Panasonic th-47lf30 User Guide
46
Troubleshooting
Before you call for service, determine the symptoms and make a few simple checks as shown below.
Symptoms
Checks
Picture
Sound
Interference
Noisy Sound
Electrical Appliances
Cars / Motorcycles
Fluorescent light
Cars / Motorcycles
Fluorescent light
Normal Picture
No Sound
Volume
(Check whether the mute function has been activated on the remote control.)
(Check whether the mute function has been activated on the remote control.)
No Picture
No Sound
Not plugged into AC outlet
Not switched on
PICTURE and BRIGHTNESS/Volume setting
(Check by pressing the power switch or stand-by button on the remote control.)
Not switched on
PICTURE and BRIGHTNESS/Volume setting
(Check by pressing the power switch or stand-by button on the remote control.)
No Picture
Normal Sound
If a signal with a non-applicable color system format, or frequency is input, only the input
terminal indication is displayed.
terminal indication is displayed.
No Color
Normal Sound
Color controls set at minimum level. (see page 25, 26)
COLOR SYSTEM (see page 40)
COLOR SYSTEM (see page 40)
No remote control operations can be performed.
Check whether the batteries have discharged completely and, if they have not, whether they were
inserted properly.
Check whether the remote control sensor is exposed to an outdoor light or a strong fl uorescent light.
Check whether the remote control designed specifi cally for use with the unit is being used. (The unit
cannot be operated by any other remote control.)
inserted properly.
Check whether the remote control sensor is exposed to an outdoor light or a strong fl uorescent light.
Check whether the remote control designed specifi cally for use with the unit is being used. (The unit
cannot be operated by any other remote control.)
A cracking sound is sometimes heard from the unit.
If there is nothing wrong with the picture or sound, this is the sound of the cabinet undergoing
very slight contractions in response to changes in the room temperature. There are no adverse
effects on the performance or other aspects.
very slight contractions in response to changes in the room temperature. There are no adverse
effects on the performance or other aspects.
The top or bottom of the picture on the screen is cut
off when I use the zoom function.
off when I use the zoom function.
Adjust the position of the picture on the screen.
Areas at the top and bottom of the screen where
the image is missing appear when I use the zoom
function.
the image is missing appear when I use the zoom
function.
When using a video software program (such as a cinema size program) with a screen wider
than one in the 16:9 mode, blank areas separate from the images are formed at the top and
bottom of the screen.
than one in the 16:9 mode, blank areas separate from the images are formed at the top and
bottom of the screen.
I can hear sounds coming from inside the unit.
When the power is turned on, a sound of the display panel being driven may be heard: This is
normal and not indicative of malfunctioning.
normal and not indicative of malfunctioning.
Parts of the unit become hot.
Even when the temperature of parts of the front, top and rear panels has risen, these temperature
rises will not pose any problems in terms of performance or quality.
rises will not pose any problems in terms of performance or quality.
Power automatically turns off unexpectedly.
Check the settings of “NO SIGNAL POWER OFF”, “PC POWER MANAGEMENT”,
“DVI-D POWER MANAGEMENT” and “NO ACTIVITY POWER OFF”. Any of them may be
set to “ON (ENABLE)”. (see page 32, 33)
“DVI-D POWER MANAGEMENT” and “NO ACTIVITY POWER OFF”. Any of them may be
set to “ON (ENABLE)”. (see page 32, 33)
This LCD Display uses special image processing. Hence a slight time lag may occur between image and audio, depending on the type of input signal.
However, this is not a malfunction.
However, this is not a malfunction.
LCD Display panel
Symptoms
Check
The screen darkens slightly when bright pictures with
minimal movements are shown.
minimal movements are shown.
The screen will darken slightly when photos, still images of a computer or other pictures with minimal
movements are shown for an extended period. This is done to reduce image retention on the screen
and the shortening of the screen’s service life: It is normal and not indicative of malfunctioning.
movements are shown for an extended period. This is done to reduce image retention on the screen
and the shortening of the screen’s service life: It is normal and not indicative of malfunctioning.
It takes a while for the picture to appear.
The unit digitally processes the various signals in order to reproduce esthetically pleasing
images. As such, it sometimes takes a few moments for the picture to appear when the power
has been turned on, when the input has been switched.
images. As such, it sometimes takes a few moments for the picture to appear when the power
has been turned on, when the input has been switched.
The edges of the images fl icker.
Due to the characteristics of the system used to drive the panel, the edges may appear to fl icker
in the fast-moving parts of the images: This is normal and not indicative of malfunctioning.
in the fast-moving parts of the images: This is normal and not indicative of malfunctioning.
There may be red spots, blue spots, green spots and
black spots on the screen.
black spots on the screen.
This is a characteristic of liquid crystal panels and is not a problem. The liquid crystal panel
is built with very high precision technology giving you fi ne picture details. Occasionally, a few
non-active pixels may appear on the screen as fi xed points of red, blue, green, or black. Please
note this does not affect the performance of your LCD.
is built with very high precision technology giving you fi ne picture details. Occasionally, a few
non-active pixels may appear on the screen as fi xed points of red, blue, green, or black. Please
note this does not affect the performance of your LCD.
Image retention appears
Image retention may occur. If you display a still picture for an extended period, the image
might remain on the screen. However, it will disappear after a while. This is not considered
as malfunction.
might remain on the screen. However, it will disappear after a while. This is not considered
as malfunction.