Read Sharp PN-E421 (serv.man5) User Guide / Operation Manual online
37
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.
There is no picture or sound.
• Is the power cord disconnected?
• Is the main power switch off?
• Is the monitor in standby mode (the power LED illuminating
in orange)?
• Make sure correct input mode is selected. (See page 5.)
• 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
Operation manual.)
• Are the batteries exhausted?
• Point the remote control unit toward the monitor’s remote
control sensor.
• Is the menu display hidden or is operation disabled? (See
page 17.)
Sound from left and right speakers is reversed.
Sound is heard from only one side.
• Are audio cables connected properly?
• Make sure audio cables for external speakers are
connected properly: left and right cables may be reversed
or one of the two cables may not be connected.
• Check the setting of BALANCE for AUDIO menu. (See
page 11.)
There is a picture but no sound.
• Is the sound muted?
• Make sure the volume is not set to minimum.
• Are audio cables connected properly?
• Is the setting of AUDIO SELECT on the OPTION menu
correct? (See page 12.)
• Is the setting of SPEAKER SELECT on the SETUP menu
correct?
Unstable video.
• The signal may be incompatible.
• Try the automatic screen adjustment when the PC D-sub
input terminal or PC RGB input terminals are used.
The video from the PC/AV HDMI input terminal does not
appear properly.
• Is the setting for HDMI of INPUT SELECT on the OPTION
menu correct? (See page 12.)
• 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 page
41.)
The video from the PC/AV DVI-D input terminal does not
appear properly.
• Is the setting for DVI of INPUT SELECT on the OPTION
menu correct? (See page 12.)
• Is the input signal compatible with this monitor? (See page
41.)
• Turn off the power to the connected equipment and then
turn the power on again.
• If the monitors are connected in a daisy chain, turn off the
power to all the monitors connected in a daisy chain and
then turn the power on again.
The video from the PC RGB input terminals or AV
component input terminals does not appear properly.
• Is the setting for BNC of INPUT SELECT on the OPTION
menu correct? (See pagae 12.)
• Is the input signal compatible with this monitor? (See page
41.)
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.
The input mode changes automatically.
• When the AUTO INPUT CHANGE is ON and no signal
is present in a selected input mode, the AUTO INPUT
CHANGE automatically changes the selected mode to a
mode where a video signal is present.
The input mode may change in the following cases:
- When a computer is in standby mode.
- When video play is stopped with a playback device.
Power LED flashes red.
“STATUS [xxxx]” appears in the corner of the screen.
• Hardware has a problem. Turn off the monitor and request
repair from your SHARP dealer.
(When STATUS ALERT is set to OSD & LED. This varies
depending on the setting.)
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
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.
- 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.
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