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Difficulty: MediumLaptop Display Components and Features

A corporate user brings in a laptop following a drop. The display panel shows a clear, bright image, but the integrated webcam is not detected by the operating system and the laptop can no longer discover wireless networks. During inspection of the display assembly, a technician notes that both the webcam cable and Wi-Fi antenna wires pass through the display hinges. Which of the following is the most likely cause of these combined symptoms?

  1. The wiring harness carrying the webcam and antenna leads was pinched or severed inside the hinge assembly.Answer
  2. B
    The backlight inverter board failed, causing integrated auxiliary screen peripherals to lose power.
  3. C
    The graphics processing unit (GPU) experienced a driver crash that disabled connected USB and PCIe devices.
  4. D
    The touchscreen digitizer layer suffered internal cracking, short-circuiting the system bus.

Answer

The cable harness carrying the webcam and Wi-Fi antenna leads was pinched or severed within the hinge assembly.
In modern laptop construction, the upper display housing contains not only the display panel itself but also auxiliary components including the webcam, microphone array, and Wi-Fi/Bluetooth antenna leads. These wires route from the motherboard up into the display lid through the mechanical hinges. A physical drop or severe hinge damage can pinch or sever the wire bundle carrying the camera data lines and antenna cables while leaving the separate video display cable unharmed.

Step-by-Step Solution

1
Analyze reported symptoms and physical structure of laptop display assembly
The display image functions properly, indicating the primary video cable is intact. However, both the integrated webcam and Wi-Fi antennas are non-functional.
Identify which components inside the display enclosure share physical routing paths.
2
Evaluate component wiring paths through the display hinges
Webcam wiring (typically USB bus) and Wi-Fi antenna cables run from the main system board up through the display hinges into the top lid enclosure.
Physical stress or damage to the hinge area often pinches or shears these shared cable bundles.
3
Select the correct diagnostic conclusion
Damage to the cable harness at the hinge directly accounts for losing both webcam detection and Wi-Fi signal simultaneously.
No other display power or rendering component controls both wireless antennas and camera connectivity.

Key Concept

Laptop display assembly component routing and hinge cable management
Estimated Time:1m 15s
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Topics

Laptop Display Components and Features

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