Sharp LC-20SH21U Operation Manual page 33

Before calling for repair services, make the following checks for possible remedies to the encountered symptoms.
Antenna
Problem
The picture is not sharp.(NTSC)
The picture moves.(NTSC)
The picture have block
noise. (ATSC)
The audio sound is
discontinuous.
The picture is doubled or
tripled.
The picture is spotted.
There are stripes on the screen
or colors fade.
PC
Problem
There is no image.
There is no sound.
The text is blurred.
The image is not displayed in
the center of the screen.
Cautions regarding use in high and low temperature environments
a malfunction, and the unit will recover when the temperature returns to normal.
• Do not leave the unit in a hot or cold location. Also, do not leave the unit in a location exposed to direct sunlight or near a heater, as
this may cause the cabinet to deform and the LCD panel to malfunction.
Storage temperature: –4°F to +140°F (–20°C to +60°C)
• The reception may be weak.
• The quality of the broadcast may also be bad.
• Make sure the antenna is facing the right direction.
• Make sure the outside antenna is connected.
• Make sure the antenna is facing the right direction.
• There may be interference from automobiles, trains, high voltage lines,
neon lights, etc.
• There may be interference between the antenna cable and AC cord. Try
positioning them further apart.
• Is the unit receiving interference from other devices?
Transmission antennas of radio broadcasting stations, transmission
antennas of amateur radios and cellular phones may also cause
interference.
• Use the unit as far apart as possible from devices that may cause
possible interference.
Check item
• Make sure the RGB cable is properly connected.
• Make sure the output signal of the PC and the input signal
setting of the LCD TV set are matched.
• Some software prohibit video playback on an external display
when playing back a video with a notebook PC. This is not
attributable to a problem with the LCD TV set.
• Make sure the PC audio cable is properly connected.
• Check if the mute function activates, or if the volume is set to
minimum.
• Adjust "Phase" using the Auto Sync menu.
• Adjust "Horizontal position" and "Vertical position" using the
Auto Sync menu.
Troubleshooting (Continued)
Check item
Reference
page
31
31
–
31
16
21
21
33