[TechAssist] Re: Subject: Noisey coils & Transformers
- From: Dennis Viereck <wa6ati@xxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 30 Nov 2001 20:31:36 -0800
I used to use the screwdriver method years ago but the profound hearing
loss that trick won't work at all for me anymore.
I have used the spray Krylon clear plastic spray but I have not found it
for several years. I remember It worked quite well but the smell was
real strong during the curing process.
Oh for the good days of the bees wax covered coils and transformers.
Those never squealed, only the tubes that drove them.
Dennis
Daniel wrote:
> Hi Dennis:
> Since you asked :(
> I was 'taught' by an older Tv Tech to use a very long
> slender screwdriver, and to use the handle against my
> ear to locate the actual source of the 'whine'.As some
> may know: I was also supposed use rtv sealant to
> anchor various sources 'til I had eliminated the noise
> altogether.This advise worked in 90% of all cases I
> came across,however I had a Zenith portable that
> whined so badly that I couldn't quite find the true
> souce, and nothing seemed to work.I received a tip at
> the time to use a can of lacquer spray and lightly
> spray the entire chassis(remove from TV) and it worked
> very well.The trick is to get a thorough coating(into
> the tranformers and coils) and to use as little as
> possible.
> Anyway I'm sure the manufacturer would frown on this
> procedure, but it certainly works.
>
> --- Dude1127@xxxxxxx wrote:
> >
> >
> > Dennis
> > If you can't hear it hook up a small mike to your
> > scope to find it.,Les
> >
> > ----- Original Message -----
> > From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Wednesday, November 28, 2001 10:38 PM
> > Subject: [TechAssist] Noisey coils & Transformers
> >
> > Since we ran the "cleaning the video head" into the
> > ground I have
> > another question for the group. I would like to
> > know how all of you check
> > for coils, transformers, and other components that
> > sometime have the
> > tendency to squeal at high audible frequencies in
> > televisions? The devices
> > I mean are like flybacks, linearity coils, yokes
> > and brackets for these
> > devices. Once you find, how do you correct them? By
> > replacement or other
> > tricks? For those of you, like me, who's hearing
> > rolls off at 7 khz and
> > can't > hear these noises, how do you detect them,
> > and how do you know you
> > have it repaired if you can't hear these high
> > frequencies?
> > Dennis Viereck
> >
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>
> =====
> -Daniel
> Crystal Electronics
> help@xxxxxxxxxxxxxxx
>
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