Panasonic TH-55AS740A Manual page 201

After digital TV tuning, (or re-tuning) some or all DTV channels are missing
Check to ensure your area is covered by DTV transmissions.
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Check that the aerial and antenna cable are designed for DTV reception.
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If you live within 5-10 km of DTV transmission towers, a combined VHF
/ UHF Digital TV aerial should be adequate. Outside this area, separate
VHF and UHF aerials provide superior reception performance.
If you live in a unit or apartment, check to ensure the Master Antenna
●
TV (MATV) system is designed for analogue and DTV reception. Please
consult your body corporate.
Picture infrequently pixelates on some or all channels
Electrical interference caused by local or distant lighting storms, heavy
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rain, high wind, etc. may cause picture to break up and / or audio to mute /
distort momentarily.
Impulse noise interference from an infrequently used electrical appliance,
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or a passing vehicle or lawn mower with a "noisy" ignition system.
Older style antenna cabling, loose fitting/corroded wall socket connections
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/ terminals, etc.
Picture regularly pixelates on some channels, or
Check Signal Condition
●
or Signal Strength
cable connections. If the problem persists, consult your local TV antenna
installer.
Too much signal; is
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attenuating (reducing) the signal strength.
Check that the aerial and antenna cable are designed for DTV reception.
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The received signal may be too weak to allow the TV to reliably lock to the
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selected channel to generate a viewable picture. If the problem persists,
consult your local TV aerial installer.
Interference from household appliances (known as impulse noise) such
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as light switches, fridges, etc. may cause picture break up and / or audio
distortion. Use high quality quad shielded coaxial cable (RG6Q) fly lead
between TV and antenna wall socket to minimise impulse noise pickup. If
the problem persists, consult your local TV aerial installer.
Antenna installation may be using an aerial amplifier that is faulty or an
●
older style aerial amplifier that was not designed for digital TV.
via TV Setup menu. If the level of
is not high or constantly changing, check aerial /
Signal Strength always at full strength? If yes, try
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No signal message
Signal Quality