Chapter 1. Monitoring, Maintaining, and Replacing Mobile Device Hardware

What is the purpose of the Fn key on a laptop keyboard?

To activate secondary functions of other keys.
Explanation: Laptop manufacturers use the Fn key with F1–F12 keys to control features such as Wi-Fi, brightness, touchpad, and external displays.

A user reports that typing letters produces numbers instead. What is the most likely cause?

Num Lock is enabled.
Explanation: Many laptops share number keys with letters, and enabling Num Lock changes their function.

A laptop keyboard has keys that do not work after a liquid spill. What is a likely solution?

Clean the affected key switch or replace the keyboard.
Explanation: Liquid damage can cause stuck or failed keys.

A laptop keyboard stops working after being moved frequently. What should a technician check?

The keyboard ribbon cable connection.
Explanation: Movement can loosen the cable connecting the keyboard to the motherboard.

Before replacing a laptop keyboard, what safety precaution should a technician take?

Disconnect power and battery, and use ESD protection.
Explanation: Removing power and preventing electrostatic discharge protects the laptop components.

What temporary solution can be used if a laptop keyboard fails?

Connect a USB or wireless keyboard.
Explanation: External keyboards allow users to continue working until repair.

What built-in pointing device is commonly found on laptops?

A touchpad.
Explanation: Laptops typically use touchpads instead of external mice.

A laptop cursor moves randomly while typing. What is a possible cause?

Accidental touchpad input or a touchpad driver issue.
Explanation: Hands, sleeves, Bluetooth devices, or incorrect drivers can cause pointer drift.

What type of RAM is used in laptops?

SODIMM.
Explanation: Laptops use smaller memory modules than desktop computers.

How many pins does DDR4 SODIMM memory have?

260 pins.
Explanation: DDR4 and DDR5 SODIMMs have different pin layouts.

How many pins does DDR5 SODIMM memory have?

262 pins.
Explanation: DDR5 SODIMM is not compatible with DDR4 slots.

Can DDR4 and DDR5 SODIMM memory be used interchangeably?

No.
Explanation: Different SODIMM generations use different pin layouts and are incompatible.

What should a technician check before installing laptop RAM?

RAM compatibility with the laptop.
Explanation: The laptop documentation determines supported memory type and capacity.

A laptop does not detect newly installed RAM. What should the technician do?

Reseat the RAM module.
Explanation: Improper installation is a common cause of memory detection problems.

A laptop repeatedly beeps during startup after a RAM upgrade. What is a possible cause?

Faulty or improperly installed RAM.
Explanation: Memory problems can prevent booting and trigger error beeps.

What type of storage drive has no moving parts and uses flash memory?

SSD.
Explanation: SSDs are faster, quieter, and more durable than mechanical drives.

What type of storage drive uses spinning disks and a read/write head?

HDD (magnetic disk).
Explanation: HDDs use mechanical components to store data.

What type of storage combines an HDD with SSD cache?

Hybrid drive.
Explanation: Hybrid drives combine HDD capacity with SSD performance benefits.

What are common laptop storage drive form factors?

2.5-inch, 1.8-inch, and M.2.
Explanation: These are common physical sizes used in laptops.

A technician wants to improve an older laptop's performance. What storage upgrade should they consider?

Replace an HDD with an SSD.
Explanation: SSDs provide faster performance and improved efficiency.

Why should technicians be careful when installing M.2 drives in laptops?

They can generate significant heat.
Explanation: Laptop environments have limited cooling space.

What internal cards are commonly used for laptop wireless communication?

M.2 or Mini PCIe cards.
Explanation: These cards provide Wi-Fi and Bluetooth connectivity.

A laptop cannot connect to Wi-Fi, but Windows shows Wi-Fi enabled. What should the technician check?

The physical Wi-Fi button or function key.
Explanation: Hardware wireless switches can disable Wi-Fi independently of the operating system.

What wireless technologies are commonly found in laptops?

Wi-Fi, Bluetooth, and cellular WAN.
Explanation: These allow laptops to connect to networks and wireless devices.

What type of network does Bluetooth create?

PAN (Personal Area Network).
Explanation: Bluetooth connects nearby devices over short distances.

A laptop's Wi-Fi and Bluetooth connections interfere with each other. What is a possible cause?

Both are using the 2.4 GHz frequency.
Explanation: Wi-Fi and Bluetooth can compete for the same frequency range.

What should a technician do when installing a laptop wireless card?

Connect the antenna cables correctly and secure the card.
Explanation: Incorrect antenna connections can reduce wireless performance.

What are the two common laptop wireless card form factors?

M.2 and Mini PCIe.
Explanation: These are commonly used internal wireless adapter formats.

Where is a laptop webcam usually located?

Above the display in the bezel area.
Explanation: Laptop webcams are normally installed near the top of the screen.

A webcam is not working. What should a technician check before replacing it?

Whether it is disabled through the OS or function key.
Explanation: Software settings can disable webcams without hardware failure.

Where is the microphone commonly located in a laptop?

Integrated into the webcam module.
Explanation: Many laptops combine the webcam and microphone assembly.

What is the purpose of a laptop Wi-Fi antenna?

To transmit and receive wireless signals.
Explanation: Antennas allow the laptop wireless adapter to communicate.

What connector types are commonly used for internal laptop Wi-Fi cards?

M.2 and Mini PCIe.
Explanation: These cards connect internally to the motherboard.

What is the purpose of a MAC address on a Wi-Fi adapter?

To uniquely identify the network adapter.
Explanation: Every network adapter has a unique physical address.

How long is a MAC address?

48 bits.
Explanation: MAC addresses are represented in hexadecimal format.

What command displays the MAC address of a network adapter in Windows?

ipconfig /all.
Explanation: This command shows network configuration details including physical addresses.

What physical security device is used to secure laptops to desks?

Cable lock.
Explanation: Cable locks physically attach laptops to prevent theft.

What is biometric authentication?

Using physical characteristics such as fingerprints or facial recognition to verify identity.
Explanation: Biometrics provides an additional method of authentication.

What is multifactor authentication (MFA)?

Using two or more authentication factors to verify identity.
Explanation: MFA improves security by requiring multiple forms of verification.

A company wants stronger laptop security using fingerprints. What technology should they use?

Biometrics with MFA.
Explanation: Fingerprints add an additional authentication factor beyond passwords.

What is NFC used for?

Short-range wireless communication between devices.
Explanation: NFC allows nearby devices to exchange information.

Why might an organization disable NFC on laptops?

Because it can create a security risk.
Explanation: Attackers may attempt to access data using NFC scanners or apps.

How can NFC be disabled on a laptop?

Disable it in the operating system or enable airplane mode.
Explanation: Airplane mode disables wireless transmissions including NFC.

A laptop is stolen from an office. What physical security measure could have reduced the risk?

A cable lock.
Explanation: Cable locks physically secure laptops to fixed objects.

Why should a company not rely only on one security measure?

Any security method can eventually be bypassed.
Explanation: Multiple security controls provide stronger protection.