220-1101 Mobile Devices Practice Question
A user's Android smartphone has a cracked screen. The display shows the image correctly, but the touchscreen does not respond anywhere. The technician replaces the screen assembly, but after the repair, the touchscreen still does not work. Which of the following is the MOST likely cause?
⚠ Common exam trap
The trap here is assuming the new screen is defective or that software is at fault, when a simple loose connector is often the culprit.
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
✓
The digitizer connector is not properly seated on the motherboard.
After replacing a screen assembly, if the display works but touch does not, the most likely cause is a loose or improperly connected digitizer cable. The digitizer connector must be firmly seated on the motherboard. A defective screen, OS reinstall, or battery issue are less likely. Reseating the connector is the first troubleshooting step.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The digitizer connector is not properly seated on the motherboard.
Why this is correct
During screen replacement, the digitizer connector must be securely attached to the motherboard. If it is loose or not fully seated, touch functionality will fail even if the display works. This is a common mistake during repairs. Reseating the connector often resolves the issue.
- ✗
The replacement screen is defective.
Why it's wrong here
While a defective replacement is possible, it is less likely if the screen was new and from a reputable source. The fact that the display works but touch does not suggests a connection issue rather than a defective panel. Other causes like a loose connector or software issue are more common.
- ✗
The phone's operating system needs to be reinstalled to recognize the new screen.
Why it's wrong here
Android does not require an OS reinstall after a screen replacement. The hardware is plug-and-play. If the connector is properly attached, the touchscreen should work immediately. Software reinstallation is unnecessary and does not address hardware connection issues.
- ✗
The battery is not providing enough power to the touchscreen.
Why it's wrong here
The touchscreen is powered by the phone's main power system, and if the display works, the battery is providing sufficient power. A battery issue would likely affect the entire phone, not just the touchscreen. This is not a plausible cause for touch failure after a screen replacement.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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.