You have to enter its service mode to do this. Just see, this is a skilled work, even though you haven't need to open the TV. After enter its service mode, if improper data setting has been done there without proper knowledge about it, a dead TV, with no response to external commands will be the result. If you wish to get more details to enter the service mode, and adjust the data values, check this link. Do not do anything, if you're not confident about it.
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the problem i have is that the picture on the digital tv is rubbish and i cannot get it to inprove and i need it to tune to oxfordshire/buckinghamshire and not london
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