I recently repaired my iPhone and now I have really sucky signal. I tried cleaning the contact clip and the fingers of the cell antenna but I still have very bad signal. I am not sure if my iPhone needs a new contact clip, cellular antenna, or a logic board. (I can't solder an iPhone induction coil even if my life depended on it.)
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What did you do for the repair?
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I had to replace the backing and the home button.
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Make sure the fingers of the antenna are pushed down and making contact with the frame!
If that fails I would try a new one to rule out a fault part..
Failing that you have damage the logicboard in some way
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