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Difficulty: EasyMobile Device Hardware and Display Issues

A technician is inspecting a user's corporate smartphone after the user reports that the screen is lifting away from the frame and touch input near the bottom of the screen has become unreliable. Upon visual inspection, the display glass appears slightly convex and pushed outward from inside the chassis. Which of the following is the most likely cause of this issue?

  1. A
    The display's backlight inverter board has overheated and expanded.
  2. The lithium-ion battery has swollen due to gas buildup and must be replaced.Answer
  3. C
    The battery requires a full deep discharge cycle to reset its physical cell calibration.
  4. D
    The IMSI identifier has corrupted the touchscreen digitizer controller.

Answer

A swollen lithium-ion battery has expanded due to internal gas buildup, applying physical pressure that lifts the display panel from the smartphone chassis.
A swollen lithium-ion battery releases gas inside its sealed pouch when damaged or degraded, exerting mechanical force that lifts the display assembly away from the chassis.

Step-by-Step Solution

1
Analyze the physical symptoms reported
The screen is physically lifting out of the chassis and glass is convex, indicating internal mechanical pressure originating beneath the screen.
Physical bulging behind a smartphone screen is characteristic of an expanding lithium-ion battery.
2
Identify the component responsible for internal expansion
Lithium-ion batteries generate gas when compromised by degradation or overcharging, causing severe swelling.
Swollen batteries present a potential fire hazard and must be safely handled and replaced.

Key Concept

Mobile device battery swelling symptoms and safety handling
Estimated Time:45s
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Topics

Mobile Device Hardware and Display Issues

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