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-----
From: Mike M <elektrikman@DYNAMITEMAIL.COM>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Sunday, November 07, 1999 9:09 AM
Subject: Monitor making high pitched noise


>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?
>
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