iPhone 6 plus facetime, quay phim cam trước mất mic 2018
step 1: measure the resistance at mic 3 bias line, if lost -> check the wire (yellow frame).
step 2: Data mic line cross capacitors, so measure the resistance at the IC output. Measure to clear circuit up to socket with another side of IC. If you doubt it -> replace the capacitors (orange frame), do not remove.
step 3: the capacitors (purple frame) if shorting -> remove.
step 4: Mic was cracked -> replace the filter capacitor (orange frame).
step 5: replace audio code.
note: we found that replace front camera line was done, or heavier damage was pilling off supply voltage Mic bias wire (yellow frame) near socket -> scrape and join it together.
step 2: Data mic line cross capacitors, so measure the resistance at the IC output. Measure to clear circuit up to socket with another side of IC. If you doubt it -> replace the capacitors (orange frame), do not remove.
step 3: the capacitors (purple frame) if shorting -> remove.
step 4: Mic was cracked -> replace the filter capacitor (orange frame).
step 5: replace audio code.
note: we found that replace front camera line was done, or heavier damage was pilling off supply voltage Mic bias wire (yellow frame) near socket -> scrape and join it together.