Maintenance | Troubleshooting
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Maintenance
First, unplug the power cord plug from the wall
outlet.

Power cord plug

Wipe the plug with a dry cloth at regular intervals.
(Moisture and dust can lead to fire or electrical shock.)

Display panel

The front of the display panel has been specially treated.
Wipe the panel surface gently, using only a cleaning
cloth or a soft, lint-free cloth.
●If the surface is particu larly dirty, soak a soft, lint-f ree
cloth in diluted, mild liquid dish so ap (1 part mild liquid
dish soap diluted by 100 times the amou nt of water)
and then wring the cloth to remove exc ess liquid. Use
this cloth to wipe the surfac e of the display panel,
then wipe it evenly with a dry cloth o f the same type
until the surface is dry.
●Do not scratch or hit the surfac e of the panel with
fingernails or other hard obje cts. Furthermore, avoid
contact with volatile substanc es such as insect
sprays, solvents, and thinner; oth erwise, the quality
of the surface may be adversely af fected.

Cabinet

If the cabinet becomes dirty, wipe it with a soft, dry cloth.
●If the cabinet is particular ly dirty, soak the cloth in
diluted, mild liquid dish soap and th en wring the cloth
dry. Use this cloth to wipe the cabin et and then wipe it
dry with a dry cloth.
●Do not allow any mild liquid dish soap to c ome into
direct contact with the sur face of the TV. If water
droplets get inside the unit, oper ating problems may
result.
●Avoid contact with volatile substa nces such as insect
sprays, solvents, and thinner; oth erwise, the quality
of the cabinet surface may be adver sely affected or
the coating may peel off.
●Do not let articles made from r ubber or PVC be in
contact with the TV for long p eriods of time.

Pedestal

●Wipe the surfaces with a sof t, dry cloth. If the unit is
particularly dirty, clea n it using a cloth soaked with
water to which a small amount of mild liqu id dish soap
has been added and then wipe with a dr y cloth.
Do not use products such as solvents, thinner, or
household wax for cleaning, as they can damage the
surface coating. (If using a chemically-treated cloth,
follow the instructions supplied with the cloth.)
●Do not attach sticky tape or la bels, as they can make
the surface of the pedestal di rty. Do not allow long-
term contact with rubber, vinyl pr oducts, or the like.
(Doing so will cause deteriora tion.)
Troubleshooting
Before requesting service or assistance, please follow
these simple guides to resolve the problem.
If an error message appears, follow the message’s
instructions.
If the problem still persists, please contact your local
Panasonic dealer for assistance.
Picture
Why is there no picture or just a blue, black or
snowy screen being displayed?
Check if the power cord is plugged in and the TV
is turned on (front red LED light should be on; not
blinking).
Press the INPUT button on the remote control to
select the correct input source.
Ensure all connections are correct and secure.
When using external video source, such as a Cable/
Satellite box or DVD player, check that the device is
on and functioning correctly.
Press MENU on the remote control. If the menu is
displayed, then the TV is working; recheck above
steps.
Why doesn’t the picture look like it is in High-
Definition?
Press INFO on the remote control to confirm the
type of signal being received. HD signal should be
720p, 1080i or 1080p.
Select a High-Definition channel from your HD
source (Cable, Satellite or fiber optic service). HD
channels sometimes broadcast non-HD content.
Ensure that your HD source (HD box, Blu-ray
player, etc.) is connected to the TV with an HDMI or
COMPONENT cable and set to output an HD video
signal.
Why do black bars appear on the top and bottom
and/or sides of the screen?
Change the format (aspect ratio) of the picture by
pressing FORMAT on the remote control (p. 15).
Check the aspect settings on your external video
source, such as Cable/Satellite box, DVD/Blu-ray
Disc player, etc.
Note: Some content, such as film-based movies, are
available in extra-wide format. Top and bottom bars
are unavoidable.
Why is the picture snowy when [ANTENNA/Cable
In] is selected?
When using a cable service (without a box), check
that all connections are secure.
When using a cable or satellite box, change the
connection to COMPOSITE, COMPONENT or HDMI
(p. 11-12).
If you’re using an antenna, then check that
connections are secure. Change the position or
direction of the antenna and check the [Signal
meter] (p. 14).
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TC-40A420_32_39A400U_EN.indd 28TC-40A420_32_39A400U_EN.indd 28 28-Apr-14 4:28:23 PM28-Apr-14 4:28:23 PM