Hitachi 42PD7800 - Manual (Page 50)

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TROUBLESHOOTING
Symptoms That Seemingly Appear to be Failures
Make the checks suggested below depending on the symptoms observed. If the symptoms remain uncorrected, contact your dealer.
Customer servicing can be hazardous.
WARNING
Symptom Point to check See page
• No picture with the power-indicating lamp
off.
• Check the way the power cable is connected.
• Press the power switch.
• The power indicating lamp is normally lit but
no picture.
• Check the contrast and brightness settings (adjust them for higher
contrast and brightness).
• Check the way the signal cable is connected.
AAAAA
AAAAA
• The message “Invalid Scan Freq.” is dis-
played.
An input signal is not received normally.
• Check to see if the input signal matches the monitor
specifications.
• Check the way the signal cable is connected.
! Invalid Scan Freq.
• The message “No Sync. Signal” or “Power
Save” is displayed.
• No picture with the power indicating lamp
lights in orange.
No sync signal is detected.
• Check the way the signal cable is connected.
• 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.
! No Sync. Signal
• The display image appears flowing slant-
wise.
• 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 frequency first, the dot clock phase next.)
(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. • Check to see if the batteries are loaded in the remote control in
opposite direction.
• Check to see if the batteries in the remote control are OK.
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• The display image does not appear in the
normal position.
• Check to see if the displayed input signal match the monitor speci-
fication by pressing button.
• Turn off the screen saver.
• The display has picture missing on the
screen.
(PC input mode only)
• Turn off the screen saver.
• The temperature of the display panel surface is high. • The plasma display panel is lighting the phosphors by the
discharge of internal radiation. In some cases, this may cause the
temperature of the panel surface to increase. Please note that this
is not a malfunction.
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