My iphone will not record sound although I gave microphone access to all necessary apps , it blurs out the sound button on videos captured using the phone however other videos that were not recorded using this phone produce sound.
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You have the symptoms of what is called "Audio IC disease" it plagued the iPhone 7 and 7 Plus. To repair it would require microsoldering and micro jumpers under the audio IC.
I would look into a repair shop that specializes in this kind of micro soldering repair - and back up your data first just to be safe.
Not sure if its ok to post this here because it is my page - but under the audio IC, these are the jumpers that are normally run, before soldering the IC back on.
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