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Difficulty: MediumMobile Device Hardware and Display Issues

A user reports that the glass display assembly on their corporate smartphone is physically lifting away from the aluminum chassis along the left edge. Although the display screen still outputs a clear image, the touchscreen digitizer has become intermittently unresponsive in the affected area. Which of the following is the most likely root cause of this hardware issue?

  1. A swollen lithium-ion battery pushing against the display assembly from within the casingAnswer
  2. B
    A failing backlight inverter board overheating and warping the display bezel frame
  3. C
    A battery calibration error that requires a full deep-discharge cycle to restore normal component seating
  4. D
    A mismatched IMSI hardware profile causing localized electrical bus timing failures on the digitizer interface

Answer

A swollen lithium-ion battery pushing against the display assembly from within the casing
The correct answer identifies a swollen lithium-ion battery as the root cause. When lithium-ion batteries degrade or suffer thermal stress, gas accumulates within the battery casing, causing it to swell significantly. In compact mobile devices like smartphones and tablets, this expansion pushes directly against the back of the screen assembly, causing the glass to pop or lift away from the frame and putting mechanical strain on the touch digitizer.

Step-by-Step Solution

1
Analyze the physical symptoms reported
The screen is physically separating/lifting from the frame, and digitizer touch sensitivity is impacted despite the display output remaining functional.
Physical separation indicates internal volumetric pressure inside the sealed mobile device chassis.
2
Identify internal mobile components capable of swelling or expanding
Lithium-ion polymer batteries accumulate gas and swell when degraded, overcharged, or exposed to excessive heat.
No other mobile hardware component expands in volume inside the enclosure to push the display outwards.
3
Select the correct root cause and safety hazard mitigation
Recognize battery swelling as the cause, requiring safe battery replacement and handling procedures.
Replacing the swollen battery relieves physical pressure on the display and restores normal screen seating.

Key Concept

Mobile Device Battery Swelling and Screen Separation
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Topics

Mobile Device Hardware and Display Issues

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