What is Included on the Sub-Board?
Replacing the charging flex generally swaps out multiple failing components at once because it functions as an all-in-one lower board. It houses:
- Micro-USB Dock Interface: The physical port that receives the power cord.
- Main Microphone: The audio component responsible for capturing your voice during phone calls.
- Audio Jack Interface: The standard 3.5mm physical plug-in terminal for wired headphones.
- Antenna Signal Pass-throughs: Copper contact points that connect the main logic board to the signal receiver.
Installation Warning
Mobile hardware providers note that this module requires precise teardown and delicate handling. Unless you have professional repair experience and specialized phone opening picks, it is highly recommended to hand the component over to a professional repair technician to avoid damaging internal ribbons or tearing the battery glue.





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