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TROUBLESHOOTING
Customer servicing can be hazardous.
WARNING
Symptom
Po
int to check
See page
off.
• Press the power switch.
• The message “No Sync. Signal” or “Power
Save” is displayed.
! No Sync. Signal
No sync signal is detected.
• Make sure that the switch of the computer, imaging equipment ,
etc., is turned on.
• Make sure the computer is not in the power-save mode.
• Check to see if the input selection matches the connection
terminal.
• The message “Invalid Scan Freq.” is
displayed.
! Invalid Scan Freq.
• Check to see if the input signal matches the monitor
specifications.
no picture .
• Check the contrast and brightness settings (adjust them for higher
contrast and brightness).
slantwise.
• Text displayed across the screen appears
vertically streaked, with the characters in
vertical columns blurred.
• Adjust the dot clock frequency and phase. (Adjust the dot clock
(RGB input)
• Text displayed across the screen appears
blurred.
• A fine pattern flickers when displayed on the
screen.
• Adjust the dot clock phase for the clearest viewing.
(RGB input)
• The remote control does not work.
ViewSonic VPW4255 27
Symptoms That Appear to be Failures
Make the checks suggested below depending on the symptoms observed. If the symptoms remain, contact your dealer.
• No picture with the power-indicator lamp
• No picture with the power indicator lamp
light orange.
• The power indicator lamp is normally lit but
• The display image appears to be flowing
• Check to ensure the power cable is connected.
• Check to ensure the signal cable is connected.
An input signal is not being received normally.
• Check to ensure the signal cable is connected.
• Check to ensure the signal cable is connected.
frequency first, then the dot clock phase)
correctly.
• Try loading new batteries in the remote control.
• Check to see if the batteries are loaded in the remote control