Mobile Devices Troubleshooting practice questions

The battery is completely dead and needs replacement

Why wrong: A dead battery would not prevent the phone from showing a charging indicator when connected to power; the phone should at least show a low battery icon.

The operating system is corrupted

Why wrong: A corrupted OS would typically cause boot loops or other system issues, not specifically prevent charging.

The phone's wireless charging coil is damaged

Why wrong: A damaged wireless charging coil would not affect wired charging through the Lightning port.

A software glitch caused by a recent app update

Why wrong: Software glitches typically cause freezes or crashes, not persistent hardware-like symptoms such as vertical lines.

The battery is swelling and pressing against the display

Why wrong: A swollen battery would likely cause physical distortion or a bulge, not just flickering and lines without any visible deformation.

The phone's processor is overheating

Why wrong: Overheating can cause performance throttling or shutdowns, but it rarely produces specific display artifacts like vertical lines.

Reseat the RAM modules

Why wrong: Reseating RAM is a valid step, but it is more invasive than connecting an external monitor and should be done after checking the display output.

Replace the LCD panel

Why wrong: Replacing the LCD panel without first confirming the issue is with the display is premature and could be unnecessary.

Reinstall the operating system

Why wrong: Since the laptop does not show any boot activity, reinstalling the OS is not possible and would not address a hardware display issue.

Replace the laptop's Wi-Fi card

Why wrong: Replacing hardware should be considered only after software and driver issues have been ruled out.

Disable the firewall

Why wrong: Disabling the firewall is a security risk and is unlikely to resolve a driver-related connectivity problem.

Reset the router

Why wrong: Since other devices work fine, the router is not the issue; resetting it would be unnecessary and disruptive.

The CPU

Why wrong: A faulty CPU would typically cause a system to not boot, but it would not cause a specific blinking battery light pattern.

The RAM

Why wrong: Faulty RAM can cause boot failures, but it does not affect the battery charging indicator.

The hard drive

Why wrong: A failed hard drive would not prevent the laptop from powering on or affect the battery charging light.

Set the screen timeout to 30 minutes

Why wrong: Increasing screen timeout keeps the screen on longer, but it drains the battery and does not guarantee Wi-Fi stays connected when the screen eventually turns off.

Disable Bluetooth

Why wrong: Disabling Bluetooth saves battery but does not affect the Wi-Fi sleep behavior.

Install a third-party app to keep the screen on

Why wrong: Using a third-party app is unnecessary and may introduce security risks; the built-in Wi-Fi sleep setting is the correct solution.

Replace the battery immediately

Why wrong: Replacing the battery without first verifying it is the cause is premature and could waste time and resources.

Perform a hard reset by holding the power and volume buttons

Why wrong: A hard reset is useful for a frozen device, but if the device is completely unresponsive and has no power, it may not help.

Open the tablet and inspect the motherboard for damage

Why wrong: Opening the device should be a last resort after simpler checks like charging and verifying the power button function.

Update the touchpad driver

Why wrong: While driver issues can cause problems, cleaning the touchpad is a quicker and less invasive first step.

Disable the touchpad in Device Manager and re-enable it

Why wrong: This is a troubleshooting step but should come after cleaning, as it is more time-consuming.

Replace the touchpad

Why wrong: Replacing the touchpad is a last resort after all other troubleshooting has failed.

The battery is defective and needs replacement

Why wrong: While possible, a defective battery is less likely in a relatively new phone; software issues are more common.

The screen brightness is set too high

Why wrong: High screen brightness can drain the battery, but it would not cause rapid drain when the phone is idle.

The phone is infected with a virus

Why wrong: While malware can cause battery drain, it is less common than a misbehaving app; checking app battery usage is a more straightforward first step.

The LCD panel is damaged

Why wrong: The LCD panel is responsible for the display; since the screen powers on normally, the LCD is likely undamaged.

The battery is swollen

Why wrong: A swollen battery would typically cause physical bulging, not isolated touchscreen unresponsiveness, and the device powers on normally.

The operating system is corrupted

Why wrong: OS corruption would likely cause boot loops or other system-wide issues, not a specific loss of touch input after a physical drop.

The battery has expanded due to heat and disconnected from the logic board

Why wrong: Battery expansion can occur, but it usually takes longer exposure or a damaged battery. The immediate symptom after heat exposure is more likely thermal protection.

The device's logic board has been permanently damaged by heat

Why wrong: Permanent damage is possible, but the most likely and reversible cause is thermal shutdown. The device should be allowed to cool first.

The power button is stuck due to heat expansion

Why wrong: A stuck button might prevent pressing, but it would not explain the complete lack of response. Thermal shutdown is the standard behavior.

Replace the laptop's battery

Why wrong: A faulty battery might not hold a charge, but it would not prevent the charging LED from lighting when the adapter is plugged in.

Update the laptop's BIOS

Why wrong: A BIOS update is unlikely to resolve a hardware power delivery issue, especially when the adapter is known to output voltage.

Replace the AC adapter with a universal one

Why wrong: Since the original adapter outputs correct voltage, replacing it is unnecessary and would not fix a broken DC jack.

The touchpad driver has been corrupted by the liquid

Why wrong: Liquid does not corrupt drivers; it causes physical damage. The driver would still be intact unless the liquid damaged the storage, which is unlikely.

The touchpad has been disabled in the BIOS due to a safety feature

Why wrong: No such safety feature exists in typical BIOS. The touchpad would not be automatically disabled by liquid detection.

The laptop's operating system has detected the liquid and disabled input devices

Why wrong: Consumer laptops do not have liquid detection that disables input devices. This is not a standard feature.

The battery is nearing the end of its life and cannot hold a charge

Why wrong: A failing battery would show reduced capacity in the battery report, but it would not cause high CPU usage by the System process.

A background app is consuming CPU resources

Why wrong: While background apps can cause CPU usage, the report specifically shows the 'System' process, which is a core OS process. A third-party app would appear under a different process name.

The tablet's power plan is set to 'High performance'

Why wrong: A high-performance power plan can increase power draw, but it would not specifically cause the System process to use high CPU. The System process usage indicates a deeper issue.

The keyboard's battery is low

Why wrong: Low battery can cause intermittent issues, but it usually results in disconnection rather than slow typing with missed keystrokes. The scanner works fine, suggesting the Bluetooth radio is functional.

The tablet's Bluetooth driver is outdated

Why wrong: An outdated driver could cause general Bluetooth issues, but the scanner works perfectly, making a driver problem less likely.

The keyboard is not compatible with Android

Why wrong: If the keyboard pairs and connects, it is compatible. Missed keystrokes are a performance issue, not a compatibility one.

The laptop's display cable has become disconnected

Why wrong: A disconnected display cable would cause a blank screen but not beep codes. The beeps indicate a hardware failure detected during POST.

The laptop's CMOS battery is dead

Why wrong: A dead CMOS battery can cause time/date errors but typically does not produce beep codes or prevent the system from posting.

The user accidentally damaged the motherboard when installing the RAM

Why wrong: While possible, this is less likely than simple incompatibility or improper seating. The beep code is a specific indicator that the system is detecting a hardware issue, often related to the newly installed component.

Uninstall and reinstall the camera driver

Why wrong: Reinstalling the driver might help if the driver is corrupted, but the device was disabled, and after enabling it, the issue persists. Driver reinstall is premature without checking privacy settings.

Replace the webcam module

Why wrong: Replacing hardware should be a last resort after software and settings checks. The camera was recognized by the system, indicating it is likely functional.

Update the laptop's BIOS

Why wrong: A BIOS update is unlikely to affect webcam functionality that is already recognized by the OS. This is not a typical troubleshooting step for a disabled camera.

The device's battery is swollen and pressing against the display

Why wrong: A swollen battery can cause physical pressure and bulging, but it typically does not cause immediate touch unresponsiveness and color distortion after a drop in water.

The device's operating system has corrupted due to water exposure

Why wrong: While water can cause electrical shorts, it does not directly corrupt the OS. The OS would still load if the hardware is functional.

The screen protector is trapping moisture and blocking touch input

Why wrong: A screen protector might trap moisture, but it would not cause color distortion on the display itself.

Replace the LCD panel

Why wrong: Replacing the panel is premature. The display worked before closing the lid, so the panel itself is likely fine. The issue is more likely a wake-from-sleep problem.

Reseat the RAM modules

Why wrong: Reseating RAM is a troubleshooting step for no POST or beep codes, but the laptop is already on (fan spinning, power LED). This is not the first step for a blank screen after lid closure.

Check the laptop's lid sensor for damage

Why wrong: A faulty lid sensor could cause the display to stay off, but checking it requires disassembly. A hard reset is a quicker, non-invasive first step.

The USB cable is defective

Why wrong: While possible, a defective cable is less likely than a software setting issue, especially since the tablet is charging (assuming it does).

The tablet's USB port is damaged from the drop

Why wrong: A cracked screen does not necessarily mean the USB port is damaged. The tablet still charges, indicating the port is likely functional.

The PC lacks the proper Samsung USB drivers

Why wrong: Missing drivers could cause recognition failure, but the more immediate issue is the USB mode setting on the tablet.