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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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Before you go that far, realize that the cable itself may be the problem. Usually poor picture quality can be traced to poor cable connections. Also, another possibility is poor connections inside the tuner of the set. I assume that you are using a cable box. Some of the newer boxes have direct video connections which will connect as you describe. Check the condition of all of the cables and connectors before yo invest in anything.
If the input to a HD tv is not in HD format the tv won't display an image very well. Be sure your input to the tv is compatible with the tv's technology for optimum performance quality Also re-check the input source (such as converter box, dvd player, etc..) and be sure you have the correct input/output ports connected properly. Try to reset all yout tv settings back to manufacturers defult specs. When an input signal is sent to the tv most modern tv's have software built in to select the proper format to display the input image. There may have been a mismatch communication error when your tv software tried to "handshake" with your converter box input signals from its firmware. So try a reset solution and re-connect the tv without the converter and see if that helps. If not e-mail me and I'll determine if the tv needs technical servicing.
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.