Run a full channel scan through the menu and the rest should show up as well.
Some TVs also have ability to manually turn off channels, which makes it easier to navigate when using UP and DOWN channel buttons. Instead of going to every single channel available you skip the ones that have been marked for skipping. It's a useful feature, but can get you in trouble.
Once a local hotel called us to repair 5 of their TVs and what turned out was that someone has played a joke on them and disabled all channels from the menu.
http://www.coppelltvrepair.com
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