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Main => Monitor/Video Forum => Topic started by: newmanfamilyvlogs on February 02, 2011, 09:27:20 pm

Title: quieting crt whine
Post by: newmanfamilyvlogs on February 02, 2011, 09:27:20 pm: Can the high pitched whine from a crt be minimized? Where does it actually originate from?
Title: Re: quieting crt whine
Post by: Nephasth on February 02, 2011, 10:43:57 pm: Your ears are too sensitive, expose yourself to loud music for extended periods of time. ;)
I can hear a high pitch buzzing/whining from many electronic devices that everyone else in my family can't seem to hear.

As for your questions, I have no idea. Sorry.
Title: Re: quieting crt whine
Post by: qrz on February 03, 2011, 09:10:22 am: the horizontal output stage is the typical offender .
"singing" components may be located with a gentle nudge with an insulated probe while listening for any change
in sound . installing,wedges,shims,glue to the offending part MIGHT provide a cure.

using NTSC , the operative frequency is 15.734Khz.
this is within the human auditory range . scan freqs above 20Khz are unheard.

as men age, the high end reception drops off considerably.
as such, i am no longer able to hear a 15Khz tone .
Title: Re: quieting crt whine
Post by: kardenm on February 03, 2011, 09:25:13 am: Some monitors, like the WG7203 have a heavy guage wire which makes a couple of turns around part of the FBT. I found that this sometimes is the source of a high pitched squeal. This "noise" can be reduced or eliminated by repositioning the wire coils with an insulated screwdriver.
Title: Re: quieting crt whine
Post by: newmanfamilyvlogs on February 03, 2011, 09:30:25 am: My wife notices the sound much more than I do. I suspect I already have a bit of frequency loss due to the previously suggested application of loud noises in my earlier years.

I'll have to poke around in there with something non-conductive and see what I can find. I suppose next will be looking for some material to dampen the noise with. Maybe I can pack in some kind of acoustic insulation around the entire chassis.
Title: Re: quieting crt whine
Post by: qrz on February 03, 2011, 09:53:32 am: caution, insulation will likely interfere with ventilation.

and no surprise the XYL is more sensitive to the sound.
Title: Re: quieting crt whine
Post by: newmanfamilyvlogs on February 03, 2011, 10:37:54 am: I'll keep the ventilation in mind if I do anything.
Title: Re: quieting crt whine
Post by: Gray_Area on February 04, 2011, 08:18:03 pm: Quote from: qrz on February 03, 2011, 09:53:32 am
and no surprise the XYL is more sensitive to the sound.

It depends on the type of sound....
Title: Re: quieting crt whine
Post by: boardjunkie on February 04, 2011, 08:53:35 pm: Its just the horiz scan freq that yer hearing. It bugs some ppl, others not so much. Really nothing you can do about it....