A user connects a new 4K external monitor to a laptop using a USB Type-C cable. While the laptop successfully charges through the connection, the monitor displays a "No Signal" message and enters power-saving mode. The laptop's USB-C port is verified to support DisplayPort Alternate Mode (DP Alt Mode). Which of the following is the most likely cause of this display issue?
- The USB Type-C cable in use is rated only for power delivery and USB 2.0 data transfer, lacking video channel wiring.Answer
- BThe laptop's graphics processing unit (GPU) drivers are corrupted and unable to output digital video signals.
- CThe laptop's internal display backlight inverter board has failed, blocking external display transmission.
- DThe USB Type-C interface requires an analog VGA conversion adapter to transmit high-definition video.
Answer
The USB Type-C cable in use is rated only for power delivery and USB 2.0 data transfer, lacking video channel wiring.
The correct answer identifies that USB Type-C cables vary in internal wiring. Standard charging cables only include power pins and USB 2.0 data lines, omitting the high-speed data lanes necessary for DisplayPort Alternate Mode video transmission. Replacing the cable with a full-featured USB-C or Thunderbolt cable will resolve the 'No Signal' condition.
Step-by-Step Solution
Key Concept
USB Type-C Cable Capabilities and DisplayPort Alternate Mode
Estimated Time:1m 15s