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A+ Core 1 · CompTIA 220-1201 V15 · Objective 1.1

Given a scenario, monitor mobile device hardware and use appropriate replacement techniques

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Objective 1.1: Given a scenario, monitor mobile device hardware and use appropriate replacement techniques

Cert: CompTIA A+ Core 1 (220-1201) V15 Domain: 1.0 Mobile Devices Weight: ~13% of Core 1 Depth: Given a scenario, monitor and replace. The candidate must identify components and apply correct replacement procedures.

What this objective tests

You should be able to identify and replace mobile device internal components (battery, keyboard, RAM, storage, wireless cards, antennas, camera, microphone) and recognize the physical privacy and security hardware in modern laptops and phones (biometric sensors, near-field scanners).

This is mostly about laptop hardware service. Phones and tablets are touched here too but their service is far more glued and integrated than laptops.

Key facts

Battery:

  • Laptop and phone batteries are lithium-ion or lithium-polymer. They lose capacity over time as they cycle.
  • Swelling batteries are a safety risk. A swollen laptop battery can push up on the trackpad or keyboard and cause the case to bulge. Replace immediately. Never puncture a swollen battery.
  • Modern laptops increasingly use internal (non-user-replaceable) batteries that require opening the chassis.

Keyboard/keys:

  • Most laptop keyboards are field-replaceable as a single unit, sometimes from underneath via a service panel and sometimes only after removing the entire top deck.
  • Individual key replacements (the keycap and underlying butterfly or scissor mechanism) are common on premium laptops where full keyboard replacements are expensive.
  • Phones generally do not have hardware keyboards.

RAM:

  • Laptops use SODIMM (see 3.3). Some laptops have user-accessible RAM slots; many newer ultrabooks have RAM soldered to the motherboard with no upgrade path.
  • Always check the laptop's service manual before quoting a memory upgrade. Soldered RAM means motherboard replacement to change capacity.

HDD/SSD:

  • Same form factors as desktops (2.5-inch SATA, M.2 NVMe) but smaller drive bays.
  • Many modern laptops use M.2 NVMe SSDs soldered or socketed. Some still have 2.5-inch bays. Check before quoting an upgrade.

Wireless cards:

  • Internal Wi-Fi/Bluetooth modules. Often in M.2 2230 slots in laptops.
  • Some laptops have the Wi-Fi card soldered to the motherboard. Most still allow card replacement.
  • Replacing a Wi-Fi card often improves coverage and speed (Wi-Fi 6E or Wi-Fi 7 upgrades on a few-year-old laptop).

Physical privacy and security components:

  • Biometrics. Fingerprint readers (built into power buttons or trackpads) and face-recognition cameras (Windows Hello IR cameras). Required hardware for Windows Hello signing on Windows 11.
  • Near-field scanner. NFC reader for tap-to-pair or contactless authentication. Common in business laptops and most phones.

Wi-Fi antenna connector/placement:

  • Laptop Wi-Fi antennas usually run through the lid (better signal placement above the screen).
  • Tiny coaxial connectors (U.FL or MHF4) plug into the Wi-Fi card. Easy to dislodge during service. Verify both antennas are connected after any chassis disassembly.
  • Phones embed antennas in the chassis structure. Damaged phone antennas usually mean motherboard or chassis-level service.

Camera/webcam:

  • Embedded module in the laptop lid or phone bezel. Connected by a thin ribbon cable.
  • Webcam failures are often cable disconnection rather than module death. Reseating the cable inside the lid hinge area often fixes it.

Microphone:

  • Built into the laptop chassis or display bezel. Phones have multiple microphones (call, recording, noise canceling).

Common gotchas

  • Disconnected Wi-Fi antennas after service. A laptop comes back from any internal service with one or both antennas not reconnected. Signal drops dramatically. Always verify both antennas are seated.
  • Soldered RAM upgrade promises. Quoting a RAM upgrade on a laptop that has soldered RAM. Always check before promising.
  • Battery age vs hardware failure. A 5-year-old laptop with poor battery life is usually a tired battery, not a failed system. Replace and reset expectations.
  • Swollen battery ignored. Customers sometimes report a "puffy" laptop. Service immediately. Continuing to use a swollen lithium battery is a fire risk.
  • Removing screws in the wrong order. Many laptops use screws of different lengths in similar-looking holes. A wrong-length screw in the wrong hole damages internal components. Use a magnetic mat with labeled positions when disassembling.
  • Biometric data binding to TPM. Fingerprint and face data may be sealed to the TPM. Replacing the motherboard sometimes invalidates the user's biometric enrollments.

Real-world context

For helpdesk and field repair, common requests:

  • "Laptop battery does not last like it used to." Run a battery health report (Windows: powercfg /batteryreport). Replace battery if capacity below 50-60% of design.
  • "Webcam is not working on the work laptop." Check Privacy settings first (camera permission for the app). Then check Device Manager. Hardware failure last.
  • "Laptop Wi-Fi is way slower than it used to be." Could be a disconnected antenna from prior service, a failing card, or a router-side issue.
  • "Customer's phone face-unlock stopped working after a screen replacement." Often the IR sensor cable was not reseated. Phones have very tight component integration; aftermarket repair shops sometimes break biometric calibration.

Procurement guidance for business fleets: prefer laptops with upgradeable RAM and SSD slots, removable batteries where possible, and IR cameras for Windows Hello. Soldered everything is fine for ultraportable executives but limits IT's ability to extend a device's life.

Sources

  • [CompTIA A+ 220-1201 Exam Objectives Version 4.0, Section 1.1](../../../../../../30-RevyTechJourney/CompTIA%20A%2B%20220-1201%20Exam%20Objectives%20%284.0%29.pdf)
  • [Wikipedia: Lithium-ion battery](https://en.wikipedia.org/wiki/Lithium-ion_battery)
  • [Wikipedia: M.2](https://en.wikipedia.org/wiki/M.2)
  • [Wikipedia: Windows Hello](https://en.wikipedia.org/wiki/Windows_Hello)
  • [Microsoft Learn: Windows Hello biometrics](https://learn.microsoft.com/en-us/windows-hardware/design/device-experiences/windows-hello)