Dell Thunderbolt U4025QW User Manual

100 | Troubleshooting
Common
Symptoms
What you
experience
Possible solutions
The monitor
cannot detect
signal connect
with dock after
AC/DC Off/On,
cable uplug/
Plug
Connect the Dock
USB-C
®
cable to the
platform. Connect
DUT with TBT4 cable
to the Dock USB-C
®
port. The monitor
cannot detect the
signal after AC Off/
On TBT4 cable
Unplug/Plug
• Connect the monitor directly with the
platform.
• Change the TBT4 cable to a USB-C
®
cable.
The two
monitor
maximum
resolution
cannot reach
5120 x 2160 @
120 Hz when
TBT Daisy
Chain
Connect 1st DUT
with TBT4 cable
to the platform.
Connect 2nd DUT
to the 1st DUT
Thunderbolt
TM
out
port with TBT4 cable.
The 2nd monitor or
1st monitor cannot
reach 5120 x 2160
@120 Hz
• Make sure the OSD Thunderbolt Daisy
Chain is “Optimized”.
2nd monitor
shows black
screen when
TBT daisy chain
and enable
SmartHDR
on both OSD
and Windows
display setting
Connect 1st DUT
with TBT4 cable
to the platform.
Connect 2nd DUT
to the 1st DUT
Thunderbolt
TM
out
port with TBT4 cable.
Set both DUT to the
maximum resolution
(5120 x 2160). Enable
SmartHDR on both
OSD and Windows
display setting. 2nd
monitor shows black
screen
• Intel UHD graphic limitation, suggest to use
Intel Iris graphic.
• Disable SmartHDR on both OSD and
Windows display setting.

Dell Thunderbolt U4025QW Specifications

General

Screen Size	40 inches
Aspect Ratio	21:9
Panel Type	IPS Black
Refresh Rate	60 Hz
Color Support	1.07 billion colors
Curvature	2500R
VESA Mount	100 x 100 mm
KVM Switch	Yes
Resolution	5120 x 2160
Brightness	300 cd/m²
Contrast Ratio	1000:1
Response Time	5 ms
Color Gamut	98% DCI-P3
Ports	RJ45
Speakers	2 x 9W
Built-in Microphone	Yes
Stand Adjustability	Height, Tilt, Swivel
Weight (with stand)	14.4 kg