I purchased a poloroid tv 3732 in may of 2005 from circuit city, after about 14 months the set began making a clacking sound and humming sound that gets so loud it is unbareable. I have to turn the set off. I have found out I am not the only one with this problem that has a poloroid tv. I had a technician at my home that told me there is a service warranty on these sets because the wrong part was used and the part needs to be replaced.
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Hello; If you have a plasma TV, is fairly common to hear buzz noises. They can be always there or intermittent. They can get louder as the screen gets brightest. If the buzz is noticeable when you are at normal volume setting, the buzz is excessive and a PCB probably needs replacing. These buzz noises are almost never a sign of failure or safety. LCD TV's can also buzz, but the same applies. John
Often over the years the Transformer laminations can loosen, from the on/off rising and collapsing magnetic fields, and then they sorta hum louder. I suspect this is what is going on. Shouldn't be too much of a worry.. keep an eye on it tho.
The "IF coil" is used for all channels, so if channel 5 is clear but 25 is not, the problem is not in the IF. If your IF coil was loose or bad, all channels would drift off and you would have no picture or sound. If you have the TV set to "SAP", some channels would have no sound at all, so I doubt that your settings are wrong. I suspect that the problem is with your cable signal, not your TV.