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オリジナル投稿者: David ,


Try biingyin1's tips first.

Then take a look at this image:


The bottom black piece contains the cellular antenna, you need to do two things. First make sure that little cable that runs up is fully seated into it's place(Red). You will have to unplug the battry connector. Secondly, there are several feet type things here which need to be making good contact with the frame (green). If either of these aren't put in correctly you'll have service problems.

Image by iFixit