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When recording Videos with the backside camera I have nealy no sound, only noise. Some loud sounds are hearable, though,Videos with front camera are fineSiri can hear meTelephone calls work with and without speaker modeNo dust in the mic holes What part do I have to replace? Lightning connector?

There are three microphones on the iPhone 6. There is one for phone calls/front camera videos, one for noise cancellation and one for the rear camera. From Apple Support If audio from video recordings sounds faint, or Siri can’t hear you, make sure that the microphone near the iSight camera—on the top, back corner of your iPhone—and the receiver isn’t blocked or covered. If the rear microphone isn’t obstructed, then you need to order this one.

There are three microphones on the iPhone 6. There is one for phone calls/front camera videos, one for noise cancellation and one for the rear camera. From Apple Support To test the primary microphone on the bottom of your iPhone, open Voice Memos and tap the record icon. Then speak into the microphone and tap the play icon to play back the recording. You should be able to hear your voice clearly. If your voice sounds faint when you’re using the speakerphone on a phone call, make sure that your iPhone receiver isn’t blocked or covered. If audio from video recordings sounds faint, or Siri can’t hear you, make sure that the microphone near the iSight camera—on the top, back corner of your iPhone—and the receiver isn’t blocked or covered.See here for more info. If the rear microphone isn’t obstructed, then you need to order this one.

I had very low sound on video recording. All other sound was fine. I inspected the microphone hole on the back near the rear camera with a jeweler’s loupe and it appeared to be ‘gummed’ up. I used a Q tip and liberal amounts of isopropyl alcohol to loosen the clog and then swab it out. The audio returned perfectly. I think some liquid like soda with sugar clogged the mic.

Have done video recording from iPhone 6 back camera when checked there is no sound front camera has proper sound can I recover sound of the video recording as it and evidence important video