iPhone 7 with AUdio IC issue
Use voice memo app to test, the app failed
disassemble the motherboard for fixing
De-soldering the audio IC chip
Clean the pads
One pin pad on the right bottom is detached from the motherboard.
This pad is NC, we don't need to take care of it
We will wire this pad
Solder the capacitor back on position
Wire the pad
Clean the solder paste
Apply some PCB oil and use UV light to dry it
Reball the Audio IC chip
scratch the oil off for soldering the chip
Solder the audio IC chip back on motherboard
Clean the soldering paste
Assemble the phone for testing
Waterproof seal
Now voice memo is working, the Audio IC issue is fixed
Thanks for watching