Practice Test Geeks(CMT) Certified Mobile Tech Practice Test
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Device Troubleshooting & Repair Flashcards

7 cards from real CMT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Device Troubleshooting & Repair flashcards as text

  1. A smartphone powers on but the touchscreen is completely unresponsive after a drop. The display shows the home screen correctly. What is the most likely cause?

    Answer: Digitizer layer damage or disconnected digitizer cable

    A drop can crack or disconnect the digitizer (touch sensor layer) while leaving the display itself functional.

  2. After replacing a phone battery, the device reports 0% charge and shuts down immediately even though the new battery is fully charged. What should you check first?

    Answer: Inspect the battery connector pins and re-seat the connector

    A loose or misaligned battery connector prevents proper voltage reading and causes the device to shut down as if the battery is dead.

  3. A tablet's front camera works but the rear camera app crashes immediately upon launch. Other apps function normally. What is the most likely cause?

    Answer: Defective rear camera module or its flex cable

    A hardware failure in the rear camera module or a disconnected/damaged flex cable causes the camera app to crash when trying to access that specific sensor.

  4. A customer's phone overheats during light tasks and the battery drains in under 2 hours. Battery health shows 41%. What repair is indicated?

    Answer: Replace the battery

    A battery at 41% health has severely degraded capacity and internal resistance, causing it to generate excessive heat under even minimal load.

  5. During a screen replacement, you accidentally leave a fingerprint on the OLED panel's inner surface. What is the correct procedure?

    Answer: Wipe with an isopropyl alcohol-dampened microfiber cloth

    IPA on a microfiber cloth safely removes oils from the inner OLED surface without damaging the panel coating.

  6. A phone's speaker produces distorted audio at all volume levels but earpiece audio is clear. Which component should you replace?

    Answer: Loudspeaker/bottom speaker assembly

    Distortion across all volumes while earpiece remains clear isolates the fault to the loudspeaker unit itself.

  7. A device shows 'No SIM Card Detected' after a repair. The SIM card and tray are correctly installed. What should you check?

    Answer: Inspect and re-seat the SIM card reader connector on the motherboard

    Repairs often disturb the SIM reader connector; a loose connector causes the device to fail to detect a properly inserted SIM.