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Re: noise from monitor, HELP!

On Wed, Aug 02, 2000 at 09:57:12AM -0700, kmself@ix.netcom.com wrote
> On Tue, Aug 01, 2000 at 11:24:59PM -0700, Jaye Inabnit ke6sls wrote:
> > On Tue, 01 Aug 2000, Ron Farrer wrote:
> > > 
> > > 
> > > I've been running Debian for years and my monitor (20" IBM P200) has
> > > been working fine with it's current setting for months. 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? 
> > > 
> > > FYI I am running potato using a Matrox Mill. (original) with 8MB
> > > memory @ 1024 x 768. 
> > > 
> > 
> >     Ron,
> > 
> > I have a 17" 'emachines' monitor. It was making some pretty heavy
> > noise too when I first fired up x after running XF86Setup.  I don't
> > know why but in windoz it was quiet but x was giving it grief.. I
> > finally tweaked the settings and cured the noise (Think I increased
> > the res)..   I'm sure it's probably unrelated, but I recall seeing
> > upgrades to x the last two times I ran the 'apt-get update/upgrade' so
> > perhaps you need to tweak things on ur end... Just a thought.
> Given this, it's possible that modifications to video settings via
> xvidtune might dispose of harmonics leading to monitor hum, if the cause
> is resonance rather than failing bonds or fasteners.  Haven't tried it
> myself, but the logic seems to work mentally.

Actually, the cause is usually a combination of the two.  The
yoke should be designed to provide good damping across the
usable range of the monitor, but as adhesive perishes and things
get freed up modes start appearing which may be close enough to
the scan frequencies you actually use (or a subharmonic thereof)
to cause hooting.

> While hitting a monitor may provide a short-term fix, I'd suspect it
> would compound the problem of a degrading joint.  Not generally
> recommended.

I don't know what he paid for his 20" monitor but I could take a
guess; for myself, I try to avoid thumping things that cost that

John P.
http://www.mdt.net.au/~john Debian Linux admin & support:technical services

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