On Jan 17, 1:29*pm, Mark wrote:
On Jan 15, 1:10*am, Steve Kraus
wrote:

Sony KV-27EXR25, probably 14 or 15 years old. *Back in 2004 I
replaced a
failed regulator with help from this NG.

In the past few months I've been getting a loud buzz at certain
instances
when there's some overly white video. *Picture flops around a bit
too.

It's directly on analog cable and I don't doubt that Comcast may
occasionally have signal levels that are out of spec but it
doesn't seem to
bother other sets in the house including one that is a similar
Sony, maybe
a few years older even. *So I'm wondering if something is out of
whack on
the TV. *Is there a solution (besides the eventual upgrade to
digital HD
flat screen)?

Find the sound QUAD coil or discriminator coil and give it a little
tweak until the sound clears up.

Don't dick with the RF alignments. Someone already pointed out the AGC
is a strong culprit. If that doesn't do the trick, I'd want the whole
IF swept to find out what is _really_ going on.

If all your TVs buzz on a certain channel when there is heavy white
in
the screen, then call Comcast and thell them they are
overmodulating
the video.

Mark

GG