To deal with the problem you must clear the channel list completely and then rescan - if your box has it in the menus, please the 'installation menu' to do an initial scan or a reset to factory settings or First Time Installation. You MUST delete the entire existing list of channels. On most boxes this technique can be also be used:
2) unplug the aerial from the Freeview box by disconnecting the cable from the 'RF in' socket;
3) wait 30 seconds;
4) plug Freeview box (or idTV) mains back in;
5) do a complete scan for channels - it will fail without the aerial. (This may be in the installation or initialization menu, and is distinct from any 'add channels option'). Once this is done your channel line up should be empty;
6) reinsert aerial by reconnecting to the 'RF in' connection;
7) do a complete scan for channels again.
The Freeview channel line-up provided by six "multiplexes" - each of which carry five or more TV channels, radio channels, text services and EPG data. In this diagram each ROW represents a multiplex. If you are still missing a whole multiplex (ie everything on the row) you may need to replace your aerial with a wideband type, purchase a larger aerial or you may have interference from a VCR, games console, Sky Digibox or similar.
We live on the opposite side of the Menai Straits in Penmaenmawr. We receive from Llandonna.
All of the BBC channels seem to be playing up on Freeview and have been doing so for several days now. The screen is continually pixellating. The TV that the problem is occuring on is a Panasonic Vierra obviously with Freeview integral.
It seems strange to me because the BBC channels are usually the strongest signal and never fail. I have two other TVs utilising Freeview in other rooms in the house and nether seems to show the same problem that the "main" lounge TV is experiencing. Of the the other two TVs one has integral Freeview, the other works of a box.
I have attempted retuning several times and it works for a short time and then it starts breaking up again.
All the other channels seem to be OK, even the Channel 4 ones, which are usually prone.
One thing that has been said is that ever since the digital signal was switched on a problem has existed across the Menai. If the sea is calm and the tide high, at certain times of day we evidently experience "signal bounce" which has the similar effect of breaking up the picture. I don't think that this is the case with my current problem with the break up of the BBC channels.
Brian Springthorpe: When you say that neither of your two other TV's show the same problem as your "main" lounge TV is experiencing, is that when they are tuned to the same channel as your Panasonic?
However, irrespective of whether they are or not I wouldn't advise altering anything at this present time, as many parts of the UK (particularly Wales / South Western area's) are experiencing intermittent problems with reception due to the effects of high pressure zones sweeping across the UK, said effects being the enabling of reception from distant transmitters (not necessarily UK based) which operate on the same channels to that used by the local station and clashing with same, some channels being affected much more than others dependant on the frequencies / channel numbers used by the local station.
This situation is unfortunately forecast as remaining until well into next week, albeit that its seen to clear for a short time late Wednesday / Thursday before returning with a vengeance for the following few days.