User's Manual

55 Troubleshooting
Sensors
MST connection
KVM Switch
No sound can be heard from the connected external speakers.
• Remove your headphone (if the headphone is connected to the monitor).
• Check whether the headphone jack is properly connected.
• If the external speakers are USB-powered, check whether the USB connection is OK.
• Increase the volume (volume may be muted or too low) on the external speakers.
The light sensor of the monitor does not work well.
The light sensor is located at the front bottom of the monitor. Please check:
• If you have removed the sensor protection sticker.
• If the Bright Intelligence function has been turned on. Check Ergonomics > Bright
Intelligence
.
• If there are any obstacles in front of the sensor that keep the
sensor from detecting the light properly.
• If there are any objects or clothing in bright colors in front of
the sensor. Bright colors (especially white and fluorescent
colors) reflect light and the sensor cannot detect the main
light sources.
The MST function does not work.
• Make sure ON is selected under System > MST.
• Make sure the graphic card on your computer supports DP 1.4 for MST.
• The compatibility of each computer varies by hardware and/or software. You may need to go
through all the cables, specifications and settings to ensure that your system supports MST. If
your computer is a Mac, try with a Windows system. MST is available on a Mac OS via
Thunderbolt connection only.
No response after selecting KVM Switch > USB Upstream.
Check the cable connections and menu settings in the following order.
• Check if an appropriate cable has been connected to the monitor and the second video
source properly. See Connect the PC video cable. on page 14 for more information.
• Check if the input source has been selected to the second video input from KVM Switch >
Video Input.