Dell P2423 - Page 68

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Horizontal/
vertical lines
Screen has one
or more lines
• Reset the monitor to factory settings.
• Perform Auto Adjust via OSD.
• Adjust the Phase and Pixel Clock
controls via OSD.
• Perform monitor self-test feature check
(see
Self-test) and determine if these
lines are also in self-test mode.
• Check for bent or broken pins in the video
cable connector.
• Run the built-in diagnostics (see Self-
Diagnostic).
• When using DVI-D/HDMI/DisplayPort
input, the Pixel Clock and Phase
adjustments are not available.
Synchronization
problems
Screen is
scrambled or
appears torn
• Reset the monitor to factory settings.
• Perform Auto Adjust via OSD.
• Adjust the Phase and Pixel Clock
controls via OSD.
• Perform monitor self-test feature check
(see
Self-test) to determine if the
scrambled screen appears in self-test
mode.
• Check for bent or broken pins in the video
cable connector.
• Restart the computer in the safe mode.
Safety related
issues
Visible signs of
smoke or sparks
• Do not perform any troubleshooting steps.
•Contact Dell immediately.
Intermittent
problems
Monitor
malfunctions on
and off
• Ensure that the video cable connecting
the monitor to the computer is connected
properly and is secure.
• Reset the monitor to factory settings.
• Perform monitor self-test feature check
(see
Self-test) to determine if the
intermittent problem occurs in self-test
mode.