Have had good picture in the past, but now the quality is poor. Did not coincide with any new hook ups, and the TV downstairs on the same comcast service has a better picture than this one!! This TV is only 4 years old. Tried a new DVI cable from cable box to HDMI slot on TV, still no improvement. Is it possible that the TV is degrading this soon? We don't watch a lot of TV, so I doubt it has many hours on it. Any ideas? Thanks
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Re: Poor Picture Quality
Try another cable box on the TV. I have seen these fail and cause problems. If the TV is okay with a DVD player, and not good on the cable service, most likely the fault is with the cable box, or the HDMI input circuit in the TV.
With the process if elimination it is possible to functionally work out where the defect is.
It is possible to have any TV fail. Both new and old sets can fail. Naturally, the older the set the greater the chance of failure, and reliability decreases with age and or use.
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By poor color quality, do you mean that if you turn the color control all the way down, the black and white picture is more like black and red, green or blue - or do you have a good black and white image? If the B&W image is good, and the TV is an old (8+ years) one, maybe the mirror inside the set needs a good cleaning - especially if there are smokers in the room. If you have a B&W picture that is tinted, then you may have to go into a service menu to adjust it back to a better picture. Hard to guess the problem without more specific description of symptoms.
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.