Sony KDL-70X830B - Manual (Page 221)

Only snow noise or a black picture appears on the
screen.
Check if auto tuning is performed.
Check if the antenna is broken or bent.
Check if the antenna has reached the end of its serviceable life (3-5 years
for normal use, 1-2 years at a seaside location).
There is picture or sound noise when viewing a TV
channel.
Perform [Fine Tune]/[AFT] to obtain better picture reception. (Option name
differs depending on your region/country.)
Set [Audio Filter] to [Off], [Low] or [High] to improve sound for analog
reception. ([Audio Filter] may not be available depending on your
region/country.)
Set [LNA] to [Off] to improve picture reception. ([LNA] may not be available
depending on the situation/region/country.)
You cannot receive any channels.
Check the antenna/cable connection.
Make sure the [Cable/Antenna] setting is correct for your TV signal source.
If using CATV STB, refer to its instruction manual for installation.
You cannot receive or select channels.
Perform [Auto Program] to add receivable channels that are not present in
the TV’s memory.
To receive or select cable channels, make sure that signal type in the
channel settings is set to [Cable].
To receive or select channels by antenna, make sure signal type is set to
[Antenna].
Some digital cable channels are not displayed.
Certain cable companies have limitations on the broadcast of digital cable
channels. Check with your cable company for more information.
The digital cable channel may be set to [Hidden] in [Show/Hide Channels].
Broadcast HD formats have poor quality.
215