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Zorluk: OrtaVideo, Display, and Projector Issues

A desktop technician is configuring a video editing workstation equipped with a modern dedicated graphics card supporting HDMI 2.1 and DisplayPort 1.4. When the external 4K display is configured to 3840×21603840 \times 2160 resolution at a 120 Hz refresh rate, the monitor frequently flickers, loses signal briefly, and automatically drops back down to a 30 Hz refresh rate. Reducing the display resolution to 1920×10801920 \times 1080 completely resolves the instability. Which of the following is the MOST likely cause of this behavior?

  1. The video interface cable connecting the graphics card to the display lacks the required bandwidth specification.Cevap
  2. B
    The graphics processing unit VRAM is overheating and experiencing thermal throttling.
  3. C
    The display backlight inverter board is unable to output sufficient voltage for higher frame rates.
  4. D
    The operating system graphics driver has corrupted resolution scaling parameters.

Cevap

The video interface cable connecting the graphics card to the display lacks the required bandwidth specification.
The correct option correctly identifies that running a monitor at 3840×21603840 \times 2160 at 120 Hz requires significant throughput. If the connected video cable is older or uncertified for high bit rates, the display engine will drop frames, lose signal, or automatically negotiate down to a lower refresh rate (such as 30 Hz) to maintain link stability. Replacing the cable with one rated for high bandwidth resolves the issue.

Adım Adım Çözüm

1
Analyze the reported symptoms and hardware parameters
The display experiences signal loss and refresh rate downgrades specifically at high resolution (3840×21603840 \times 2160 at 120 Hz), while operating stably at lower resolutions (1920×10801920 \times 1080).
High resolution and high refresh rates require significantly higher data bitrates over the physical video cable.
2
Evaluate physical layer vs controller capabilities
Both the GPU and monitor support high bandwidth specifications, ruling out hardware processing limitations.
If host and display endpoints support the resolution, the intermediary link cable is the limiting component causing handshake failures.
3
Identify the corrective physical action
Replacing the current display cable with an Ultra High Speed HDMI (HDMI 2.1) or DisplayPort 1.4/2.0 rated cable resolves the bandwidth bottleneck.
Cables certified for higher data rates maintain signal integrity without signal dropouts or automatic bandwidth throttling.

Anahtar Kavram

Display Cable Bandwidth and Signal Integrity Throttling
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Konular

Video, Display, and Projector Issues

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