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Repair information and guides for the fifth generation of iPhone. Model: A1387

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Microphone and the sound does not work

I have iPhone 4s when making phone calls i cant hear them and they cant hear me. i have try putting it on loud speaker, but still no luck.

so far i have replaced, microphone, and the speaker.

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First you must try call with earphone or BT handset and if no change, the problem is probably the motherboard (audio chip) , have any tone? rings, music in the audio or video recording?? This will be very important answers.

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I have tried earphone and BT but still no sound, it does work when playing music and doing recording.

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IC audiocompailer on the motherboard

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Try replacing the dock connector. That is likely the culprit as corrosion or damage to it can cause the symptoms you are describing.

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I have tried that too but still didnt work, i think its the motherboard.

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