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The wifi on my iPhone 4 is extremely poor, i only get my own connection with 1 bar if i'm next to the router.
The antenna has already been replaced, and that seem antenna was tested in an iPhone 4 where it works, what could be the solution :(?
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You probably didn't put the black cover (the emi shield that covers the top area.
Make sure you put it on and there should be a clip at the top part of the cover. You have to put a screw through this clip which will make a ground connection with the wifi antenna and boost your signal
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Maybe you forgot the tiny metal washer. It's important for wifi and GPS signals.
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I tried cleaning with isopropanol and it did not work :(, ofcourse the antenna is allright i tested it on different iPhones where it all works fine.
Frank Buurlage さんによる