FC0-U71 Infrastructure Practice Question
A user complains that their laptop's built-in display is very dim and difficult to read, even when the brightness is set to maximum. The laptop is five years old and has never had any hardware replaced. Which component is most likely failing?
⚠ Common exam trap
The trap here is assuming any display issue is caused by the video card, but gradual dimming points to backlight degradation.
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
✓
Backlight
The backlight is responsible for illuminating the LCD panel. In an aging laptop, the backlight can lose brightness over time, resulting in a dim display even at maximum brightness. The other components would produce different symptoms, such as no backlight, touch issues, or image distortion. Therefore, the backlight is the most likely failing component.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Backlight
Why this is correct
The backlight provides illumination for the LCD screen. Over time, backlights can degrade, especially in older laptops, leading to reduced brightness even at maximum settings. Since the laptop is five years old and the display is uniformly dim, a failing backlight is the most probable cause. Replacing the backlight or the entire display assembly would resolve the issue.
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Digitizer
Why it's wrong here
The digitizer is the touch-sensitive layer on a touchscreen laptop. It converts touch input into digital signals. A failing digitizer would cause touch functionality to stop working or become erratic, not affect screen brightness. Since the issue is dimness, the digitizer is not the likely culprit.
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Inverter
Why it's wrong here
The inverter is responsible for providing high voltage to the backlight in older CCFL displays. If it fails, the screen would typically be completely dark, not just dim. Since the user can still see the display but it is dim, the inverter is likely still functioning, though it could be a factor in some cases. However, a failing inverter usually causes no backlight at all.
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Video card
Why it's wrong here
A failing video card or GPU typically causes artifacts, distorted images, or no display at all, rather than a uniformly dim screen. While GPU issues can sometimes affect brightness control, the symptom of gradual dimming over years is more consistent with backlight degradation. The video card is less likely to be the cause here.
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Courseiva writes every FC0-U71 question from scratch — 988 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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 FC0-U71 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 FC0-U71 exam.