[TechAssist] Re: Subject: Noisey coils & Transformers

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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