Troubleshooting - Panasonic TH-42LFE6W 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.
There is no picture displayed or sound output
sometimes.
The RS232C is uncontrollable
The LAN is uncontrollable
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.
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 À icker.
There may be red spots, blue spots, green spots and
black spots on the screen.
Image retention appears
52 52
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 format, or frequency is input, only the input terminal
Normal Sound
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 À uorescent light.
Check whether the remote control designed speci¿ 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 "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 30, 31)
When HDMI or DVI signals are input to the Display using a selector or distributor, sound or
images may not be output in the normal fashion depending on the selector or distributor used.
The symptoms may be improved by turning the power off and on again, or by replacing
the selector or distributor.
Check whether the connection has been made properly. (see page 12) When controlling
the RS232C command on page 12 from the RS232C terminal in the display, make sure
that "Control I/F Select" is "RS-232C". (see page 40)
Check whether the connection has been made properly. (see page 45) Check whether
"Control I/F Select" is "LAN" when controlling with the WEB browser control or the command
control on page 46. (see page 40) Check whether "LAN Setup" has been con¿ gured properly.
(see page 41) When connecting to a device of AMX, Crestron Electronics, Inc., set "AMX
D.D.", "Crestron Connected™", according to the device to use. (see page 40)
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 À 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 ¿ ne picture details. Occasionally,
a few non-active pixels may appear on the screen as ¿ 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.
Checks
Check