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I recently got the AV-27F702. While I am very happy with the picture, I am very frustrated with a noise generated from the TV. When the TV is turned on, it has a fairly loud 16Khz (I tested it with a tone gen) tone. I find it very piercing and the sound doesn't go away. With time, your ears go numb to it, but because of this, when the TV gets turned off, your ears ring at 16khz. This is a 100+lb TV, I live on the second floor, and I recently tore 2 ligiments in my knee,...so returning the TV to the store for an exchange isn't an easy option in any fashion. Even if I was to return it, if the TV had the same repeat problem...big problems. Your suggestions please. Thanks=)
Follow Ups:
Almost all NTSC tube TVs have this behavior. The sound comes from the ringing of the cathode tube. Because of the vertical and horizontal scanning frequencies on 480i NTSC format, most TVs produce a ring at around 15KHz. It's more prominent on some TVs than others.Turning down the brightness helps a little but won't rid the problem. You will have to change to a DTV which scans at least twice the rate, producing the tube ring at 30KHz and above, inaudible to most people.
Try turning the brightness down and see if the sound disappears, it could be a vibration in the tube mounting or flyback transformer, or a componenet out of tolerance.
Yes, it sounds like maybe a flyback transformer. Reducing the brightness and/or contrast might help. I cannot actually hear to 16 kHz anymore, but I know what you're talking about. I used to have this problem with my 27" Sony when I first got it, and I found it rather annoying. Either it went away by itself or my high frequency hearing ability declined to the point where it stopped bothering me. I haven't tested my ears lately, but I think I would be lucky to even be able to hear to 15 kHz.Todd
Thanks for your feedback. Changing the adjustments didn't seem to help.Is this problem fairly common with TV's and are just not reported since many people have lost that part of their hearing?
Is there any fix to this problem other than the suggested contrast/brighness adjustments?
Open TV and knock on flyback with screewdriver handle. Or just give a knock to TV couple times it may go away. Other than that you have to replace flyback.
Problem is not very common in new TVs. This repair is not covered by warranty, but depends who provide repair you may get it for free.
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