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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.
What is your TV signal source? Press the Input button on the remote and try another input. (Make sure a DVD player or set-top box is on.) If you are on the TV input, try a different channel. Next make sure that your cables are securely connected to the TV and devices. Replace with new cables to test them. If you use an OTA antenna with a splitter, try a direct connection. (Similarly, if you have an amplifier on the signal, try a connection without the amplifier.)
For OTA or direct cable connections, try accessing the Channel Setup menu and rescanning for channels.
I hope this helps.
Cindy Wells (I get some weak channels that give No Signal messages when the transmitter has a problem or the weather is bad. I've also had a signal splitter/amplifier fail and block specific channels by becoming a filter. The direct connection identified the amplifier problem.)
Activated by a PIN number, you can set Parental Controls on your TV
and/or cable set-top box to control the programs that can be viewed on
your TV. There are three ways to block programs:
By Time Period (Not available in all areas.)
The V-Chip understands television program ratings and blocks programs
based upon the rating level selected. All TV sets that are 13 inches or
larger are required to incorporate the V-Chip technology. Parents set
rating levels so that certain TV shows need a password to be viewed.
For more information on the V-Chip and program ratings visit the FCC V-Chip site. Several cable and satellite companies offer parental control options.
They allow specific channels to be blocked so that they cannot be
viewed.These companies also offer the ability to block shows based on
language, violence, nudity, and rating levels. This offers more
flexibility than the V-Chip.
I know more about the astar tv and models.
The only problem of this model of LTV-20PW is shows blocks when happen to some of channel on TV. Because of the bad reception or your location. To clear this problem is go to v-chip and clear off, menu, channel added. That should take care of it.
Any question please call 323-767-6030.