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Original post by: pollytintop ,

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If giving the jack a darn good clean/inspection, and doing the same for the dock gives you no joy in the sound department, then you could try replacing just the dock to fix the mic and external speaker problem.replace the headphone jack for the static. both these repairs are fairly cheap, the headphone is a bit more troublesome to replace though.

I think though that the problem will be on the motherboard- there have been several postings on here about damage to capacitor ?? near connection 4 which causes static to be heard.

http://forum.gsmhosting.com/vbb/f631/iphone-3g-microphone-not-working-1129780/

http://www.ifixit.com/Answers/View/31164/I+broke+a+little+capacitor+near+connector4%3A+Where+to+buy#answer31930

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