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on your main screen you should see a volume icon click it then select loud then when it says active (out to the side) scroll down click advanced then click loud and scroll down to phone for your call tones select it then go to volume in holster select it then select high and then scroll to volume under out of holster and select it then select high
have you tried a hard reset? Todo a hard reset, First press and hold the power button, while holding the power button use the tip of the stylus to gently press and release the reset button. wait for the logo to appear then release the power button. when you see the message that warns you about erasing all of the info on your hand held press up on the 5way navigator to finish the reset
Obviously it's crosstalk from the supply for the LCD backlight supply into the audio amp...it's odd, because the supply should feed LEDs rather than a CF...but I'm thinking maybe a label in the phone got wet and is conducting your whine over to the audio bits. The general solution is to crack the case, find the audio circuits, and make sure there is no deposit linking the areas such as from water condensation, spilled coffee, soaked label, etc. You can hear when you've fixed it!
Is your speaker making this high pitched sound or is it something else.
If it's "something else" then there is no problem to worry about. It's just an audible frequency given off from the touch screen.