220-1101 Mobile Devices Practice Question
A user reports that their iPhone will not charge when plugged into a charger. The technician examines the Lightning port and notices that there is visible debris inside the port. The technician has tried different charging cables and power adapters, all of which work with other iPhones. Which of the following is the BEST next step to resolve the issue?
⚠ Common exam trap
CompTIA often tests the candidate's ability to distinguish between hardware-level physical issues and software-level logical issues, and the trap here is that candidates may jump to a software fix (like an update or reset) when the symptom is clearly caused by a physical obstruction.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use compressed air to blow out the debris.
The visible debris in the Lightning port is physically obstructing the connection between the cable and the port's pins. Since the technician has already verified that the cables and adapters work with other iPhones, the issue is isolated to the port itself. Using compressed air is the safest and most effective first step to dislodge debris without damaging the delicate internal components.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Replace the charging port assembly.
Why it's wrong here
Replacing the charging port assembly is a drastic, irreversible hardware repair that should only be attempted after all non-destructive cleaning methods have failed. The issue is often simply a compacted layer of lint or pocket debris, which does not require disassembling the device. Moreover, replacing the Lightning port involves soldering or proprietary connectors, risking further damage to the logic board if performed incorrectly.
- ✓
Use compressed air to blow out the debris.
Why this is correct
Compressed air is the correct first-line treatment because the Lightning port is a recessed receptacle where microscopic lint and dust naturally accumulate over time, preventing the cable from seating fully. A short, angled burst of compressed air safely dislodges this debris without contacting the fragile gold pins. Avoid using metal probes or paperclips, as they can short the power pins or scratch the internal contacts. Ensure the can is held upright to prevent any propellant from spraying into the port.
- ✗
Update the iOS to the latest version.
Why it's wrong here
Updating iOS to the latest version is irrelevant to a physical charging failure because the issue lies in the mechanical connection between the port and the cable, not in software logic. Firmware updates can adjust battery charge curves or address battery health reporting, but they cannot clear a blocked connector. Consequently, this step wastes time and does not move the user any closer to restoring the ability to charge.
- ✗
Perform a factory reset on the iPhone.
Why it's wrong here
A factory reset erases all user data and restores the system to its original state, but it has absolutely no effect on the physical obstruction inside the charging port. The reset process recalls system software and settings, not hardware structures, so the port remains equally blocked afterward. Beyond being useless for this problem, it is actively harmful because the owner loses photos, messages, and app data without any possibility of reviving the charge.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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