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What you need to do is retune the TV, but when it is finished look at the regional settings. Or if the regional option is available before retuning, retune selecting your area so then you get normal BBC channels. It's likely that at the moment the channels for BBC are located at the very top end of the channel list say? - channel 800+.
You are clearly picking up signals from many transmitters. With regional settings you can change it to the area you live in.
But you will have to take into account how good your aerial is. Otherwise the signal quality will not be good on same transmitters. So the set may only suggest those with the best quality signals.
ITV stations might also change.
When done it will move the channels you mention to the top end of the guide, to 800+.
Note many HD channels have no regional options. For example here in Yorkshire we only get ITV Granada and not Yorkshire TV on the HD channel for ITV1. And BBC1HD does not show any programmes when local news comes on.
This is a fairly common issue, either the TV has the upper channels blocked or the signal in that room is just not as strong so a quick scan is passing them over. I will give you the steps to remedy both issues. If the channels show up weak or snowy or not at all after trying these steps you may need to install a booster where you current line splitter is but try these steps first as the TV can easily compensate for a slightly low signal.
Enter the TV Menu, Select TV, Select Channels, Select Master List. Look for channels with X beside them, if they have X they are blocked, simply move down the menu selecting each one to remove the X.
Now that you have verified or corrected your master list select Turn on Additional Scan from the scan menu and run a new scan. The additional scan will take a lot longer but will take more time on each channel and should find them even if the signal is a little low.
You are pointing your antenna on the wrong direction.Move it around until you find the strongest signal. When you did the channel scan, the box (or tv) detected a signal but since it is to weak now, it will not display it.
Sounds like you have a bad signal from the antenna or the cable. Unlike analog TV if the signal level drops below a certain level you loose the picture and sound completely. The fact that digital channels are detected during channel search does not mean they have a good signal. Try moving the antenna about.
The unit has an auto detection circuit to determine what signal is being input, it then processes it, however if the signal is altered (different channel) the TV will at times try to process it through the wrong resolution circuit causing problems. Change the input of the TV and then change it back and it will redetect the 720p instead of the 1080i and display it properly. Check with Sony for possible updates.
Since it has voice or sound then I don't suspect the tuner but probably the tuner does not have the 33 volts that goes through r106 location number on the board. It is a 27K resistor and can be bought for about a dollar at Radio Shack. (pack of 2or3) A repairman or someone experienced in electronic soldering and desoldering can change it easily. Could cost around $50 to repair depending on the serviceman. If it has rca jacks (red, white and yellow) The tuner can be bypassed if you have a cable box that passed these signals: audio left and right and video. Hope this helps