220-1201 Hard Questions — 25 Difficult Questions

Question 1

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?

Accepted Answer

The digitizer flex cable is not fully seated in the connector.. 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.

Answer

The digitizer is not compatible with the tablet model.

Answer

The LCD panel was damaged during the repair.

Answer

The tablet's touch controller needs to be calibrated.

Question 2

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?

Accepted Answer

The thermal paste between the CPU and heatsink has dried out.. 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.

Answer

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

Answer

The CPU is faulty and needs replacement.

Answer

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

Question 3

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?

Accepted Answer

The mainboard audio IC (codec).. 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.

Answer

The charging port flex cable.

Answer

The SIM card slot.

Answer

The battery connector.

Question 4

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?

Accepted Answer

The LCD panel or display ribbon cable is faulty.. 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.

Answer

The battery is completely drained.

Answer

The digitizer is cracked.

Answer

The OS is corrupted.

Question 5

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?

Accepted Answer

The webcam module or motherboard USB controller has failed.. 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.

Answer

The webcam driver is outdated.

Answer

The laptop's BIOS has the webcam disabled.

Answer

The operating system needs to be reinstalled.

Question 6

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?

Accepted Answer

Apply isopropyl alcohol around the battery edges to weaken the adhesive, then gently pry with a plastic spudger.. 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.

Answer

Use a flathead screwdriver to pry the battery out forcefully.

Answer

Heat the battery with a heat gun to soften the adhesive.

Answer

Use a suction cup to pull the battery straight up.

Question 7

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?

Accepted Answer

Reseat or replace the power button flex cable.. 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.

Answer

Replace the LCD screen assembly.

Answer

Replace the motherboard.

Answer

Perform a hard reset by holding the power and volume buttons for 30 seconds.

Question 8

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?

Accepted Answer

Check the backlight voltage or inverter board (if applicable).. 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.

Answer

Replace the LCD panel again, assuming the new one is defective.

Answer

Update the graphics driver from the Windows Recovery Environment.

Answer

Reseat the RAM modules to ensure proper boot.

Question 9

A technician is troubleshooting a smartwatch that will not sync with a smartphone via Bluetooth. The smartwatch pairs but data syncs only intermittently. The smartphone is an Android device with battery optimization enabled for the companion app. What is the most likely cause?

Accepted Answer

The smartphone's battery optimization is preventing the companion app from running in the background.. Battery optimization on Android can kill background processes for apps, preventing the companion app from maintaining a constant Bluetooth connection for syncing. Disabling battery optimization for the app allows it to run continuously, resolving intermittent sync issues.

Answer

The smartwatch firmware is outdated.

Answer

The Bluetooth radio is experiencing interference from other devices.

Answer

The smartwatch's battery is low.

Question 10

A user reports that their NFC-enabled smartphone cannot make contactless payments at a terminal that works with other phones. The user has a thick wallet case with metal credit cards. What is the most likely issue?

Accepted Answer

The wallet case is interfering with the NFC signal.. NFC uses electromagnetic fields; metal objects can block or detune the NFC antenna. A thick case with metal cards can shield the phone's NFC antenna, preventing communication with the payment terminal. Removing the case or isolating the phone from metal usually resolves this.

Answer

The payment terminal's NFC reader is faulty.

Answer

The phone's NFC antenna is damaged.

Answer

The phone's payment app is not configured correctly.

Question 11

A technician is troubleshooting a laptop that cannot connect to a 5 GHz Wi-Fi network, but it connects to 2.4 GHz networks without issue. The laptop's Wi-Fi adapter supports both bands. What is the most likely cause?

Accepted Answer

The laptop is too far from the access point, or there are obstructions blocking the 5 GHz signal.. The 5 GHz band is more susceptible to obstruction and has shorter range. Physical barriers or distance can prevent the laptop from seeing or connecting to the 5 GHz network. Driver or channel issues are also possible but less common.

Answer

The 5 GHz network is using a channel not supported by the laptop's Wi-Fi adapter.

Answer

The laptop's Bluetooth is interfering with the 5 GHz Wi-Fi.

Answer

The 5 GHz network requires WPA3, which the laptop does not support.

Question 12

A company deploys tablets for inventory management. The tablets need to connect to a Bluetooth barcode scanner and also sync data to a cloud server over Wi-Fi. The Bluetooth connection drops every few minutes. What is the most likely cause?

Accepted Answer

Wi-Fi and Bluetooth are interfering because both use the 2.4 GHz band.. Co-channel interference between Bluetooth and Wi-Fi on the 2.4 GHz band is a common issue. If the Wi-Fi network is heavily used, it can disrupt Bluetooth. Changing Wi-Fi to 5 GHz or using Bluetooth 5's enhanced features can help.

Answer

The barcode scanner's battery is low.

Answer

The tablets are too far from the barcode scanner.

Answer

The cloud server is not responding to sync requests.

Question 13

A technician is configuring a kiosk that uses a tablet to display digital signage. The tablet must be powered continuously and connected to a wired network for reliability. The tablet has a single USB-C port. How should the technician provide both power and network connectivity?

Accepted Answer

Connect a USB-C hub that provides both Ethernet and Power Delivery charging.. USB-C supports alternate modes and Power Delivery. A USB-C hub with Ethernet and power passthrough allows simultaneous charging and wired networking. This is a common solution for single-port tablets.

Answer

Use a USB-C to Ethernet adapter and charge the tablet wirelessly.

Answer

Use a Wi-Fi connection and a standard USB-C charger.

Answer

Connect the tablet to the network via Bluetooth tethering to a phone.

Question 14

A technician is troubleshooting a smartphone that cannot establish an NFC connection with a payment terminal. The phone's NFC is enabled, and the screen is unlocked. The payment terminal shows 'No card detected'. Which of the following should the technician check first?

Accepted Answer

The phone's NFC antenna location and alignment with the terminal. NFC requires close proximity and correct orientation; many phones have the NFC antenna located near the top or back. This tests practical knowledge of NFC hardware placement and the need for precise alignment.

Answer

The phone's battery level

Answer

The payment terminal's internet connection

Answer

The phone's default payment app settings

Question 15

A user reports that their laptop's Bluetooth mouse stops working after the laptop wakes from sleep. The mouse works fine after a reboot. The technician suspects a driver issue. Which of the following steps should the technician take to resolve this without disrupting other Bluetooth devices?

Accepted Answer

Disable and re-enable the Bluetooth adapter in Device Manager.. Disabling and re-enabling the Bluetooth adapter in Device Manager resets the Bluetooth stack without a full reboot, often restoring functionality after sleep. This tests advanced troubleshooting of Bluetooth power management issues.

Answer

Uninstall the mouse driver and reboot.

Answer

Change the mouse's Bluetooth pairing to a different channel.

Answer

Update the laptop's BIOS to the latest version.

Question 16

A technician is configuring a kiosk tablet that must connect to a wired Ethernet network for security reasons. The tablet only has a USB-C port. The network drop provides an RJ45 connection. Which of the following should the technician use to achieve a wired connection?

Accepted Answer

USB-C to Ethernet adapter. USB-C to Ethernet adapters are standard and allow wired network connections on devices without Ethernet ports. This tests knowledge of adapter types and the ability to select the correct one for a given port and network interface.

Answer

USB-C to HDMI adapter

Answer

USB-C to USB-A adapter with a USB Ethernet dongle

Answer

USB-C to DisplayPort adapter

Question 17

A technician is troubleshooting a laptop that will not charge via its USB-C port. The laptop uses a USB-C power adapter that works with other devices. The technician tests the port with a known-good USB-C flash drive, and it is not detected. What is the most likely issue?

Accepted Answer

The USB-C port is damaged or has bent pins.. Since the USB-C port fails to detect a flash drive and also does not charge, the port itself is likely damaged. This could be due to bent pins or internal damage. The correct answer is a damaged USB-C port.

Answer

The laptop's battery is completely dead and needs replacement.

Answer

The power adapter is not outputting enough wattage.

Answer

The laptop's BIOS settings have disabled the USB-C port.

Question 18

A user reports that their smartphone's wireless charging pad stops charging after a few minutes, and the phone gets very hot. The phone supports Qi wireless charging. The technician tests the pad with another phone and it works fine. What is the most likely cause?

Accepted Answer

The phone case contains metal or magnetic components that interfere with charging.. Since the charging pad works with another phone, the issue is with the user's phone. A thick case, especially one with metal or magnetic components, can interfere with wireless charging and cause overheating. The correct answer is a case with metal or magnetic parts.

Answer

The phone's battery management system is faulty.

Answer

The phone's wireless charging coil is misaligned with the pad.

Answer

The wireless charging pad is not Qi-certified.

Question 19

A technician is setting up a mobile workstation for a graphic designer who uses a laptop with a USB-C port that supports Thunderbolt 3. The designer needs to connect two 4K monitors, a wired Ethernet connection, and charge the laptop simultaneously. Which accessory should the technician choose?

Accepted Answer

A Thunderbolt 3 docking station. A Thunderbolt 3 docking station provides high bandwidth (40 Gbps) to support dual 4K displays, Ethernet, and power delivery over a single cable. A USB-C hub may not have enough bandwidth for dual 4K output, and a USB-C to HDMI adapter alone cannot provide Ethernet or charging. A KVM switch is for sharing peripherals between computers, not for this purpose.

Answer

A USB-C to dual HDMI adapter

Answer

A USB 3.0 hub with HDMI and Ethernet

Answer

A KVM switch

Question 20

A user complains that their wireless Bluetooth earbuds frequently disconnect during calls when their smartphone is in their pocket. The earbuds work fine when the phone is on a desk. Which accessory or configuration change is most likely to resolve this issue?

Accepted Answer

A Bluetooth neckband style headset. Bluetooth signal can be blocked by the human body, especially when the phone is in a pocket. Using a Bluetooth neckband or headset with an external antenna can improve signal reception. A Bluetooth signal booster or case may help, but a neckband physically positions the receiver closer to the phone. Wi-Fi interference is less likely given the scenario.

Answer

A Bluetooth signal booster app

Answer

A metal phone case

Answer

A Wi-Fi analyzer to change router channels