Re: noise from monitor, HELP!
Oh, I forgot to post this... only sent it to John.
----- Original Message -----
From: "Stephan Hachinger" <Stephan.Hachinger@gmx.de>
To: "John Pearson" <huiac@camtech.net.au>
Sent: Wednesday, August 02, 2000 12:49 PM
Subject: Re: noise from monitor, HELP!
> Hello!
>
>
> > > Now all of a
> > > sudden I get a VERY high pitched noise from it when in X. It does not
do
> > > this on the console! It has become more and more frequent and is
> > > starting to drive me nuts (well more then usual :) I know it's the
> > > monitor because I can turn it off while it's doing it and the noise
> > > stops. Does anyone know what the problem might be?
> > >
> >
> > If it is a regular CRT-style monitor, there are wire coils
> > wrapped around the CRT to deflect the electron beam to provide
> > horizontal & vertical deflection; these are probably glued in
> > place (or at least, in bundles) using epoxy resin or something
> > similar.
> >
> > Probably, the epoxy has cracked or come loose from whatever it's
> > anchored to at some point and what you can hear is some or all
> > of the windings on the horizontal deflection coil rattling back
> > and forth in time to the horizontal scan, in accordance with
> > Newton's laws ("For every action there is an equal and opposite
> > reaction"). Just maybe, it's some other part of your monitor's
> > yoke doing the same thing. It's irritating as hell if you can
> > hear it, but it shouldn't affect the monitor's performance or
> > reliability.
>
> John is right! It's probably one of the wire coils, as I just read on a
> German homepage.
>
> Andrew wrote:
> > I usually just hit mine :)
> He's wrong, I think. Hitting electronic components indeed stops many
> problems, but in this case, the deflection coils get even more loose and
so
> it's just a temporary solution.
>
>
> > Possible solutions:
> > - Pay someone to fix it. If you take it in for a service, be
> > *very*clear* about the problem or it probably won't get fixed
> > (chances are, most of their techs won't be able to hear it).
> This is the only one I suggest!
>
> Or perhaps, at a lower or higher vertical frequency, the noise does not
> appear any more.
>
> You can also try to fix the coils yourself. But be aware of HIGH VOLTAGES
> appearing in monitors even if they are plugged off. There are capacitors
> installed. So, if you wanna fix them, put on rubber gloves. And start the
> repair after you have plugged it off for some hours. Don't touch any metal
> parts if possible, because there are maybe still parts carrying high
> voltage.
>
> To repair it, simply open the case, locate the coils and fix them using
> epoxy 2-component glue.
>
> If the problem does not disappear after this action, maybe it wasn't
caused
> by the deflection coils but by the "line transformer" (this is how Germans
> call it, I don't know if this is good English). I've read that this
> transformer can be located by backtracing the thick anode cable starting
at
> the picure tube. The site said you can fix the parts of this transformer
> using "plastic spray". Does anyone know if epoxy also works? I think so.
>
> *IMPROTANT* If you open the monitor case, the granted guarantee period is
> definitely aborted and over. And I have once opened a monitor using thick
> rubber gloves, but never done the above to any. So I do not know what the
> result will be. If you don't know about electronics, you should better
have
> it fixed by anyone else instead of lying kind of "ESD-demaged" besides
your
> monitor and not moving any more. But it is very likely that fixing the
> deflection coils will fix the problem for the next years. About the
plastic
> spray: I do not know what it is and if it works and what happens if you
> don't spray it only on your trafo but also on the rest of the electrics by
> accident. I've only read about it.
>
>
> Regards,
>
> Stephan Hachinger
>
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