Dell S2721NX Service Manual

5. Trouble Shooting Instructions
Common problems
The following table contains general information about common monitor problems you
might encounter and the possible solutions.
Common
symptoms
What you
experience
Possible solutions
No video/
Power LED off
No picture • Ensure that the video cable connecting the
monitor 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 and contrast controls
through OSD.
• Perform monitor 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.
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 about Dell Monitor Quality
and Pixel Policy, see Dell Support site at:
https://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 about Dell Monitor Quality
and PixelPolicy, see Dell Support site at:
https://www.dell.com/support/monitors.

Dell S2721NX Specifications

General

Screen Size	27 inches
Resolution	1920 x 1080 (Full HD)
Panel Type	IPS
Refresh Rate	75 Hz
Response Time	4 ms (Gray to Gray)
Aspect Ratio	16:9
Brightness	300 cd/m²
Contrast Ratio	1000:1
Color Support	16.7 million colors
VESA Mount	100 x 100 mm
Connectivity	HDMI, VGA
Viewing Angle	178° (horizontal), 178° (vertical)
Features	Flicker-Free
Weight (with stand)	4.7 kg (10.36 lbs)