220-1201 Practice Question: A technician is troubleshooting a tablet that has…

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 is malfunctioning.

  Why it's wrong here

  The digitizer is responsible for detecting touch input and translating it into signals for the operating system. A malfunction in this component would typically result in unresponsive touch, inaccurate touch registration, or ghost touches, making it difficult or impossible to interact with the tablet via touch. Since the problem described is dimness and flickering of the display while touch response remains normal, a digitizer issue is not indicated.

• ✗

  The LCD panel has dead pixels.

  Why it's wrong here

  Dead pixels are individual sub-pixels or entire pixels that are permanently stuck in an 'off' state, appearing as small, fixed black or colored dots on the screen. While they are a display defect, they only affect specific, localized areas and do not cause the entire screen to become dim, flicker, or exhibit uniform brightness issues. The described symptom of overall dimness and flickering across the entire display is inconsistent with the isolated nature of dead pixels.

• ✓

  The backlight LED or inverter is failing.

  Why this is correct

  The backlight LED array or its associated inverter/driver circuit is crucial for illuminating the liquid crystal display (LCD) panel, as LCDs do not produce their own light. When this component begins to fail, it commonly manifests as a dim screen, noticeable flickering, or intermittent display output because the illumination source is unstable or insufficient. Since the operating system and touch functionality are reported as normal, the issue is isolated to the display's illumination system rather than its data processing or input.

• ✗

  The motherboard GPU is damaged.

  Why it's wrong here

  The motherboard's Graphics Processing Unit (GPU) is responsible for rendering all visual output and sending it to the display panel. Damage to the GPU typically results in severe graphical anomalies such as distorted images, corrupted colors, artifacts (e.g., lines, blocks, or strange patterns), or a complete lack of display output. Simple dimness or flickering without any other visual corruption or system instability suggests that the GPU is still processing and sending correct video data, making its failure an unlikely cause.

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