Can anyone else hear the 15750 Hz tone generated by most TVs? My girlfriend was telling me I was crazy and that the sound didn't exist until my Uncle Chuck explained that the sound does exist while we were back in Illinois for my Grandmother's birthday & Christmas.
I've got two TVs in my apartment (a 15-ish-year-old 20" GE and a 3-year-old 36" Toshiba) and I can hear both if they are on no matter where I am in the apartment (2 BR/2 BA, separate kitchen & dining room; it's not a small place), even if the doors are closed.
I'm almost ready to go out and spend $3000 on a nice 1080p LCD screen so that I can sit in the living room in peace because even turning the volume way up (with 500W of Klipsch power behind it) doesn't drown it out... Heh, the only good news is that all of the big-box retail stores are getting rid of their CRT screens (or at least tossing them in the back corner of the store) so if I do break down and decide to go shopping, at least I won't get a headache at the same time.
You are definate not crazy! I've heard that dang noise for a long time. I never looked up what frequency it was, though.
My older 27" JVC produces a vary loud whine, or at least it is loud for me. I can always tell when someone has left it on. Surprisingly however, my 53" sony HDTV with 6" CRT guns doesn't make a noise that I can hear. Or at least, it has never bothered me. I wonder if the 6" gun doesn't make such a loud noise because it is so small when compared to the CRT in the 27" TV, which I imagine goes from the rear all the way to the glass.
Heh, your HDTV is making noise, you just can't hear it because it's a higher pitch. The 15750Hz is generated because standard NTSC signals are 30fps with 525 lines of resolution. You multiply that out and you get 15750Hz. An HDTV has a higher resolution so the frequency is pushed higher, outside the range of human hearing.
In any case, it's not a problem for me anymore. This past week I bought a 52" Sharp AQUOS LCD. 1080p goodness...
I've got a quick picture I took yesterday morning (while the "low battery" light on my camera was blinking away). I'll post it up a bit later.