There is a very high pitched noise coming from the monitor; shriller while reproducing dark colours. The sound intensity reduces when the monitor is switched off and switched back on but slowly grows stronger again.
Coming to think of it this sound has been always there albeit at lower intesity. Its only now, when the noise has become more shrill and painfull that I have been able to place the source as monitor.
It could be a harmonic noise caused by dust inside the monitor. If you are qualified (brave enough) to remove the back cover, blow the entire inside of the monitor out with compressed air (carefully) that may help. It could also be the flyback transformer. In that case, you would have to have the transformer replaced (I wouldn't recommend doing it yourself unless you are a TV technican as the CRT can contain a static charge of 14,000-25,000 volts- even when unplugged)
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Dec 30, 2008 - In my case, the monitor was fine for the first two months. But then started making a buzzing noise... 1) when on, 2) worse when .... my Samsung TV ismaking high pitched noises even if its turned off. I will NEVER EVER EVER ...
If it is a relatively quiet, high pitched noise, it may not even be from your speakers. I've experienced a high pitched noise whenever i plug in my AC adapter to my PSP, so there is a chance it might be power related.
High pitch sound on LC-42D62 is reproduced by switching transformers on power supply board. To correct this problem, you will need to remove power supply unit from the TV, spray all transformers with SILICONE CONFORMAL COATING. Let it dry for 12Hrs. Then install power supply unit back.
The high pitch sound is comming from a power supply transformer that will resonate (or vibrate) at the operating frequency (12-14KHz).
This is usually affordable to repair -at least worth the estimate.
According to the Samsung website: "The high pitched sound you hear is probably coming from the flyback transformer. The flyback transformer converts the relatively low voltage electricity that comes from the outlet in your home to the high voltage electricity needed to drive the cathode ray tube in your TV. It is not unusual for a flyback transformer to buzz softly when it operates. However, if the sound is loud and high pitched, it probably means the transformer is failing. To eliminate the sound, you will have to get your TV serviced."