220-1101 Mobile Devices Practice Question
A user reports that their smartphone's camera app crashes whenever they attempt to take a photo with the flash enabled. The camera works normally without flash, and the flashlight app functions correctly. Which of the following components is MOST likely faulty?
⚠ Common exam trap
Watch out — candidates often assume a working flashlight app means the flash LED is fully functional, overlooking that the camera module's dedicated flash control circuitry can be faulty even when the LED itself is fine.
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
✓
Camera module
The camera module is the most likely faulty component because it contains the flash LED driver circuitry that synchronizes the flash with the camera sensor. When the flash is enabled, the camera module must coordinate the LED pulse with the image capture; a failure in this integrated circuit causes the app to crash, even though the standalone flashlight app works by bypassing the camera's synchronization logic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Camera module
Why this is correct
The camera module integrates the image sensor, autofocus actuator, and the flash control circuitry used exclusively by the camera app for stills/video. When the app attempts to initiate flash, it commands the module to charge/trigger the LED in a timed sequence; a faulty flash driver or sensor logic inside the module can send back an error state that crashes the camera process. The flashlight app bypasses this photo-specific control path, so the module can still be bad even though the LED physically lights up.
- ✗
Flash LED
Why it's wrong here
The Flash LED is only a current-driven light source; it is proven working because the flashlight app turns it on without issue. In camera use, the LED is triggered by the camera module's flash driver circuit, which handles pre-flash metering and synchronization. Because the LED itself responds to a simple direct current command, a failure in the LED would also break the flashlight function, making it an unlikely cause of a camera-app-specific crash.
- ✗
Motherboard
Why it's wrong here
A faulty motherboard would present as broad, multi-subsystem symptoms—erratic boot loops, random shutdowns, touch input failures, or crashes across many unrelated applications. A crash that occurs only when the camera app invokes flash indicates a peripheral fault along the camera interface, not a systemic board failure. Motherboard repair is a last resort after isolating the camera module and its flex cable.
- ✗
Battery
Why it's wrong here
Battery problems typically manifest as rapid discharge, overheating, unexpected power-off under load, or the device failing to boot; a weak battery could even restart the phone when high current is drawn. However, a reproducible crash at the moment the camera flash fires—while other apps continue working—does not match the energy-delivery symptom pattern. If voltage sag were the cause, you would see full-device resets or wide app instability, not a clean error in just the camera process.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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