Courseiva

CCNA Mobile Device Hardware Servicing Questions

30 questions · Mobile Device Hardware Servicing · All types, answers revealed

Practice these questionsDomain overviewAll questions
1
MCQmedium

A customer brings in a smartphone with a broken charging port. They want the port replaced. During disassembly, the technician finds that the charging port is soldered directly to the main board. Which tool is essential for this repair?

A.A heat gun with a narrow nozzle.
B.A soldering iron with a fine tip.
C.A Phillips-head screwdriver.
D.A plastic spudger.
AnswerB

A fine-tip soldering iron allows precise desoldering and soldering of the small pins on the charging port.

Why this answer

A soldered charging port requires desoldering to remove it and reflow soldering to install the new one. A soldering iron with a fine tip is necessary for this precision work. Using a heat gun alone could damage nearby components.

Practice this question →
2
MCQmedium

A user reports that their smartphone's charging port is loose and the cable falls out easily, making it difficult to charge. The technician inspects the port and sees no visible debris. What is the most likely cause and the appropriate repair?

A.The charging cable is defective; replace the cable.
B.The charging port has worn-out pins; replace the charging port assembly.
C.Use compressed air to blow out the port.
D.Apply a small amount of super glue to the port to tighten it.
AnswerB

Worn pins cause a loose connection. Replacing the entire port assembly restores a snug fit and reliable charging.

Why this answer

A loose charging port is typically caused by worn or bent internal pins from repeated plugging and unplugging. The correct repair is to replace the charging port assembly, as the pins cannot be individually repaired. Cleaning would not help if the pins are physically damaged.

Practice this question →
3
MCQmedium

A technician is tasked with upgrading the RAM in an all-in-one (AIO) desktop. The AIO has a sealed back cover with several screws. After removing the screws, the cover still does not come off. What should the technician do next?

A.Use a flathead screwdriver to pry the cover off forcefully.
B.Check if there are hidden screws under rubber feet or stickers.
C.Use a plastic spudger to gently pry the cover along the seam to release clips.
D.Apply heat to the back cover to soften any adhesive.
AnswerC

Plastic spudgers are designed for safe prying and releasing clips without damaging the case. This is the standard technique for AIO covers.

Why this answer

Many AIO designs use plastic clips in addition to screws to secure the back cover. The technician should carefully pry along the seam with a plastic spudger to release the clips without damaging the casing. Forcing the cover can crack the plastic.

Practice this question →
4
MCQmedium

A technician is upgrading the RAM in a laptop. After installing two new 8GB sticks, the laptop fails to boot and emits a series of beeps. What is the most likely cause?

A.The RAM is not compatible with the motherboard.
B.The RAM modules are not fully seated in the slots.
C.The laptop's BIOS needs to be updated.
D.The RAM was installed in the wrong orientation.
AnswerB

Improper seating is a common error; the modules should click into place and the clips should lock.

Why this answer

Beep codes usually indicate a memory error. The most common cause is improperly seated RAM modules. Even if the modules are compatible, they must be fully inserted and locked into place.

Reseating the RAM often resolves the issue.

Practice this question →
5
MCQhard

A user reports that their tablet's screen is completely black but the device vibrates when powered on. You have already tried a forced restart and checked for physical damage. What is the most likely hardware cause?

A.The battery is completely drained.
B.The LCD panel or display ribbon cable is faulty.
C.The digitizer is cracked.
D.The OS is corrupted.
AnswerB

A black screen with vibration indicates the device boots but the display subsystem is not working, often due to a failed LCD or loose cable.

Why this answer

This question tests diagnosis of a no-display condition with power-on indication. Vibration confirms the device is booting, so the issue is likely with the display assembly or its connection. A failed LCD panel or a loose display cable is the most probable cause, as the backlight or digitizer failure would still show some light or touch response.

Practice this question →
6
MCQmedium

During a repair, you accidentally dislodged a small ribbon cable connecting the volume button flex to the mainboard of a smartphone. Now the volume buttons don't work. What is the most likely result of this mistake?

A.The phone won't power on.
B.The touchscreen becomes unresponsive.
C.The volume buttons become unresponsive.
D.The speaker stops producing sound.
AnswerC

The dislodged flex cable directly controls volume; without connection, buttons don't work.

Why this answer

This question tests knowledge of flex cable connections. The volume button flex cable is a separate component that connects to the mainboard via a ZIF or latch connector. If dislodged, the buttons lose electrical connection and become non-functional, but other features remain unaffected.

Practice this question →
7
MCQhard

A technician is replacing the display assembly on a laptop. After installing the new display, the laptop powers on but the screen remains black. The technician has verified the display cable is fully seated at both ends. What should the technician check next to diagnose the issue?

A.Replace the LCD panel again, assuming the new one is defective.
B.Check the backlight voltage or inverter board (if applicable).
C.Update the graphics driver from the Windows Recovery Environment.
D.Reseat the RAM modules to ensure proper boot.
AnswerB

A black screen with power on suggests the backlight is not working. Checking the inverter or backlight circuit can identify the faulty component.

Why this answer

The technician should check the inverter or backlight circuit if the laptop uses a CCFL backlight, or the LED backlight voltage on newer models. A black screen with power on often indicates a backlight failure, not a complete display failure. The technician can shine a bright light at the screen to see if there is a faint image, confirming the backlight is the issue.

Practice this question →
8
MCQmedium

A customer reports that after a recent fall, their smartphone's screen is completely black, but the device still vibrates when calls come in. The technician suspects the display cable is loose. What is the correct sequence of steps to access and reseat the display cable?

A.Remove the battery first, then the back cover, and reseat the display cable.
B.Remove the back cover, disconnect the battery, then reseat the display cable.
C.Reseat the display cable by inserting a spudger through the charging port.
D.Perform a factory reset to rule out software issues.
AnswerB

This is the correct sequence: back cover off, battery disconnected for safety, then reseat the display cable. It prevents short circuits and damage.

Why this answer

To access the display cable, the technician must first remove the back cover, then the battery (if not integrated), and disconnect the display cable from the motherboard. This sequence ensures safe access without risking a short circuit from a live battery. The display cable is typically a thin ribbon cable near the motherboard.

Practice this question →
9
MCQeasy

A customer reports that their laptop's touchpad is unresponsive after they spilled a small amount of liquid on the keyboard. The laptop still powers on and the keyboard works. What is the most likely issue?

A.The touchpad driver is corrupted.
B.The touchpad ribbon cable is damaged or disconnected.
C.The battery is swollen and pressing on the touchpad.
D.The touchpad is disabled in the BIOS.
AnswerB

Liquid can corrode or short the touchpad's ribbon cable, causing it to stop working while the keyboard (on a different circuit) still functions.

Why this answer

The touchpad is likely disconnected or shorted due to liquid ingress, even though the keyboard still works. In many laptops, the touchpad connects via a separate ribbon cable that can be damaged by liquid. The first step should be to inspect and reseat or replace the touchpad cable.

Practice this question →
10
MCQeasy

A customer complains that their laptop battery no longer holds a charge and the laptop only works when plugged in. The technician confirms the battery is removable. What is the most appropriate first step in servicing this issue?

A.Update the battery driver in Device Manager.
B.Run a battery calibration utility from the manufacturer.
C.Power off the laptop and remove the battery.
D.Replace the AC adapter to see if the charging circuit is faulty.
AnswerC

Powering off and removing the battery is the safe first step before replacing it. This prevents electrical hazards and damage.

Why this answer

The correct first step is to power off the laptop and remove the battery. This ensures safety and prevents electrical shorts or damage during replacement. After removal, the technician can install a new battery.

Practice this question →
11
MCQeasy

A technician is replacing a cracked screen on a smartphone. After removing the old screen, they notice a small, flat, rectangular component with a metal shield is loose near the battery connector. What should they do?

A.Discard it as it is not needed for the screen replacement.
B.Reattach it using double-sided adhesive tape.
C.Solder it back onto the motherboard.
D.Leave it loose; it will not affect screen operation.
AnswerB

The vibrator motor is typically held in place with adhesive; using new adhesive ensures it stays secure.

Why this answer

The loose component is likely the vibrator motor, which is often a small rectangular module that can become dislodged during disassembly. It should be securely reattached to prevent rattling and ensure proper vibration function. Ignoring it could lead to customer complaints about missing vibration alerts.

Practice this question →
12
MCQeasy

A technician is installing a new SSD into a customer's laptop. After removing the bottom cover, they see the existing hard drive is held in place by a metal bracket and a single screw. What is the correct next step?

A.Remove the screw and bracket, then gently lift the drive out of the SATA connector.
B.Pull the drive straight out with force to disconnect it.
C.Use a plastic spudger to pry the drive from the connector.
D.Remove the battery first to avoid electrical shock.
AnswerA

This is the correct method to safely remove the drive without damaging the connector.

Why this answer

Removing the bracket and screw allows the drive to be lifted or slid out of its connector. This is standard procedure for 2.5-inch drives in laptops. The technician must also disconnect any attached cables before removal.

Practice this question →
13
MCQeasy

A user brings in a smartphone with a cracked screen that is still responsive to touch. The device is an older model, and the user wants the screen replaced rather than buying a new phone. After powering off the device and removing the SIM and SD cards, what is the next step in the screen replacement process?

A.Use a spudger to pry the screen off starting from the bottom.
B.Apply heat to the edges of the screen to soften the adhesive.
C.Remove the battery using a plastic pry tool.
D.Insert a guitar pick under the screen to separate it from the frame.
AnswerB

Heating the edges softens the adhesive, allowing the screen to be lifted with minimal force and reducing the risk of further damage.

Why this answer

The correct first step after powering off and removing removable components is to carefully heat the edges of the screen to soften the adhesive that holds it in place. This prevents cracking the glass further or damaging the frame. Attempting to pry the screen off cold can cause additional damage.

Practice this question →
14
MCQmedium

A technician is troubleshooting a tablet that has a dim display that flickers intermittently. The device responds to touch and the OS loads normally. Which component is most likely failing?

A.The digitizer is malfunctioning.
B.The LCD panel has dead pixels.
C.The backlight LED or inverter is failing.
D.The motherboard GPU is damaged.
AnswerC

A failing backlight causes dim, flickering display while touch and OS remain functional.

Why this answer

This question differentiates between LCD and backlight failures. A dim, flickering display with normal touch and OS function points to a backlight issue, often caused by a failing LED driver or inverter. The LCD panel itself may be fine.

Practice this question →
15
MCQeasy

A user reports that their laptop battery no longer charges and the system only runs when plugged in. You test the AC adapter and it outputs correct voltage. Inside the battery, which component is most likely failed?

A.The lithium-ion cells have degraded.
B.The battery management system (BMS) is faulty.
C.The DC jack on the laptop is loose.
D.The laptop's motherboard charging circuit is damaged.
AnswerB

A failed BMS prevents the battery from communicating with the charger and accepting power, causing no charging.

Why this answer

This question covers battery charging circuitry. The battery management system (BMS) controls charging and communicates with the laptop. If the BMS fails, the battery may not accept a charge even if cells are good.

The AC adapter is verified working, so the issue is inside the battery.

Practice this question →
16
MCQmedium

A laptop's touchpad is not working correctly; the cursor jumps erratically. You have already updated the driver and checked for debris. What hardware component should you inspect or replace next?

A.Replace the entire keyboard assembly.
B.Reseat the touchpad ribbon cable on the motherboard.
C.Replace the laptop's LCD screen.
D.Reinstall the operating system.
AnswerB

A loose or partially connected ribbon cable is a common cause of erratic touchpad behavior.

Why this answer

This question tests systematic troubleshooting of input devices. After ruling out software and debris, the next step is to check the touchpad's ribbon cable connection to the motherboard. A loose or damaged cable can cause erratic behavior.

Replacing the touchpad itself is a later step.

Practice this question →
17
MCQhard

A technician is servicing a smartphone with a non-functional earpiece speaker during calls, but the loudspeaker works fine. After testing, the earpiece speaker itself is determined to be good. Which component is most likely faulty?

A.The charging port flex cable.
B.The mainboard audio IC (codec).
C.The SIM card slot.
D.The battery connector.
AnswerB

The audio IC controls which speaker receives sound; a fault here can disable the earpiece while leaving the loudspeaker functional.

Why this answer

This question tests understanding of audio routing in mobile devices. The audio IC or codec manages which speaker is used. If the earpiece speaker is good but doesn't work, the audio IC may be damaged, or the connection traces are broken.

The loudspeaker working suggests the audio path for that output is intact.

Practice this question →
18
MCQmedium

During a laptop keyboard replacement, a technician accidentally dislodges a small ribbon cable from the touchpad connector. The touchpad is now unresponsive. The technician has never worked on this model before. What is the best course of action to resolve the issue?

A.Use tweezers to gently push the ribbon cable into any nearby empty connector.
B.Reboot the laptop to see if the touchpad driver reloads.
C.Consult the service manual to identify the correct connector and reseat the cable.
D.Replace the entire keyboard assembly since the touchpad cable is likely broken.
AnswerC

The service manual provides the exact location and orientation for the touchpad ribbon cable, ensuring proper reconnection.

Why this answer

The technician should consult the device's service manual to locate the correct connector and properly reseat the ribbon cable. This ensures the cable is aligned and locked in place, restoring touchpad functionality. Guessing or forcing the cable can damage the connector.

Practice this question →
19
MCQmedium

A user reports that their laptop's keyboard types random characters when certain keys are pressed. The laptop has not been dropped or spilled on. What is the most likely hardware issue?

A.The keyboard driver is corrupted.
B.The keyboard ribbon cable is loose.
C.The keyboard has an internal short or faulty controller.
D.The operating system has a malware infection.
AnswerC

An internal short can cause ghost key presses, leading to random characters. Replacement is necessary.

Why this answer

A faulty keyboard controller or a short in the keyboard matrix can cause random character output. This is a hardware failure within the keyboard assembly. Replacing the keyboard is the standard fix, as individual key repairs are not practical.

Practice this question →
20
MCQhard

A technician is troubleshooting a laptop that shuts down randomly after a few minutes of use. The fan is spinning, and the vents are clear. The CPU temperature reaches 95°C quickly. What is the most likely cause?

A.The fan is running at low speed due to a faulty fan controller.
B.The thermal paste between the CPU and heatsink has dried out.
C.The CPU is faulty and needs replacement.
D.The BIOS is set to an aggressive power-saving mode.
AnswerB

Dried thermal paste reduces heat transfer, causing rapid overheating even with a working fan.

Why this answer

High CPU temperature despite a spinning fan indicates poor thermal transfer, often due to dried-out thermal paste or a heatsink that is not making proper contact. Reapplying thermal paste and reseating the heatsink is the solution. The fan working rules out a fan failure.

Practice this question →
21
MCQmedium

A user complains that their smartphone's battery drains quickly even when idle. You run diagnostics and find the battery health is at 82%. The device is two years old. Which hardware servicing action is most appropriate?

A.Replace the battery with a new OEM battery.
B.Calibrate the battery by fully draining and recharging.
C.Update the operating system to the latest version.
D.Disable all background apps and notifications.
AnswerA

At 82% health, the battery is degraded; replacement directly addresses the drain issue.

Why this answer

This question tests battery replacement thresholds. A battery health below 80-85% often indicates significant degradation, causing poor runtime. Replacing the battery restores normal battery life.

Software optimization may help but is secondary to hardware replacement.

Practice this question →
22
MCQmedium

A technician is replacing a cracked screen on a tablet. After removing the digitizer and LCD assembly, they notice the home button flex cable is torn. The tablet still has a physical home button. What should the technician do to ensure the repair is complete and the home button functions?

A.Solder the torn ends of the flex cable together.
B.Use electrical tape to hold the torn cable together.
C.Replace the home button flex cable with a new one.
D.Ignore the tear and reassemble the tablet.
AnswerC

Replacing the torn flex cable with a new one restores the electrical connection, allowing the home button to function properly.

Why this answer

The torn flex cable must be replaced because it is essential for the home button to communicate with the motherboard. Simply reconnecting a torn cable will not restore function. The technician should order a replacement home button flex cable and install it.

Practice this question →
23
MCQhard

A technician is replacing the battery in a slim laptop where the battery is glued inside the chassis. After removing the bottom cover, the technician sees the battery is firmly attached with adhesive. What is the safest method to remove the battery without damaging the laptop?

A.Use a flathead screwdriver to pry the battery out forcefully.
B.Apply isopropyl alcohol around the battery edges to weaken the adhesive, then gently pry with a plastic spudger.
C.Heat the battery with a heat gun to soften the adhesive.
D.Use a suction cup to pull the battery straight up.
AnswerB

Isopropyl alcohol safely dissolves the adhesive without damaging the battery or laptop. A plastic spudger prevents punctures.

Why this answer

The safest method is to apply isopropyl alcohol along the edges of the battery to dissolve the adhesive, then gently pry with a plastic spudger. This minimizes the risk of puncturing the battery, which could cause a fire or chemical leak. Using metal tools or excessive force is dangerous.

Practice this question →
24
MCQeasy

A customer brings in a smartphone with a cracked glass digitizer that still responds to touch, but the LCD underneath is intact. They want the cheapest repair that restores full functionality. Which component should you replace?

A.Replace the entire screen assembly (LCD + digitizer).
B.Replace only the LCD panel.
C.Replace only the digitizer.
D.Apply a glass screen protector and ignore the crack.
AnswerC

The digitizer is the damaged part; replacing it restores touch functionality at the lowest cost.

Why this answer

This question tests knowledge of mobile device component layers and repair options. The digitizer is the touch-sensitive layer; if it's cracked but the LCD is fine, replacing just the digitizer is the most cost-effective solution. Replacing the entire screen assembly would be more expensive and unnecessary.

Practice this question →
25
MCQeasy

You are deploying 50 tablets for a school and need to secure them in kiosk mode so students can only access a specific learning app. Which hardware servicing step is essential before configuring the software?

A.Install a screen protector on each tablet.
B.Charge each tablet to at least 50% and apply all system updates.
C.Remove the SIM card from each tablet.
D.Replace the stock ROM with a custom firmware.
AnswerB

A charged, updated device ensures stable configuration without power loss or update interruptions.

Why this answer

This question tests understanding of device preparation for deployment. Before any software configuration, you must ensure the device has a full charge and is updated to avoid interruptions. Kiosk mode is set via software after the device is ready.

Practice this question →
26
MCQhard

A technician is servicing a tablet that will not power on. The technician has confirmed the battery is charged by testing it with a multimeter (voltage within spec). The power button feels normal when pressed. What is the most likely hardware component that has failed, and how should it be addressed?

A.Replace the LCD screen assembly.
B.Replace the motherboard.
C.Reseat or replace the power button flex cable.
D.Perform a hard reset by holding the power and volume buttons for 30 seconds.
AnswerC

A loose or damaged power button flex cable can prevent the power button from sending the signal to the motherboard, even if the button feels normal.

Why this answer

If the battery is charged and the power button is functional, the most likely cause is a faulty power button flex cable or a loose connection. The technician should open the tablet, locate the power button flex cable, and reseat or replace it. This cable can wear out or become disconnected over time.

Practice this question →
27
MCQeasy

A user complains that their tablet's battery drains very quickly, even when not in use. The device is one year old and was working normally until last week. Which hardware component is most likely failing?

A.The charging port is loose.
B.The battery has degraded or is failing.
C.The power management IC is faulty.
D.The screen brightness is set too high.
AnswerB

A failing battery cannot hold a charge and will discharge quickly, even in standby.

Why this answer

A lithium-ion battery that drains quickly, especially when idle, often indicates the battery has degraded or developed an internal short. Batteries have a finite lifespan and can fail after a year of use. Replacing the battery is the standard fix.

Practice this question →
28
MCQhard

A laptop's built-in webcam is not recognized by any application. You have checked Device Manager and the camera is not listed. The webcam ribbon cable appears intact. Which component should you suspect next?

A.The webcam driver is outdated.
B.The laptop's BIOS has the webcam disabled.
C.The webcam module or motherboard USB controller has failed.
D.The operating system needs to be reinstalled.
AnswerC

Complete absence from Device Manager suggests a hardware failure of the camera module or the motherboard's internal USB controller.

Why this answer

This question tests knowledge of internal USB device enumeration. The webcam is typically connected via an internal USB header on the motherboard. If the camera is not detected at all, the motherboard's USB controller or the camera module itself may be faulty.

A loose cable would cause intermittent detection, but the cable is intact.

Practice this question →
29
MCQhard

A technician is repairing a tablet that has a cracked digitizer. The LCD panel is intact and displays correctly. After replacing the digitizer, the touch input is unresponsive. What is the most likely oversight?

A.The digitizer is not compatible with the tablet model.
B.The digitizer flex cable is not fully seated in the connector.
C.The LCD panel was damaged during the repair.
D.The tablet's touch controller needs to be calibrated.
AnswerB

A partially seated cable will prevent touch input while the display works. Reseating the cable usually fixes it.

Why this answer

The digitizer connects via a separate flex cable that must be properly seated. If the LCD works but touch does not, the digitizer cable is likely not fully inserted or the connector is damaged. This is a common error during digitizer-only replacements.

Practice this question →
30
MCQmedium

A technician is troubleshooting a laptop that will not charge. The battery is removable, and the power adapter works on another laptop. When the battery is inserted, the laptop powers on but shows '0% available (plugged in, not charging)'. What is the most likely cause?

A.The battery is defective and needs replacement.
B.The charging port is loose.
C.The power management driver is outdated.
D.The CMOS battery is dead.
AnswerA

A battery that cannot charge despite being detected is typically failed; replacing it resolves the issue.

Why this answer

The 'plugged in, not charging' message often indicates a failed battery that cannot accept a charge, even though the system detects it. A defective battery cell will prevent charging. The power adapter and charging circuit are likely fine since the laptop powers on.

Practice this question →

Ready to test yourself?

Try a timed practice session using only Mobile Device Hardware Servicing questions.

Start 20-question session