Screen Test: Dead Pixel Check

Test your phone in minutes: dead pixel test, touch screen test, speaker, sensor, battery and CPU checks in one app. Ideal before you buy, sell or repair a phone.

Screen Test is an Android phone diagnostic app with 9 test modules: display, touch, audio, sensors, camera, refresh rate, battery, power & buttons and CPU/GPU thermal. Run each test with live results, then export a PDF report you can share.

FREE TESTS

• Display & dead pixel test – find dead, stuck or bright pixels with full-screen color and pattern tests. Check RGB colors, gradients, grayscale and panel uniformity.

• Burn-in & image retention check – spot ghosting and visible display defects.

• Touch screen test – check touch coverage, multi-touch response, unresponsive zones and ghost touches.

• Speaker & audio test – left and right channels, stereo balance, frequency range and vibration.

MORE DIAGNOSTIC TESTS

• Sensor test – accelerometer, gyroscope, compass and proximity sensor with live readings.

• Camera & flash test – front and rear cameras, zoom and LED flash.

• Refresh rate & smoothness – compare live FPS with your screen's physical refresh rate.

• Battery health & system info – battery condition, temperature, voltage, device model, Android version and resolution.

• CPU, GPU & thermal stress test – a short performance test to watch heat and thermal stability.

MORE TOOLS

• Charge Lab – record a 1, 3 or 5-minute charging run, watch the live current chart and compare runs.

• Microphone analysis – record a quiet and a speaking clip to see level, background noise and clipping.

• Storage & memory – storage and RAM use plus a short read and write speed test.

• Hands-free touch check and line check – look for ghost touches and broken lines.

• History – save results, then compare two sessions to see what changed.

• Search – find any test from the search bar on the home screen.

CARE TOOLS (FREE, NO GUARANTEE)

Try software-only steps for common annoyances: stuck pixel colour cycling, screen refresh for temporary ghost images, a speaker water and dust purge tone, compass calibration and a lens spot finder. They only try what software can try. Results are not guaranteed, and they cannot fix dead pixels, burn-in or physical damage.

PDF INSPECTION REPORT

Complete the tests and create a PDF report of your results. Useful when checking a used phone, after a screen repair, before selling, or when troubleshooting a device.

HOW UNLOCKING WORKS

Display, touch and audio tests are free. Unlock any other test by watching a short ad, or unlock all tests with a single one-time purchase.

WHO IS IT FOR

• Buyers checking a second-hand phone

• Sellers who want proof that their phone works

• Anyone after a screen repair or a drop

• Anyone troubleshooting touch, display or sound problems

FREQUENTLY ASKED QUESTIONS

How do I check my phone for dead pixels?

Open the display test and cycle through full-screen colors. Look for dots that stay black, white or the wrong color, and tap them to mark the defect.

How can I test my phone before buying it?

Run the display, touch, audio, sensor, camera and battery tests, then export the PDF report to keep a record of the results.

Does Screen Test fix hardware problems?

No. It finds and documents problems so you can decide whether to return, repair or replace the phone. The optional Care tools only try software-only steps, with no guarantee.

Note: Screen Test provides visual and sensor-based checks. It does not repair hardware damage, and results may vary by device.