Sharp PN-T321, Operation Manual

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26
E
Troubleshooting
If you are experiencing any problem with your display, before
calling for service, please review the following troubleshooting
tips.
There is no picture or sound.
• Is the power cord disconnected? (See page 10.)
• Is the main power switch off? (See page 13.)
• Is the monitor in standby mode (the power LED illuminating
in orange)? (See page 13.)
• Make sure correct input mode is selected. (See page 14.)
• If any external equipment is connected, make sure the
equipment is operating (playing back).
Remote control does not work.
• Are the batteries inserted with polarity (+,-) aligned? (See
page 12.)
• Are the batteries exhausted?
• Point the remote control unit toward the monitor’s remote
control sensor. (See page 12.)
• Is the menu display hidden or is operation disabled? (See
page 21.)
Sound from left and right speakers is reversed.
Sound is heard from only one side.
• Are audio cables connected properly? (See pages 9.)
• Check the setting of BALANCE for AUDIO menu. (See
page 18.)
There is no sound.
• Is the sound muted?
• Make sure the volume is not set to minimum.
• Are audio cables connected properly?
• When a video signal is not input, sound is not output.
Unstable video.
• The signal may be incompatible.
• Try the automatic screen adjustment when the PC D-sub
input terminal is used.
The video from the PC/AV HDMI input terminal does not
appear properly.
• Is the HDMI cable HDMI standard compliant? The monitor
will not work with cables that are not standard compliant.
• Is the input signal compatible with this monitor? (See pages
29 and 30.)
The video from the PC/AV DVI-D input terminal does not
appear properly.
• Is the input signal compatible with this monitor? (See pages
29 and 30.)
• Turn off the power to the connected equipment and then
turn the power on again.
The video from the AV COMPONENT input terminal does
not appear properly.
• Is the input signal compatible with this monitor? (See page
30.)
Control buttons do not work.
There is no picture.
• Load noises from outside may be interfering with normal
operation. Turn off the power and turn it on after waiting at
least 5 seconds, and then check the operation.
When “AUTO DIMMING” is displayed.
• When the internal temperature of the monitor rises
excessively, the brightness of the backlight automatically
decreases in order to prevent a further temperature rise. If
you attempt to use to adjust the brightness while the
monitor is in this state, “AUTO DIMMING” is displayed and
you cannot change the brightness.
• Remove the cause of the excessive temperature rise.
The monitor makes a cracking sound.
• You may occasionally hear a cracking sound from the
monitor. This happens when the cabinet slightly expands
and contracts according to change in temperature. This
does not affect the monitor’s performance.
The Power LED is flashing in red and green alternately.
When “TEMPERATURE” is displayed in the corner of the
screen.
• When the internal temperature of the monitor rises
excessively, the brightness of the backlight decreases
automatically in order to prevent high-temperature-
related problems. When this occurs, “TEMPERATURE” is
displayed on the screen and the Power LED flashes red
and green alternately. (When TEMPERATURE ALERT is
set to OSD & LED. This varies depending on the setting.)
• If the internal temperature rises further, the monitor
automatically enters standby mode. (The Power LED
continues flashing red and green alternately.)
• Remove the cause of the excessive temperature rise.
- If the monitor enters standby mode due to a rise in
temperature, to return to normal display, turn the power
switch off and then back on again. The monitor, however,
will enter standby mode again if the cause of the
temperature rise is not eliminated. (See page 5.)
- Check whether the monitor is placed at a location where
a quick rise in temperature is likely. Internal temperature
rises quickly if the vents on the monitor are blocked.
- Internal temperature rises quickly if dust accumulates
inside the monitor or around the vents. Remove dust if
possible. Ask Sharp dealer about removing internal dust.