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Phone diagnostic guide

Phone: test the fault before changing parts or settings.

Run browser-safe camera, microphone, speaker, touch, display and motion checks, then use the phone maker's native diagnostics for charging, battery, cellular, NFC, biometrics and other protected hardware.

6 relevant tests3 first checksBrowser limits stated

Start with a clean baseline

Use browser-visible screen, touch, camera, microphone, speaker, sensor and connection tests as a fast functional inspection, then use the OS/manufacturer for battery-health, cellular, biometric and internal hardware diagnostics.

Live evidence

Relevant checks

Touchscreen TestDraw on the screen to verify touch/pointer coverage.
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Webcam TestOpen your webcam locally to verify that the browser can access and display a live camera stream.
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Microphone TestCheck whether your browser can detect your microphone and receive live audio.
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Left Right Speaker TestPlay left and right channel tones separately.
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Dead Pixel TestShow solid colors full-screen so you can visually inspect for dead or stuck pixels.
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Device Orientation TestWatch browser-exposed orientation angles change as you rotate a supported phone, tablet, or laptop sensor device.
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First sequence

Do the high-signal checks before risky changes

  1. 1

    Choose the symptom rather than running random resets

  2. 2

    Use DeviceOK for browser-visible components

  3. 3

    Use OEM diagnostics for protected hardware

Decision points

What the result should change

If touch/camera/audio works in browser but not one appCheck the app's permission and selected input/output before resetting the phone.
If charging is the symptomSeparate adapter wattage, cable capability, connector condition and battery/thermal limits.
If the device is used/refurbishedTest all user-facing functions before account transfer/payment, not after.
Browser can help check
  • Test browser-visible media/touch/display/sensors
  • Check permissions
Browser cannot prove
  • Read battery health/cell cycles universally
  • Test cellular/NFC/biometrics fully
  • Access protected OEM diagnostics

Repair boundary

Know when to stop browser troubleshooting

  • Swollen batteries, exposed cells or severe heat require immediate service handling.
  • Do not insert metal objects or liquids into charging ports.
  • DeviceOK cannot verify IMEI ownership, activation lock or water-resistance integrity.

Used-device inspection

What to verify before paying or signing off a repair

  • Touch across the whole panel and pixel/color inspection
  • Front/rear cameras, microphones, speakers and buttons
  • Charging/data port, Wi-Fi/Bluetooth and manufacturer battery-health screen