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only just read this so sorry if you have already solved, but had the same issue with mine (Samsung Smart TV)
easy fix is:- disconnect aerial cable
- turn TV off
- reconnect aerial cable
- auto tune channels
It should pick up all channels again, worked fine for me. Seems to happen occasionally due to a signal interference (ie has happened twice in 9 months)
- disconnect aerial cable
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Cheers for that, it turned out to be even simpler (but harder for me to fix).
The builder had put a socket plate on the wall for TV and internet, where previously we'd had the cable straight through the wall into the TV. The 'female' socket in the plate was set too far back so the male didn't engage properly.
Now sorted.
My TV is behaving oddly and will only pick up 9 channels - Film 4 HD, BBC 1 & 2 HD and a couple of other HD ones.
It's a Samsung smart TV with built in freeview and it has previously worked fine with the same aerial and found all channels. All that is different is that we've had the aerial which did come straight through the wall put into a plate on the wall, and then replaced the cable with a new one which runs from the socket on the plate to the TV.
I can't see how any of those problems would let me find some channels but not others.
Has anyone experienced anything similar or got any suggestions? Googling has drawn a blank.