Testimonial: "Well we determined it wasn't the TV because we hooked another on up that was fine and it did the same thing so it must be the providers problem with the cables or something. Thanks for the help."
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Though this is evidently a problem within the TV, just try changing the input device to some other like a DVD player and see. Look for any loose contacts in RC jack, cable and socket, as intermittent contacts can bring such funny looking problems, as the TV does not get time to recover from the making/breaking time. If problem persists, I recommend you call in a qualified service technician, as opening the back cover by others is not advisable.
If you actually have the Zenith model TV (B25A24Z), the trouble is not in your set. This model has only an analog tuner, and what it sounds like you are describing is digital pixellation. This is what happens with a digital-to-analog converter box when it gets a weak signal, with rain fade or heavy snow on a satellite dish antenna, or when a digital cable system has some signal problems. The converter equipment locks the last complete frame (or breaks up into blocks and freezes) and the sound is muted.
You'll need to look for the cause of your trouble in whatever is feeding the TV. If you have a digital converter box for off-the-air broadcasts, make sure you have a good antenna and all the connections are tight. If you have satellite TV service or digital cable service, you might need to contact your service provider for help in troubleshooting and fixing the trouble.
If you have lost your freeview channels & your picture has been breaking up (pixelating / freezing) etc as well as crackle on the audio, then I would suspect you check your antenna, it could be your incoming signal is weak which would give you these problems.
Edy, I am not going to say that this is the definite issue but Dish only has receivers that are 1080i compatible at the time which will give you some blurring and possible pixellating. 1080p will resolve these issues in the future. Therefore if you still need help let me know.
You can change the way the channels can be displayed/viewed by a video setting, consult manual. When pic breaks into pixels and sound goes it's usually a reception problem so you'll have to adjust the antenna facing a direction that makes that channel come in clearly. It helps to experiment with positions and antennas.