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Re: not clear picture
If this is an HD set and you are using a SD signal I have seen many disappointed people because the upgrade that takes place in the digital video circuit is far from perfect. It will not look like it did at the store without HD!
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Most of the Analog viewing will be much poorer compared to HD. Since it it a digital product, it is designed to be used with a digital signal. You will get signal degradation if it has to take the analog and convert it to digital to be viewed and there is really nothing that can be done to compensate for it.
Hope this helps,
Do you have cable or satellite? Disconnect them and if you currently have free over the air TV and the same problem occurs with these channels, then there's something wrong with the TV. If the problem only occurs on channels with sat or cable connection, then there may be a faulty cable somewhere that can easily be replaced.
If the problem occurs with free channels, one solution (although a long one) would be to unplug your TV completely for about a week, this will reset the TV settings
You may have a bad flyback transformer (high voltage trans former). The lines you're seeing are retrace lines caused by the picture tube screen set too high. This is often caused by the screen control opening up. This control is part of the flyback.