Sharp PNK321 User Manual

30

E

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.

•  Are the AC adapter and power cord properly connected? 

(See page 13.)

•   Is the main power switch off? (See page 15.)
•   Is the monitor in standby mode (power lamp is off)? (See 

page 15.)

•   Make sure correct input mode is selected. (See page 16.)
•   If any external equipment is connected, make sure the 

equipment is operating (playing back).

•  Are audio cables connected properly? (See page 12.)

•  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 SETUP menu 

correct? (See page 20.)

•  Is the headphone (etc.) cable connected to the headphone 

terminal?

•  Turn down the volume.
  With some input devices, the sound may crackle at high 

volume.

•  The signal may be incompatible.

•  Is the HDMI or HDMI DUAL setting correct in INPUT 

SELECT on the SETUP menu? (See page 20.)

•  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 

33 to 34.)

•  Is the cable a certified DisplayPort cable? Use the supplied 

cable. The monitor will not work unless a standards-compliant 
cable is used.

•  Is the input signal compatible with this monitor? (See page 

33.)

•  Try restarting the monitor and computer.
•  Is the video card MST (Multi Stream) compatible? If not, set 

to SST (Single Stream).

•  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 you display the screen or clear the screen, the left 

and right screen display timing may be slightly off; however, 
this is not a problem.

•   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 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 brightness adjustment button (  /  ) 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.

•   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.

•   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 7.)

-  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.