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Difficulty: HardLaptop Display Components and Features

A technician completes a screen replacement on a user's laptop. After reassembly, the user reports two persistent issues: wireless network connectivity is extremely weak with frequent dropped connections, and the display periodically flickers or cuts out entirely whenever the laptop lid is tilted or moved. Which TWO of the following underlying hardware causes are most likely responsible for these symptoms? (Select TWO.)

  1. The Wi-Fi antenna harness cables routed through the display hinge are pinched or partially disconnected.Answer
  2. The main video ribbon cable passing through the display hinge is damaged or improperly seated in the motherboard connector.Answer
  3. C
    The OLED backlight inverter board was installed upside down during the bezel reassembly process.
  4. D
    The touchscreen digitizer driver was deleted during the physical LCD panel swap.
  5. E
    The high-voltage CCFL power rail is drawing excess current from the wireless network interface card.

Answer

The correct answers are that the Wi-Fi antenna harness cables routed through the display hinge are pinched or partially disconnected, and the main video ribbon cable passing through the display hinge is damaged or improperly seated.
In modern laptop display assemblies, both the main display video cable (eDP/LVDS) and the wireless antenna wires are routed through the mechanical display hinges into the upper lid housing. If these cables are pinched, misrouted, or inadequately seated during a screen replacement, adjusting the lid position will flex the damaged video cable (causing screen flickering or power loss) and degrade antenna signal reception.

Step-by-Step Solution

1
Analyze the reported Wi-Fi connectivity symptom.
Recognize that laptop Wi-Fi antenna leads run from the internal wireless card up into the top lid assembly via the display hinges.
Improper routing or pinching of antenna wires during screen replacement directly impairs signal reception.
2
Analyze the intermittent video flickering symptom when moving the lid.
Identify that the video ribbon cable traverses the display hinge to connect the motherboard to the LCD panel.
Physical movement causing intermittent display loss indicates a loose connection or damaged conductors inside the flex cable at the hinge pivot point.
3
Evaluate and rule out distractor options.
Eliminate inverter options and driver deletion misconceptions.
OLED displays do not utilize inverters, software drivers are unaffected by hardware replacement, and CCFL power rails do not draw power from Wi-Fi cards.

Key Concept

Laptop Display Assembly Wire Routing and Component Functionality
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Topics

Laptop Display Components and Features

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