Troubleshooting - Panasonic TH-47LFT30W Operating Instructions Manual

Troubleshooting

Before you call for service, determine the symptoms and make a few simple checks as shown below.
Symptoms
Picture
Interference
Normal Picture
No Picture
No Picture
No remote control operations can be performed.
A cracking sound is sometimes heard from the unit.
The top or bottom of the picture on the screen is cut
off when I use the zoom function.
Areas at the top and bottom of the screen where
the image is missing appear when I use the zoom
function.
I can hear sounds coming from inside the unit.
Parts of the unit become hot.
Power automatically turns off unexpectedly.
The fans become louder.
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.
For TH-47LFT30W
The display screen of the Display is equipped with touch panel. Touch panel devices are inside the glass. How noticeable they are
depends on the way in which they are exposed to light. So, note that it is not a failure.
LCD Display panel
Symptoms
The screen darkens slightly
when bright pictures with minimal
movements are shown.
It takes a while for the picture
to appear.
The edges of the images fl icker.
There may be red spots, blue
spots, green spots and black
spots on the screen.
Image retention appears
Whirring sounds can be heard
from the display unit.
Sound
Electrical Appliances
Noisy Sound Cars / Motorcycles
Fluorescent light
Volume
No Sound (Check whether the mute function has been activated on the remote control.)
Not plugged into AC outlet
Not switched on
No Sound
Picture and Brightness/Volume setting
(Check by pressing the power switch or stand-by button on the remote control.)
If a signal with a non-applicable colour system format, or frequency is input, only
Normal Sound the input terminal indication is displayed.
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.)
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.
Adjust the position of the picture on the screen.
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.
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.
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.
Check the settings of "Power management", "No signal power off" and "No
activity power off" in the Setup menu. Any of them may be set to "On (Enable)".
(see page 32)
The fans become louder because they run faster to cool the inside of the Display
as the temperature is raised.
The product is fi tted with cooling fans.
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.
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.
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.
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.
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.
The Display is equipped with fans. The whirring sound is caused by rotation of the fan and is not a
malfunction.
Checks
Check
41