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Sometimes High pitching its just that, static on the area, like if you are near a microwave, or near other electronic equipments, but, if the skreetching sound keep going or even if you do nothing it could be a line inside the sound card, or you need to clean the volume botton with special electrical cleaner. other that these, its contacts, or bad cap for the volume board inside.
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.
my theory is based upon 1st hand knowledge with a newer EPA compliant freestanding wood burner, with the air-tight and high efficiency ratings. its possible that its just the high rate of air moving through the air chambers , similar to a organ pipe.
I have a Mac (OS X 10.5.7) and had the same problem with the Ion TTUSB system picking up room noise. This seemed to fix it:
In System Preference, under Hardware, choose "Sound".
Under "Choose a device for sound input" choose USB Audio CODEC type: USB