Replace the damaged or malfunctioning handsfree speaker in iPhone 7, and fix the speaker or other audio output problems.
Speaker / speaker three major faults?
It can be solved by replacing the loudspeaker / RA in the following cases
1. Playing music without sound / low sound / hoarse noise, etc
2. The incoming call sound is small / no ringing / noise, etc
3. There is no voice on the other side of the handsfree call