How to resolve TV tuning issues?

turning tv off and on wont make it better

you on roof antenna or a cable tv
if antenna only
you may be in weak signal area
or a new construction site or buildings deflecting the signal
antenna problem or needs upgrade

go back to TV set up and re-tune tv to bbc if possible

if it freezes then you know its an interrupted signal

Did you ever get any BBC channels on that TV and did they stop suddenly, or is it a new TV. Are you inside GB or somewhere els on the world. Does your cable company give through all BBC channels for free, or should you pay for these channels.
Just a few questions to answer one by one. I should start with your cable company.

Try the TV in a location where one of the other TVs works. That will show if it's a TV or a cabling issue.

It's entirely possible you have too much power in the aerial signal system. The mux carrying the BBC channels will be one of the strongest at each TV transmitter across the UK. This is because something like 96% of the UK mainland population must be able to receive at least the BBC and main commercial channels to fulfill the broadcasting requirements. Your old TV might not have been so sensitive. The new TV might be more sensitive. So the signal is overwhelming the digital tuner.

Try a variable attenuator. This will give you a power control to reduce the signal as it comes in the back of the new TV without upsetting the other TVs. The MA1620 on this page is perfect for this. http://www.satcure.co.uk/accs/page15a.htm
Splitters amplified splitters and attenuators

This could be too much signal thanks to the Freeview retunes going on. Your aerial is more sensitive at some frequencies, so there's more signal power higher up the frequency range.

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.

You might have more than one transmitter. Some TV's etc only store a certain number of channels and have a max amount!. When weaker transmitters are present sometimes the memory of the TV will only store the stronger signals first from these weaker sites, with the two BBC channels being too weak to be detected.
The solution is to do a manual search on the transmitters you know are very strong. For example if channel 43 has strong signal you would search on that. The auto search will start at 21 and work it's way to 69. But if your area transmitter with the strongest signals is high up the scale the weaker transmitters will be selected first!

check that your Antenna points the same direction as everyone else in your road.
you might need a better antenna

i would re tune your freeview to see if it picks up BBC again

Hope this helps

There is not a problem with the TV despite it's age this is can be due to your reception of the digital package for BBC. Have you checked through he full listings? sometimes the BBC channel will be at a different number setting because of the transmitter you are receiving. I assume you are using a digital box, you can enter a menu which will give you an indication of the strength & quality of the incoming signal. Do you pick up some of the other BBC channels such as BBC3 or CBBC? It's possible your aerial strength is a bit weak for the digital BBC package & you may need to have that looked at.

I have the same box and re-tuned mine with the same results as you.However i discovered that the NEW BBC channels were on the channel guide list starting at channel 800

Electrical Storm normally damage Tuner in TV.
Symptoms in tv like poor analog tv signal reception shows replace TV Tuner.
Regards,