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Difficulty: MediumMobile Device Hardware and Display Issues

A technician is troubleshooting a mobile laptop with a cold cathode fluorescent lamp (CCFL) backlit LCD screen. The user reports two distinct problems: the screen image has become extremely dim and is only readable when a flashlight is aimed directly at the display, and the bottom casing of the device is bulging near the touchpad. Which of the following actions should the technician perform to address these issues? (Select TWO.)

  1. Replace the display backlight inverter board.Answer
  2. Safely remove and replace the swollen lithium-ion battery.Answer
  3. C
    Perform a complete deep discharge and recharge cycle on the battery.
  4. D
    Install an OLED high-voltage inverter module onto the panel ribbon assembly.

Answer

The technician should replace the display backlight inverter board and safely remove and replace the swollen lithium-ion battery.
Replacing the display backlight inverter board restores power to the CCFL bulb so the LCD screen is illuminated. Safely removing and replacing the swollen battery resolves the physical bulging issue and mitigates safety risks associated with degraded lithium-ion cells.

Step-by-Step Solution

1
Diagnose the faint display symptom.
Confirm that the LCD liquid crystal matrix is rendering images by shining an external light on it, proving that the LCD panel itself works but lacks illumination from the CCFL backlight inverter.
On CCFL-backlit laptops, the inverter board converts DC power to AC power for the backlight bulb. A blown inverter results in a very dark image.
2
Diagnose the swollen chassis symptom.
Identify physical distortion of the casing around the battery bay as battery swelling.
Li-ion batteries accumulate gas and swell when damaged or aged, necessitating immediate replacement and safe disposal.

Key Concept

Mobile device hardware troubleshooting for display illumination failure and battery swelling.
Estimated Time:1m 30s
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Topics

Mobile Device Hardware and Display Issues

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