This could be too much signal.
Just to be sure though, try the set in another room where one of the other TVs works okay. This will help you see if it's a cable or a TV signal issue. If you pick up all the channels
okay it's likely that that other TV point has some bigger signal losses due to the cabling.
The
mux (transmitter channel) carrying the BBC signals will be amongst the strongest at each and every TV transmitter across the land. This is because the BBC and the main ITV channels have to reach about 96% of the mainland UK population in order to the broadcasters to fulfill their remit.
TV tuner sensitivity varies between brands and models. It may be that your old TV
was just about okay with the signal power, but the new TV's tuner is over saturated.
A simple and inexpensive
diagnosis tool is a variable attenuator. The MA1620 on this page is perfect for that job:
Splitters amplified splitters and attenuators
It will give you a way to reduce the signal level at one TV without affecting the other TVs in the house.
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