[Username1]

When I was working for a tv shop back in the 80's and cable was growing, Panasonic had a few of their sets that would get an overloaded signal when fed by cable, but work fine with ota reception. Their fix was a replacement of a few if parts, and then an in field "turn of one coil" that would reduce or eliminate the problem. I also have a few tvs that are sensitive to excessive noise when fed from such things as dvd or vcr's.

If you have identified the coil you wish to turn then you should try it. But do it in a way that prevents you from ruining the alignment. Turn the coil one or two turns, keep track of that you did, If its the right coil, there should be a significant change. If not, then turn it right back to exactly where it was, and do the same thing with a different coil. Don't chose a random coil, and don't do more than one at a time.

If its an old tv, some had buzz controls, others had both the last video, and sound detector coils that effected buzz from sharp white writing on the screen. AGC is a good place to start, check that first, since you will be feeding old tv's now with non broadcast signal sources, you can de-tune the AGC with little detrimental effects.

Stay away from first, second, third if coils, you don't want to mess those up. You want the stuff after that, where the detector is just before the sound amp. Those coils decide where the circuit is choosing the frequency to pick the sound from, if its up or down from there it is, you will get poor sound, or the buzz.

wa3ise has a good idea though, you could use a resistor impedance matching network to drop part of the signal across a load before the tv sees it. This can cut the signal level down, and then you can make up the rest with the AGC control.

All are possible fixes, you should do the least troublesome first, like the resistor network, AGC, turn coils last, but do it in a smart way, where you can put it back the way it was without en entire re-alignment. You might even want to look into a signal attenuator you can get at solidsignal for a few bucks.