Mobile Device Hardware Servicing practice questions

A heat gun with a narrow nozzle.

Why wrong: A heat gun is used for reflowing BGA chips, not for desoldering a small port; it may overheat the board.

A Phillips-head screwdriver.

Why wrong: A screwdriver is used for screws, not for soldered components.

A plastic spudger.

Why wrong: A spudger is for prying and disconnecting cables, not for soldering.

The RAM is not compatible with the motherboard.

Why wrong: Incompatibility is possible, but beep codes more often point to seating issues; compatibility would likely cause no boot at all without beeps.

The laptop's BIOS needs to be updated.

Why wrong: BIOS updates are rarely needed for RAM upgrades; beep codes indicate a hardware fault, not a software issue.

The RAM was installed in the wrong orientation.

Why wrong: RAM modules are keyed to prevent incorrect orientation; forcing them would damage the slot.

The touchpad driver is corrupted.

Why wrong: Driver corruption is possible but less likely immediately after a liquid spill; hardware damage is the primary concern.

The battery is swollen and pressing on the touchpad.

Why wrong: A swollen battery might cause a bulging trackpad but not sudden unresponsiveness after a spill.

The touchpad is disabled in the BIOS.

Why wrong: A BIOS setting change would not occur spontaneously from a liquid spill.

Discard it as it is not needed for the screen replacement.

Why wrong: The component is part of the phone's hardware; discarding it would cause a loss of functionality.

Solder it back onto the motherboard.

Why wrong: The vibrator motor is not soldered; it connects via a flex cable or contacts, and soldering would damage it.

Leave it loose; it will not affect screen operation.

Why wrong: Leaving it loose can cause rattling and vibration failure, leading to customer dissatisfaction.

Pull the drive straight out with force to disconnect it.

Why wrong: Forcing the drive can break the SATA connector or the drive itself.

Use a plastic spudger to pry the drive from the connector.

Why wrong: Prying can damage the connector; the drive should be lifted after removing the bracket.

Remove the battery first to avoid electrical shock.

Why wrong: While removing the battery is a safety best practice, it is not the immediate next step for drive removal.

The keyboard driver is corrupted.

Why wrong: Driver issues typically cause no response or wrong characters from specific keys, not random characters from unrelated keys.

The keyboard ribbon cable is loose.

Why wrong: A loose cable would cause some keys to not work or intermittent failure, not random character output.

The operating system has a malware infection.

Why wrong: Malware can simulate keystrokes, but it would usually produce consistent patterns, not random characters on key press.

The fan is running at low speed due to a faulty fan controller.

Why wrong: The fan is spinning, so the controller is likely fine; the issue is thermal transfer, not fan speed.

The CPU is faulty and needs replacement.

Why wrong: A faulty CPU is possible but less likely than a thermal paste issue; overheating is a common symptom of poor thermal contact.

The BIOS is set to an aggressive power-saving mode.

Why wrong: Power-saving modes reduce performance, not cause overheating; they would lower temperatures.

The charging port is loose.

Why wrong: A loose charging port would cause intermittent charging, not rapid battery drain when not in use.

The power management IC is faulty.

Why wrong: While possible, a faulty PMIC is less common than battery degradation; battery issues are more typical after a year.

The screen brightness is set too high.

Why wrong: High brightness drains battery during use, but not significantly when the device is idle.

The digitizer is not compatible with the tablet model.

Why wrong: Incompatibility would typically cause no touch at all, but the technician likely ordered the correct part; a loose connection is more common.

The LCD panel was damaged during the repair.

Why wrong: The LCD works, so it is not damaged; the digitizer is separate from the LCD.

The tablet's touch controller needs to be calibrated.

Why wrong: Calibration is done after the digitizer is connected and working; no connection means no calibration possible.

The charging port is loose.

Why wrong: A loose port would cause intermittent charging or no power at all, not a consistent 'not charging' status.

The power management driver is outdated.

Why wrong: Driver issues can cause charging problems, but a hardware failure is more likely given the battery's age and symptoms.

The CMOS battery is dead.

Why wrong: A dead CMOS battery affects system clock and BIOS settings, not main battery charging.

The battery is completely drained.

Why wrong: If the battery were drained, the device wouldn't vibrate on power-on.

The digitizer is cracked.

Why wrong: A cracked digitizer doesn't cause a completely black screen; the LCD would still show an image.

The OS is corrupted.

Why wrong: A corrupted OS would typically show a boot loop or error screen, not a black screen with vibration.

The phone won't power on.

Why wrong: The power button uses a separate flex cable; dislodging volume flex does not affect power.

The touchscreen becomes unresponsive.

Why wrong: Touchscreen uses a different flex cable connected to the display assembly.

The speaker stops producing sound.

Why wrong: Speaker uses its own flex cable or soldered connections, not the volume button flex.

The digitizer is malfunctioning.

Why wrong: Digitizer failure would affect touch response, which is reported as normal.

The LCD panel has dead pixels.

Why wrong: Dead pixels cause fixed spots, not overall dimness or flickering.

The motherboard GPU is damaged.

Why wrong: GPU damage usually causes artifacts, screen corruption, or no display, not just dimness with normal OS operation.

The lithium-ion cells have degraded.

Why wrong: Degraded cells would still show some charge or cause shorter runtime, not a complete failure to charge.

The DC jack on the laptop is loose.

Why wrong: The DC jack issue would affect power to the whole system, but the system runs fine on AC adapter.

The laptop's motherboard charging circuit is damaged.

Why wrong: If the motherboard circuit were bad, the system wouldn't run on AC power either.

Replace the entire keyboard assembly.

Why wrong: The keyboard is separate from the touchpad; replacing it won't fix touchpad issues.

Replace the laptop's LCD screen.

Why wrong: The LCD screen has no relation to touchpad input.

Reinstall the operating system.

Why wrong: Driver update already done; reinstalling OS is excessive and unlikely to fix a hardware connection issue.

The charging port flex cable.

Why wrong: The charging port flex typically handles power and data, not audio routing.

The SIM card slot.

Why wrong: SIM slot only handles network identification, not audio.

The battery connector.

Why wrong: Battery connector issues would cause power problems, not selective audio failure.

Calibrate the battery by fully draining and recharging.

Why wrong: Calibration helps with inaccurate charge reporting, not with actual capacity loss.

Update the operating system to the latest version.

Why wrong: OS updates may improve efficiency but won't fix hardware degradation of the battery.

Disable all background apps and notifications.

Why wrong: This is a software workaround, not a hardware servicing solution for a degraded battery.

Replace the entire screen assembly (LCD + digitizer).

Why wrong: This is more expensive than necessary since the LCD is still functional.

Replace only the LCD panel.

Why wrong: The LCD is intact and working; replacing it doesn't fix the cracked digitizer.

Apply a glass screen protector and ignore the crack.

Why wrong: A screen protector doesn't repair the digitizer; touch may still be unreliable and the crack affects usability.

Install a screen protector on each tablet.

Why wrong: While protective, this is not essential for kiosk mode configuration.

Remove the SIM card from each tablet.

Why wrong: SIM removal is unnecessary unless cellular access is restricted; kiosk mode can be set with or without it.

Replace the stock ROM with a custom firmware.

Why wrong: Custom firmware voids warranty and is not standard practice for enterprise deployment; kiosk mode uses built-in OS features.

The webcam driver is outdated.

Why wrong: If the device isn't listed in Device Manager, the OS doesn't see the hardware; driver issues occur when the device is present but not functioning.

The laptop's BIOS has the webcam disabled.

Why wrong: A disabled BIOS setting would still show the device in Device Manager as hidden; it wouldn't cause complete absence.

The operating system needs to be reinstalled.

Why wrong: Reinstalling OS is drastic and won't fix a hardware detection issue at the motherboard level.