My 32inch Murphy LCD TV can not find the new channels and some old ones have disappeared after re-tune
This could be a problem to do with your aerial rather than the TV. However, your first action should be a "Factory Defuault" reset. Make sure the TV does a full retune rather than just looking at the channels where the stations were previously.
The TV will have a flat response through the channel frequency range. Your aerial though could be a very different matter. Depending on the type of aerial, and especially if it's a banded aerial that discriminates against certain frequencies, then the retune may well have moved certain channel into frequencies that your current aerial really struggles to pick up.
You don't say what your TV region is, so I can't be specific because you didn't give the necessary information in the question. But I'll give you an example based on my region which is North West England, receiving off the Winter Hill transmitter.
Anyone with a Group C/D banded aerial will be okay picking up most of the channel muxes because they're grouped up at the top end of the frequency range (ch 49~57). That's pretty perfect for a C/D aerial. However, the new Freeview HD channels that give BBC 4 HD, 4 +1HD, BBC News HD is down at ch 37. A C/D aerial will struggle to pick that up because it is far less sensitive at that frequency, and particularly so if it is a contract Yagi type aerial.
The majority of aerials fitted though are the so-called Wideband High Gain. These favour the upper end of the frequency range again. So channel 37 will be picked up. But is is much weaker than the other muxes.
SOURCE: i cracked my new 32inch lcd tv screen need new one
Don't know what brand it is but, it really doesn't matter the screen or lcd panel cost as much or more than a new set. Sorry.
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