

Yes. Surface dust, fingerprints and small debris can resemble dark pixels on white backgrounds. Clean the display safely before deciding that a panel defect exists.

It can make those effects visible, especially on black or gray, but it cannot determine the cause or provide a professional measurement.

Solid colors may reveal persistent image retention or burn-in, but the tool does not measure severity and cannot repair panel aging.

Record the color, type and location, take a photograph when useful, then check the manufacturer pixel policy, return period, warranty or repair options.

Warranty rules vary by manufacturer, model, defect type, location and pixel count. Use the report as an inspection note, not as proof of warranty eligibility.

No page-specific request sends your display information, findings or notes to a server. They remain in the current browser session until Reset or page closure.

No account, installation or file upload is required. JavaScript must be enabled for fullscreen controls, auto cycling and report exports.