Dell C7520QT User Manual

60 | Troubleshooting
Common Problems
The following table contains general information about common display problems you might
encounter and the possible solutions:
NOTE: Auto Adjust function is applicable to VGA input only.
Common
Symptoms
What You
Experience
Possible Solutions
No Video/Power
LED off
No picture •Ensure that the video cable connecting the display
and the computer is properly connected and secure.
•Verify that the power outlet is functioning properly
using any other electrical equipment.
•Ensure that the power button is depressed fully.
•Ensure that the correct input source is selected in the
Input Source menu.
No Video/Power
LED on
No picture or no
brightness
•Increase brightness & contrast controls via OSD.
•Perform display self-test feature check.
•Check for bent or broken pins in the video cable
connector.
•Run the built-in diagnostics.
•Ensure that the correct input source is selected in the
Input Source menu.
Poor Focus Picture is fuzzy,
blurry, or ghosting
•Perform Auto Adjust via OSD.
•Adjust the Phase and Pixel Clock controls via OSD.
•Eliminate video extension cables.
•Reset the display to factory settings.
•Change the video resolution to the correct aspect ratio.
Shaky/Jittery Video Wavy picture or fine
movement
•Perform Auto Adjust via OSD.
•Adjust the Phase and Pixel Clock controls via OSD.
•Reset the display to factory settings.
•Check environmental factors.
•Relocate the display and test in another room.
Missing Pixels LCD screen has
spots
•Cyclepoweron-off.
•Pixelthatispermanentlyoffisanaturaldefect
that can occur in LCD technology.
•FormoreinformationonDellDisplayQuality
and Pixel Policy, see Dell Support site at:
http://www.dell.com/support/monitors.
Stuck-on Pixels LCD screen has
bright spots
•CyclepowerOn-Off.
•Pixelthatispermanentlyoffisanaturaldefect
that can occur in LCD technology.
•FormoreinformationonDellDisplayQuality
and PixelPolicy, see Dell Support site at:
http://www.dell.com/support/monitors.

Dell C7520QT Specifications

General

Color gamut	72 %
Pixel pitch	0.429 x 0.429 mm
Aspect ratio	16:9
Screen shape	Flat
Response time	8 ms
Backlight type	LED
Display diagonal	74.5 \
Surface hardness	9H
Touch technology	Multi-touch
Touchscreen type	Multi-user
Anti-glare surface	Yes
Display brightness	350 cd/m²
Display technology	LCD
Native refresh rate	60 Hz
Supported video modes	2160p
Viewable size diagonal	1892.7 mm
Contrast ratio (typical)	1200:1
Display number of colors	1.073 billion colors
Number of simultaneous touchpoints	20
Certification	UL
Product color	Black
Panel mounting interface	400 x 400 mm
Placement supported	Horizontal
Ethernet LAN (RJ-45) ports	1
Display viewable area (HxV)	1649.7 x 927.9 mm
Cables included	DisplayPort, HDMI, USB, VGA
DVI port	-
USB version	2.0/3.2 Gen 1 (3.1 Gen 1)
USB hub version	3.2 Gen 1 (3.1 Gen 1)
USB connector type	USB Type-A, USB Type-B
USB ports quantity	7
HDMI ports quantity	3
USB upstream port type	USB Type-B
Height adjustment	No
AC input voltage	100 - 240 V
Power supply type	AC
AC input frequency	50 - 60 Hz
Energy efficiency scale	A to G
Power consumption (max)	270 W
Power consumption (standby)	0.3 W
Power consumption (typical)	140 W
Operating altitude	0 - 5000 m
Non-operating altitude	0 - 12191 m
Storage temperature (T-T)	-20 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Storage relative humidity (H-H)	5 - 90 %
Operating relative humidity (H-H)	20 - 80 %
RMS rated power	40 W
Number of speakers	2
Sustainability certificates	RoHS, ENERGY STAR
Harmonized System (HS) code	85285210
Package weight	Weight of the packaged product in gram.

Weight and Dimensions

Depth	78.74 mm
Width	1734.82 mm
Height	1018.54 mm
Weight	64000 g
Display width	1735.02 mm
Display height	1017.44 mm
Depth (without stand)	79.1 mm
Width (without stand)	1735 mm
Height (without stand)	1017.4 mm
Weight (without stand)	76000 g