if these buttons or a few of them are not working then you can see above diagram and check all these parts and if any of them is missing then replace it.check whole path and if any track is missing apply jumper as given in above diagram.
check strip it may can be damage also and in that case replace strip or make jumpers.
for more detail and new tips and tricks about cellphone service problem keep visiting this page we will update cellphone service diagrams timely with new cellphone diagrams.some related post are also given bellow you can read them also for more information about cellphone.
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