Re: Noise from monitor...
* Donald R. Spoon (firstname.lastname@example.org) [020816 20:06]:
> Hall Stevenson wrote:
> >* Ron Johnson (email@example.com) [020816 16:56]:
> >>On Fri, 2002-08-16 at 15:00, Hall Stevenson wrote:
> >>>After one of my XFree86 4.x upgrades, my HP Ergo 1280 (17", model
> >>>D2840A) monitor started making a "noise". Sometimes it's a continual
> >>>sound, other times it's occassional. Whenever it occurs, it's _VERY_
> >>>annoying. I'm at a loss as to how to describe the sound... I guess it's
> >>>just a medium to high-pitched tone, sorta the "white noise" kind. Anyone
> >>>know what I mean ??
> >>>This does not occur with MS Windows, so it probably an XFree86-related
> >>>problem. My XFConfig-4 file has no modeline info as I think this was
> >>>removed starting with X 4.x. After sending this message, I'll restart X
> >>>and log the messages and look for anything interesting...
> >>>Has anyone ran into anything similar ?? If so, how did you solve it ??
> >>X isn't configured correctly, and I think this is damaging your
> >>monitor. Do you have any backup copies of XFConfig-4?
> >Go figure... Since posting my message, the monitor hasn't made that
> >"noise" yet !!
> >I still think I'll reconfigure X and use the "simple" option when it
> >asks about my monitor. I trust it will use very safe HorizSync and
> >VertRefresh numbers.
> This is probably too late if you re-configured, but chances are you are
> inducing an eddy-current in a metalic object from the magnetic fields
> around the deflection coils AND the frequency just happens to be at the
> object's natural resonance. Simply put, you have a very expensive,
> single frequency loud speaker <grin>. This can be a "bad" thing if the
> resonant object happens to be inside the CRT, but normally it is just a
> nuisance. Finding what is vibrating can be a PITA... If it is still
> under warranty, it might be worth while checking with the MFGR to rule
> out a loose element in the CRT, especially if you are operating it
> within the published limits.
Huh ?? :-)
It's not under warranty anymore so I'll have to find some sort of
Speaking of specs, the HP manual says this:
Horizontal Sync: 31-92
Vertical Refresh: 50-150
Using 'dpkg-reconfigure xserver-xfree86' and choosing the "simple"
monitor selection, I pick the 17" monitor option. It uses a value of
30-70 and 50-160, HS and VR. Using the "medium" selection and choosing
1280x960@85hz, it uses value of 30-92 and 50-85.
When I hand-entered the spec values, I get the noise. When I use the
"medium" values, I get the noise. When I use "simple", so far, no noise.
Problem solved ?? Maybe...