Weird buzzing sound from the screen of a PB G4 12"

every , then, regardless of i'm doing @ time, there weird buzzing noise, goes away either after few seconds, or if touch screen. book still useable, it's tad annoying. have or has had such symptom?

 

sounds display may going out. it's been long time since i've worked on these i'd guess either backlight or inverter.

http://www.ifixit.com/guide/install...num-12-inch-1-1-5-ghz-display-inverter/2180/1

 

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