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There are many small Transformers and electronic oscillators in a CRT monitor which scan the electrons across the screen, blank them at the end of a line and return the beam to the left of the screen in order to start the scan again. These transformers have alternating currents flowing through them which make the ferrite cores 'chatter' at the same frequency. This frequency is about 18,000 cycles per second which makes this audible noise.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoThe rear side of the monitor may be cracked. You do not want to release the cathode, so you should turn it off.
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