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Samsung M21/M31 Charging Board
The Samsung Galaxy M21 (SM-M215) and Galaxy M31 (SM-M315) utilize a nearly identical internal architecture for their lower sub-assembly. This Charging Board (Sub-PCB) is a crucial multi-functional module that acts as the gateway for power, data, and audio communication.
Below is a technical breakdown and product description in a tabular format.
Product Overview: Samsung Galaxy M21 / M31 Charging Board
| Feature | Detailed Specification |
| Compatible Models | Samsung Galaxy M21 (SM-M215F), M31 (SM-M315F), M30s (SM-M307F) |
| Component Type | Sub-PCB / Charging Port PCB Module / CC Patta |
| Connector Type | USB Type-C 2.0 (High-durability reversible port) |
| Fast Charge Support | Supports 15W Adaptive Fast Charging |
| On-Board Hardware | USB-C Port, Primary Microphone, Antenna RF Terminal, Audio IC path |
| Main Functions | Charging, Data Sync (OTG Support), Voice Input (Call Mic), Signal Reception |
| Material | Multilayer Fiberglass (FR-4) with precision gold-plated terminals |
| Connection Method | Main Flex Connector (ZIF/BTB) + Coaxial Antenna Snap-on |
| Safety Features | Integrated NTC Thermistor for temperature monitoring and OVP (Overvoltage) |
Key Technical Attributes
1. Adaptive Fast Charging Support
This board is fully compatible with Samsung’s 15W Adaptive Fast Charging protocol. High-quality (Full IC) versions include the necessary resistors and controller chips to communicate with the original Samsung wall charger, ensuring the "Fast Charging" notification appears on your screen.
2. Digital Audio & Microphone Integration
The Primary Microphone is pre-soldered onto this module. It is a MEMS (Micro-Electro-Mechanical System) component designed to capture high-definition voice input while ignoring ambient background noise. Replacing this board is the primary fix for callers not being able to hear you.
3. Signal Integrity & Antenna Bridge
The board features a gold-plated RF Connector that acts as a bridge for cellular and Wi-Fi signals. In premium "Full IC" versions, the board is populated with all components required to maintain maximum signal bars even in low-reception areas.
| Weight |
0.007 |
|---|
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