I have a Sony 65XD9305 (freeview, roof aerial). It has worked absolutely fine for a year or so. A couple of days ago I lost a couple of channels I usually watch (BBC News HD 107 for example). I started investigating the problem and I have now lost all channels on two multiplexes broadcast from Crystal Palace. (com7 and com8)
When I went to signal diagnostics, these missing channels show 0 strength and 0 quality. Not even a flicker of signal there.
I tried resetting the TV and retuning all channels. Now those channels do not show at all, which means I cannot even do the signal quality check anymore.
Where should I start investigating this? Is there any more diagnostics I can do on the TV now when the channels do not even exist in the system anymore?