220-1101 Mobile Devices Practice Question
A user's Android smartphone screen is flickering intermittently and occasionally goes black for a few seconds before returning. The phone has not been dropped or exposed to moisture. The technician has performed a factory reset, but the issue persists. Which component is the MOST likely cause of the problem?
⚠ Common exam trap
CompTIA often tests the distinction between the digitizer and the display assembly, trapping candidates who assume any screen issue must involve the digitizer because it is the most commonly replaced component in phone repairs.
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
✓
Display assembly
The display assembly includes both the LCD panel and the digitizer. Since the issue persists after a factory reset, it is hardware-related. Intermittent flickering and blackouts without physical damage or moisture point to a failing LCD panel or loose internal connection within the display assembly, not the digitizer (which handles touch input only).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Digitizer
Why it's wrong here
The digitizer is a transparent capacitive layer that detects touch input, converting finger position into electrical signals for the processor. It does not generate or control the visual image on the screen. A failing digitizer would cause unregistered touches, phantom touches, or touch calibration errors—not intermittent flickering or blackouts. Because flickering is a visual output problem, the fault lies in the display assembly, not the touch-sensing layer.
When this WOULD be correct
A question describing a phone that has no display but touch input still works (e.g., screen is black but phone vibrates on touch) would point to a failed digitizer.
- ✓
Display assembly
Why this is correct
Correct. The display assembly includes the LCD/OLED panel and the backlight. A hardware fault in this component is the most likely cause of screen flickering and blackouts, especially since a factory reset did not fix it.
- ✗
Battery
Why it's wrong here
The battery supplies stable DC power to the entire device, and a failing battery typically causes system-wide power instability such as rapid draining, random shutdowns, or failure to charge. If the battery were intermittently dropping voltage, the phone would likely reboot or turn off entirely, not just flicker the screen while remaining powered on. Additionally, other components would show symptoms like app crashes or an unresponsive UI. Since the phone otherwise operates normally, the flickering points to a localized display hardware fault, not a power delivery issue.
When this WOULD be correct
A user reports the phone randomly powers off even with sufficient charge, or the battery swells and deforms the case. The technician finds the battery voltage drops under load. In that scenario, the battery is the most likely cause.
- ✗
Motherboard
Why it's wrong here
While a motherboard failure can cause various issues, it would likely affect more than just the display, such as random reboots, unresponsive functions, or boot failures. Isolated screen flickering points more directly to the display assembly.
When this WOULD be correct
If the phone fails to power on, shows no signs of life, or experiences random reboots and boot loops after a factory reset, the motherboard would be the most likely cause, especially if other components like battery and display have been ruled out.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 220-1101 exam frequently reuses these exact scenarios with slightly different constraints.
✓Display assemblyCorrect answer▾
Why this is correct
Correct. The display assembly includes the LCD/OLED panel and the backlight. A hardware fault in this component is the most likely cause of screen flickering and blackouts, especially since a factory reset did not fix it.
✗DigitizerWrong answer — click to see why▾
Why this is wrong here
The digitizer is the touch-sensitive layer; a flickering or black screen indicates a display issue, not touch input failure. Factory reset would not fix a hardware display problem.
★ When this WOULD be the correct answer
A question describing a phone that has no display but touch input still works (e.g., screen is black but phone vibrates on touch) would point to a failed digitizer.
Why candidates choose this
Candidates confuse 'digitizer' with the entire screen assembly, or assume touch issues cause visual flickering due to loose connections.
✗BatteryWrong answer — click to see why▾
Why this is wrong here
A failing battery typically causes sudden shutdowns, swelling, or charging issues, not intermittent screen flickering or blackouts that resolve on their own. The factory reset would not affect battery-related display problems.
★ When this WOULD be the correct answer
A user reports the phone randomly powers off even with sufficient charge, or the battery swells and deforms the case. The technician finds the battery voltage drops under load. In that scenario, the battery is the most likely cause.
Why candidates choose this
Candidates may associate any intermittent power-related symptom with the battery, not realizing that display assembly issues can cause flickering without power loss.
✗MotherboardWrong answer — click to see why▾
Why this is wrong here
A motherboard failure typically causes complete system failure, boot loops, or random reboots, not intermittent screen flickering that resolves after a few seconds. The factory reset would not fix hardware issues, but the specific symptom of flickering points to the display assembly, not the motherboard.
★ When this WOULD be the correct answer
If the phone fails to power on, shows no signs of life, or experiences random reboots and boot loops after a factory reset, the motherboard would be the most likely cause, especially if other components like battery and display have been ruled out.
Why candidates choose this
Candidates may assume that any persistent hardware issue after a factory reset must be a major component like the motherboard, overlooking that the display assembly is a separate replaceable part with its own failure modes.
Analysis generated from the official 220-1101blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1101 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1101 exam.