[wellylug] Faulty Monitor

[Dean]

I have this problem with my screen also with certain resolutions and refresh
rates, the longer the screen is on does have an effect.
On finding the right settings it went away, but I believe I had to change
the linux ones by hand as when I tried to set it up with the GUI I got no
screen at all after rebooting (screen complained and turned off).

Dean



> Message: 5
> Date: Mon, 23 Aug 2004 21:37:38 +1200
> From: Tony Wills <ajwills at paradise.net.nz>
> Subject: Re: [wellylug] Faulty Monitor
> To: wellylug at lists.naos.co.nz
> Reply-To: wellylug at lists.naos.co.nz
>
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> At 20:44 23/08/04 +1200, you wrote:
>
> >On Mon, 2004-08-23 at 18:28, Wayne Koorts wrote:
> > > Yes, I find that's quite a common problem with (generally older)
> > > monitors.  Your local electronics repair guy should be able to fix it
> > > pretty cheaply, unless it's under warranty.
> >
> >it's only half a year old!
> >
> >It's still under warranty through :-)
>
> If it's under warranty why are you bothering us then? ;-)
>
> The noise is most likely from something vibrating at the refresh frequency
> (or some harmonic there of), most likely the flyback transformer.  You may
> find that at different refresh rates and resolutions you get a different
> noise.  I don't know why different colours would effect this (maybe the
> higher screen current with brighter displays marginally effects the
refresh
> circuitry, but then you'd probably notice the display width change).
>
> Turning it off most likely simply lets it cool off, maybe there's a bad
> solder joint the opens up when hot.  Capacitors don't make much sound
> (apart from bang!).  Is it a high pitched pure note or more of a wheezing
> sound?
>
> If it wasn't under warranty and you wanted to fix it yourself, you'd want
> to check out the mounts of the flyback transformer and surrounding metal
> screen etc to ensure none of it can vibrate (of course first unplugging
it,
> checking the tube is discharged and being qualified to do it, might help).
> Bumping the monitor (percussive maintenance) may have some effect, as
might
> titling it sideways, flexing the case etc.
>
> Whether you'll get it replaced under warranty is a different matter - they
> might just tell you they all do that :-)
>