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Zorluk: OrtaDisplay Cables and Connectors

An IT technician is connecting a workstation with a newly installed dedicated graphics card to an older projector that only accepts a VGA (DB-15) input. The workstation's graphics card provides only a DVI-D output port. The technician connects the display using a passive DVI-to-VGA adapter, but the projector displays a 'No Signal' message upon powering on. Which of the following best explains why this connection failed?

  1. DVI-D ports output digital signals only and lack the analog pinouts required for a passive VGA adapter to function.Cevap
  2. B
    Passive DVI adapters cannot support the single-link bandwidth required by DB-15 video signals without external power.
  3. C
    The passive DVI connector requires host driver negotiation via DisplayPort Alt Mode to transmit analog video signals.
  4. D
    VGA projectors require a dual-link DVI-D connection to supply the additional pin voltage needed for video signals.

Cevap

DVI-D ports output digital signals only and lack the analog pinouts required for a passive VGA adapter to function.
DVI-D stands for DVI-Digital. It carries only digital signals. A passive adapter does not contain electronic circuitry to convert digital signals to analog signals; it merely redirects pins. Because VGA is strictly analog and DVI-D lacks the four analog pins present in DVI-I or DVI-A, a passive adapter cannot pass video to a VGA display. An active digital-to-analog converter is required.

Adım Adım Çözüm

1
Identify the video output standard on the graphics card and the input standard on the projector.
The graphics card outputs DVI-D (Digital only), while the projector accepts VGA (Analog DB-15).
Determining signal compatibility is the first step in troubleshooting display connectivity.
2
Evaluate the capabilities of a passive adapter between DVI-D and VGA.
A passive adapter only pin-maps signals without performing active signal conversion; DVI-D lacks analog pins (C1-C4 pins found around the flat blade in DVI-I/DVI-A).
Without analog pins present in the source port, no analog signal reaches the VGA connector.
3
Determine the required solution to establish a working display connection.
An active DVI-D to VGA converter powered by an integrated chipset is necessary to translate digital signals to analog.
Active conversion translates digital packets to analog voltage waveforms required by VGA.

Anahtar Kavram

DVI Signal Formats and Adapter Compatibility
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Konular

Display Cables and Connectors

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