Troubleshooting - Panasonic TH-80LFB70U 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.
Parts of the unit become hot.
Power automatically turns off unexpectedly.
There is no picture displayed or sound output
sometimes.
Multi-touch operations cannot be performed.
Whirring sounds can be heard from the display unit.
The RS-232C is uncontrollable*
80
Sound
Electrical Appliances
Cars / Motorcycles
Noisy Sound
Fluorescent light
Volume
(Check whether the mute function has been activated on the remote control.)
No Sound
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
the input terminal indication is displayed.
Normal Sound
Colour controls set at minimum level (see page 51, 52)
Normal Sound
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.
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", HDMI1 Power management, HDMI2 Power management and "No
activity power off". Any of them may be set to "On (Enable)". (see page 63, 67)
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 if the "Setup" - "Touch Screen Settings" is set to "On". (see page 59)
The touch panel is an optical device that uses infrared rays. Incident light that
contains large quantities of infrared rays can prevent proper functioning. Move
light sources as far away from the touch panel as possible.
Fluorescent light: Does not produce infrared light, so it does not cause
Sunlight: Locate the touch panel where it is not exposed to direct sunlight.
White candescent light: Contains the most infrared light and can readily affect
Strong external noise can cause the microcomputer inside the touch panel to
malfunction, therefore keep noise sources as far away as possible.
The display unit is ¿ tted with a cooling fan to dissipate heat generated during normal
use. The whirring sound is caused by rotation of the fan and is not a malfunction.
Check whether the connection has been made properly. (see page 15)
When controlling the RS-232C command on page 15 from the RS-232C
terminal in the display, make sure that "Control I/F Select" is "RS-232C", and
that "Control I/F Select" is "RS-232C(DIGITAL LlNK)", and "DIGITAL LINK
mode" is "DIGITAL LlNK(RS-232C)" when controlling from the RS-232C
terminal of the DIGITAL LINK device.
Checks
problems.
the touch panel. Move light sources as far away from
the touch panel as possible.