Troubleshooting - Panasonic TH-55LFV70U 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 Colour
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
There is no picture displayed or sound output from
the DIGITAL LINK terminal.
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.
90
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 POWER ON or STANDBY button on the remote control.)
If a signal with a non-applicable colour system format, or frequency is input, only the input
Normal Sound
terminal indication is displayed.
Colour controls set at minimum level.
Normal Sound
Colour system
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 fluorescent light.
Check whether the remote control designed specifically 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 FULL(toggle) 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 "HDMI power management". Any of them may be set to
"On (Enable)".
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.
When controlling the RS232C command on page 16 from the RS232C terminal in the
display, make sure that "Serial control" is "Serial in", and that it is "DIGITAL LlNK" when
controlling from the RS232C terminal of the DIGITAL LINK device.
Check whether "Control settings" has been configured properly. (When controlling from the
RS232C terminal of the DIGITAL LINK device)
Check whether the connection has been made properly.
Check whether "Network control" is "ON" when controlling with the WEB browser control or
using PJLink™ Protocol on page 80.
Check whether "LAN Setup" has been configured properly.
When connecting to a device of AMX, Crestron Electronics, Inc., or Extron, set "AMX D.D.",
"Crestron Connected™", or "Extron XTP" according to the device to use.
See the "Signal quality" information of "DIGITAL LINK status" to check the LAN cable status
such as whether the LAN cable is disconnected or the cable is not shielded.
Check whether the connection has been made properly between the video (output)
equipment and twisted pair cable transmitter and between the twisted pair cable transmitter
and this product.
Check whether "DIGITAL LINK mode" is set to "Auto" or "DIGITAL LINK" instead of
"Ethernet".
Checks