iPhone 7 UNDERFILLED Audio IC! Yikes! It's Not As Hard As It Looks. Microsoldering Repair 

This iPhone 7 came in for routine Audio IC repair, where the speaker button is grayed out, no audio during phone calls, no audio from RU-vid, etc. I was about to get started when I noticed the Audio IC chip was underfilled, so I stopped what I was doing & came here to RU-vid to record it LIVE.
Dealing with this underfill stuff isn't that bad. Just have to know the right techniques to deal with it.
So watch how we go about fixing this issue!
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