Does your Samsung TV indicate signal strength and quality on channel 55 (746MHz) which is the Com 7 Mux that has BBC News HD on it?
If you can receive the BBC B Mux - which has all the usual PSB HD channels on, then your Samsung ought to be able to receive the Com 7 mux, as the parameters are almost identical.
The BBC B mux is on channel 54 by way of comparison. It might be worth looking at the comparative levels between these two adjacent channels - is the BBC mux much higher in level that the Com 7 one?
If Com 7 is there, but at low or no quality, then reducing the gain of your amplifier may help.
It might be that your Sony TV can cope better with higher level signals than the Samsung.
All a bit of a guess I'm afraid!
Note that on the 20th Feb, Com 8 will move to channel 56 from Winter Hill, and on the 22nd April there are yet more changes.
Details here https://www.freeview.co.uk/sites/default/files/2019-11/700mhz-clearance-events-granada-region.pdf
Last edited by commseng on 15 February 2020 10:25am