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Difficulty: EasyMobile Device Hardware and Display Issues

A technician is troubleshooting a laptop whose built-in screen remains completely dark after booting, even though the power status LED is illuminated and an attached external monitor displays the operating system normally. Which of the following components should the technician inspect or test as the most likely causes of this issue? (Select TWO.)

  1. The internal video display cable connectionAnswer
  2. The display panel backlight assemblyAnswer
  3. C
    The laptop OLED inverter board component
  4. D
    The system memory full-size DIMM module

Answer

The most likely components causing the internal display failure are the internal video display cable connection and the display panel backlight assembly.
Because an external monitor displays the desktop correctly, the core system components (GPU, motherboard, CPU, RAM) are fully operational. The fault must reside within the laptop's internal display assembly—specifically a loose or broken internal video ribbon cable or a failed screen backlight mechanism.

Step-by-Step Solution

1
Analyze the diagnostic findings
The external monitor displays video correctly, which confirms the GPU, system RAM, motherboard, and operating system are operating normally.
Isolating the issue to hardware specific to the built-in laptop screen panel assembly.
2
Identify potential hardware points of failure for the built-in display
Either the display ribbon cable routing video signals to the panel is disconnected/damaged, or the screen's backlight system has failed.
These two components specifically affect internal screen output without disrupting external display output.

Key Concept

Troubleshooting internal laptop display failures using external display verification
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Topics

Mobile Device Hardware and Display Issues

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