JVC InteriArt LT-17D50BK Manual page 18

Hint: The channel list numbers are assigned by the
broadcasters. Because not all channels are broadcast
free-to-air and stored by the receiver, the channel list
numbers do not run continuously. The fifteenth channel in
the list, for example, may not be channel number 15 but
channel number 17.
Hint: If you enter a number which does not correspond to
a stored channel, the next valid channel number is se-
lected instead. If you enter a number greater than the
highest numbered channel in the channel list, the IDTV
will select the last channel in the list.
Operating while watching
IDTV
EVERYDAY OPERATION
Hint: Not all channels broadcast the programme
data. If the name and times of the programme is
not available then “No Information” is displayed
in the information banner.