Physical impact or manufacturing defects can cause microscopic fractures in the solder balls beneath the Audio IC or within the microphone module itself. Identification:
On many modern phones (Xiaomi, Samsung A-series, Google Pixel mid-range), the charging port is not soldered directly to the main motherboard. It is on a small, separate connected by a ribbon cable. Phone Micro Db Crack
Before USB-C took over, we got creative: Google Pixel mid-range)