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'Monitor making high pitched noise'
1999\11\06@150907 by Mike M

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hey guys i have a Sony 15" monitor with built in speakers and mic.  Lately, ever
y now and then it starts to make this high pitched squeeling noise..NOT out of t
he speakers, but internally somewhere.  If i unplug or press the mute button on
the speakers, the sound still continues, and it doesnt sound like its comming fr
om the speakers.  The microphone is NOT CONNected so its not from that either...
any ideas?

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1999\11\06@171827 by Aaron

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this is a whine from the power supply.  Get your monitor checked out - it
probably has a faulty cap on the high voltage side



{Original Message removed}

1999\11\06@192018 by Eric Richards

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Could be the Horizontal output transistor (HOT), the Flyback transformer
(FBT), maybe something else
with a TV you can measure if the collector-Emitter of the HOT is shorted (or
leaky), then short the Base-Emitter of the HOT with a short piece of wire,
connect a mains light bulb about 75 Watt (230 volts ) across the HOT then
turn the set on, if the light glows measure the B+ going into the FBT, put
everything back and measure the B+ again, if the Voltage is a lot lower,
then it could be a faulty FBT

But with monitors it can be a bit different for example sometimes you have
one HOT to do the Extra High Tension EHT & another HOT to do the horizontal
scan.

Now in Sony New Zealand there is a person you can ring for Technical help.
BUT someone once said " If you can't say anything nice about someone don't
say anything at all " so I will leave it at that then.

>From Eric


{Original Message removed}

1999\11\06@193719 by Brian Kraut

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Check your video settings and make sure you don't have the horizontal frequency
too high.

Mike M wrote:

> hey guys i have a Sony 15" monitor with built in speakers and mic.  Lately, ev
ery now and then it starts to make this high pitched squeeling noise..NOT out of
the speakers, but internally somewhere.  If i unplug or press the mute button o
n the speakers, the sound still continues, and it doesnt sound like its comming
from the speakers.  The microphone is NOT CONNected so its not from that either.
.. any ideas?
>
> Send someone a cool Dynamitemail flashcard greeting!! And get rewarded.
> GO AHEAD! http://cards.dynamitemail.com/index.php3?rid=fc-41

1999\11\06@200624 by Aaron Hammett

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In a message dated 11/6/99 2:09:54 PM Central Standard Time,
spam_OUTelektrikmanTakeThisOuTspamDYNAMITEMAIL.COM writes:

> hey guys i have a Sony 15" monitor with built in speakers and mic.  Lately,
> every now and then it starts to make this high pitched squeeling noise..NOT
> out of the speakers, but internally somewhere.  If i unplug or press the
mute
> button on the speakers, the sound still continues, and it doesnt sound like
> its comming from the speakers.  The microphone is NOT CONNected so its not
> from that either... any ideas?
>

 Yeah, it's your flyback transformer. If it's not doing it all the time, it
just may be a bit loose on the circuit board. If you're brave enough, pop the
cover off and squirt a bit of silicone around the base of the it. (It's a
black rectangular box with a red or black HV wire coming straight out of the
top and connects to the CRT). You can also run the monitor and wiggle the
transformer before gooping it up. Don't touch anything else if you're not
familiar with the spots where HV can be. Otherwise send it for service.
 If it's doing it all the time, there are loose windings around the core
internally. If you can stand it (yeah right), you can let it go till it fails.

Aaron

1999\11\07@071002 by Nigel Goodwin

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In message <.....199911062003.PAA12467KILLspamspam@spam@fiver.freemessage.com>, Mike M
<elektrikmanspamKILLspamDYNAMITEMAIL.COM> writes
>hey guys i have a Sony 15" monitor with built in speakers and mic.  Lately,
>every now and then it starts to make this high pitched squeeling noise..NOT out
>of the speakers, but internally somewhere.  If i unplug or press the mute butto
n
>on the speakers, the sound still continues, and it doesnt sound like its commin
g
>from the speakers.  The microphone is NOT CONNected so its not from that
>either... any ideas?

I see someone else suggested it could be the LOPTX whistling, this is
certainly one possibility, but Sony TV's (and I presume monitors as
well!) have a fair number of chokes and inductors in the LOPT stage, it
can often be caused by one of these rather than the transformer.

As has also been mentioned, you need to be careful when working with
monitors/TV's due to the high voltages used, but to locate the actual
fault you will need to run the monitor with the back removed and
physically 'prod' the various coils, seeing which ones causes/stops the
fault when touched. To do this use an insulated tool of some kind, a
plastic tube or even an empty ball-point pen is suitable. Once you've
located the particular coil, try and secure the windings in some way
with glue, the usual white woodworking glue (Evostick in the UK!) is
quite suitable for this.

If you don't feel confident, get someone experienced to do it - better
safe than sorry!. Also, if the noise isn't too bad, just ignore it -
it's rarely a symptom of anything breaking down.
--

Nigel.

       /--------------------------------------------------------------\
       | Nigel Goodwin   | Internet : .....nigelgKILLspamspam.....lpilsley.demon.co.uk     |
       | Lower Pilsley   | Web Page : http://www.lpilsley.demon.co.uk |
       | Chesterfield    | Official site for Shin Ki and New Spirit   |
       | England         |                 Ju Jitsu                   |
       \--------------------------------------------------------------/

1999\11\07@183619 by Michael Lee

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----- Original Message -----
From: Mike M <EraseMEelektrikmanspam_OUTspamTakeThisOuTDYNAMITEMAIL.COM>
To: <PICLISTspamspam_OUTMITVMA.MIT.EDU>
Sent: Saturday, November 06, 1999 8:03 PM
Subject: Monitor making high pitched noise


That'll be the Line o/p transformer!

Congrats on having excellent hearing!  : )

1999\11\10@010618 by Eric Richards

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Hi
About the same time you read this I will also be pulling out of the PIC
Group

Because of the Email you can read below

It was NOT my choice to avoid not putting (OT) in the subject line, I was
just replying to a Email I received and trying to be helpful, I feel
insulated that you should bring it to my attention in this manner

Because of the number of Email Volume I aviod not to overload other Email
box , with new subject items that are not related to PIC'S

Maybe you should have words with the rest of the group


{Original Message removed}

1999\11\10@080422 by Fansler, David

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Eric - I hope you have stayed on the list long enough to receive this email.
There will always be people who feel they need to chide others for not
following rules to the letter.  Just ignore such comments (hard to do
sometimes - especially when they have been directed directly at you).  Stay
and enjoy the list.

David V. Fansler
Network Administrator
TriPath Imaging, Inc. (Formerly AutoCyte, Inc)
336-222-9707 Ext. 261
@spam@dfanslerKILLspamspamautocyte.com <KILLspamdfanslerKILLspamspamautocyte.com>
Now Showing! http://www.mindspring.com/~dfansler
<http://www.mindspring.com/~dfansler>   Updated September 23, 1999


               {Original Message removed}

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