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Message:I believe that the Clie uses an electroluninesent (EL) backlight. It is normal for the circuity that drives the backlight to emit a slight buzzing sound. Note also that these types of backlights generally do have a limited service life. In normal useage you should not have any problems. However if you turned on the backlight and left it on permanently, it would gradually fade away and become dimmer until it provided no backlight at all. That is one of the reasons that devices with this type of backlight always have a timeout to turn off the backlight after a certain period of inactivity.
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