Question about Think Computer GEM 15 Inch LCD BLACK NONTOUCH MONITOR [ymon-15-0-glb]
A high-pitch squeal is common in CRT TV sets and monitors. I've never run across this in an LCD monitor, but there's a first time for everything. If the sound isn't coming through built-in speakers (if this model has them) and is being caused by the computer, I would suspect the inverter circuitry. This provides power for the backlight, and there are transformers that may have become noisy. Because of their construction, it's possible for them to vibrate internally, and at a frequency that you hear as the high-pitched noise. There isn't a lot you can do to quiet them. When I worked on TV sets, I had mixed success using hot-melt glue to muffle the noise, but usually the only way to completely cure the problem was to replace the parts. It's unlikely you'll find the parts available for a monitor, so all I can suggest is to bear with the noise as long as the monitor is otherwise working properly. Or use this as an excuse to buy a new LCD monitor; they are quite reasonably priced these days.
Posted on Feb 16, 2011
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