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From: bcasper@ncsuvx.enet.dec.com (BRIAN  CASPER)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Squeeky monitor..
Keywords: SM124
Message-ID: <1991Feb3.153228@ncsuvx.enet.dec.com>
Date: 3 Feb 91 20:35:53 GMT
References: <8121@castle.ed.ac.uk>
Sender: news@ncsuvx.ncsu.edu (USENET News System)
Reply-To: bcasper@eos.ncsu.edu
Organization: North Carolina State University
Lines: 18

In article <8121@castle.ed.ac.uk>, petercl@castle.ed.ac.uk (Peter J.C. Clarke )
writes:

|>	I have a problem with my SM124 monitor. It emits a high pitched
|>squeek from around the on/off/volume switch that starts about 5 mins
|>after I have switched it on. The squeek is very loud and annoying.
|>Smacking it one tends to help for a bit but this only keeps it quiet for
|>a few minutes. Has anyone else had this problem and does anyone know how

The squeek is coming from your high voltage 'flyback' coil.  A lot of monitors
do this and it is generally a
sign of impending failure.   (although it may be years before this happens...) 
The best thing you can do
is live with it as the price/pain of replacing said coil is probably not worth
the trouble.

-Brian Casper
bcasper@eos.ncsu.edu