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Difficulty: EasyMobile Device Hardware and Display Issues

Match each mobile device symptom on the left with its most likely underlying hardware cause on the right.

  • A laptop LCD screen remains dark, but a faint image is visible under a bright light source.Failed backlight inverter or illumination circuit
  • A smartphone screen glass is visibly expanding and lifting outward from the device frame.Swollen lithium-ion battery accumulating gas
  • A tablet display shows a clear picture, but fails to respond to any finger touch inputs.Damaged digitizer layer
  • A mobile device loses cellular service authentication immediately following a SIM card swap.Unreadable or mismatched IMSI configuration

Answer

The correct matches associate the dark display with a faint image to a failed backlight inverter, screen lifting to a swollen battery, touch unresponsiveness with a clear image to a damaged digitizer, and post-SIM swap cellular authentication failure to an IMSI read error.
Each symptom directly corresponds to a specific hardware or provision failure. Dim images indicate missing backlighting. Screen lifting stems from swelling lithium-ion batteries. Non-responsive touch with clear visual output indicates digitizer failure. Cellular network access drops following SIM insertion indicate IMSI verification failures.

Step-by-Step Solution

1
Analyze the dark LCD screen with faint image symptom
Identify that the LCD panel is rendering graphics but lacking illumination.
Faint images under external light point directly to a failed backlight or inverter circuit.
2
Analyze the screen lifting outward symptom
Identify internal pressure caused by battery degradation.
Lithium-ion batteries swell as gas builds up inside failing cells, applying physical force to the display assembly.
3
Analyze the touch failure with normal display image symptom
Isolate the issue to the touch-sensing layer.
The digitizer translates physical touches into data signals independently of the visual display output.
4
Analyze the cellular network registration drop after SIM swap
Identify subscriber identity read failures.
The IMSI provisions subscriber access to the network; if the SIM card cannot be read, network authentication fails.

Key Concept

Mobile Device Hardware & Display Troubleshooting
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Topics

Mobile Device Hardware and Display Issues

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