Dell U2722DX Service Manual page 18

Problem What You
Experience
No charging No charging
when using
USB-C
connection
to computer,
laptop, and so
on
(U2722DE only)
Intermittent Intermittent
charging when charging
using USB-C
connection to
computer,
laptop, and so
on
(U2722DE only)
No image when Black screen or
using USB-C 2nd DUT is not
MST Prime mode
No network Network
connection dropped or
Intermittent
The LAN port is OS setting
not functioning or cable
(U2722DE only) connection
issue
6. Trouble Shooting Instructions
Possible Solutions
• Verify if the device can support one of 5 V/9 V/
15 V/20 V charging profiles.
• Verify if the Notebook requires a >90 W power
adaptor.
• If the Notebook requires a >90 W power
adaptor, it may not charge with the USB-C
connection.
• Ensure that you use only Dell approved adapter
or the adapter that comes with the product.
• Ensure that the USB-C cable is not damaged.
• Check if the maximum power consumption of
device is over 90 W.
• Ensure that you use only Dell approved adapter
or the adapter that comes with the product.
• Ensure that the USB-C cable is not damaged.
• USB-C input, Go to OSD menu, under Display
Info check the Link Rate is HBR2 or HBR3, if
Link Rate is HBR2, suggest to use USB-C to DP
cable to turn on MST.
• Do not toggle Off/On the power button when
network is connected, keeps the power button
On.
• Ensure that the latest BIOS and drivers for your
computer are installed on your computer.
• Ensure that the RealTek Gigabit Ethernet
Controller is installed in the Windows Device
Manager.
• If your BIOS Setup has a LAN/GBE Enabled/
Disabled option, make sure it is set to Enabled.
• Ensure that the Ethernet cable is connected
securely on the monitor and the hub/router/
firewall.
• Check the status LED of the Ethernet cable to
confirm connectivity. Re-connect both ends of
the Ethernet cable if the LED is not lit.
• First power off the Computer and unplug the
Type-C cable and power cord of the monitor.
Then, power on the computer, plug in the
monitor power cord and Type-C cable.