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| Pin | Name | Function | |-----|------|-----------| | 1 | VBUS | +5V (Charging power) | | 2 | D- | Data line negative (USB 2.0) | | 3 | D+ | Data line positive (USB 2.0) | | 4 | ID | Identification / On-The-Go (OTG) | | 5 | GND | Ground (0V) |
| USB-A Pin | Micro-USB Pin | Wire color (typical) | |-----------|---------------|----------------------| | VBUS (+5V) | Pin 1 (VBUS) | Red | | GND | Pin 5 (GND) | Black or bare | | No wire | Pin 2 (D-) | Leave unconnected | | No wire | Pin 3 (D+) | Leave unconnected | | GND (shorted) | Pin 4 (ID) | Connect to GND inside the micro-USB plug. | Solder a jumper wire from Pin 4 (ID) to Pin 5 (GND) inside the micro-USB connector housing. This pulls ID low, signaling the phone to accept charging. Without this connection, the Nokia 105 RM-908 will not charge from many power sources. B. Factory Flash / Data Cable Wiring To enter flashing mode (using Nokia’s proprietary tools like Phoenix Service Software or ATF Box), both D- and D+ need specific connections, usually via a USB-to-serial converter or a "USB to UART" adapter. Nokia 105 Rm 908 Usb Pinout
| Phone test point | USB-TTL Adapter | |-----------------|-----------------| | TP-51 (RX) | TX (3.3V) | | TP-52 (TX) | RX (3.3V) | | GND (any ground) | GND | | Pin | Name | Function | |-----|------|-----------|
The Nokia 105 (model number RM-908 ) is legendary for its durability, month-long battery life, and ultra-simple functionality. As a classic feature phone, it lacks the complex data-transfer protocols of modern smartphones. However, when the charging port breaks, the phone refuses to power on, or you need to extract critical contacts, understanding the Nokia 105 RM-908 USB pinout becomes essential. Without this connection, the Nokia 105 RM-908 will
In most phones, pin 4 (ID) is used to detect if a USB OTG cable is attached. In the Nokia 105 RM-908, pin 4 serves a different purpose: . 3. Exact Nokia 105 RM-908 USB Pinout After analyzing the motherboard schematics (available from service manuals) and practical reverse-engineering by repair communities, here is the verified pinout for the Nokia 105 RM-908 micro-USB port.
Power the phone from its own battery. Use a terminal program (115200 baud, 8N1). At power-on, you’ll see diagnostic output. Using proprietary AT commands, you can dump phonebook via AT+CPBR=? . Q: Can I charge my Nokia 105 RM-908 with any micro-USB cable? A: No. Most modern cables leave pin 4 floating. You need a cable with pin 4 tied to ground, or use the original Nokia charger (which internally shorts ID to GND). Q: Why does my PC recognize a “Nokia USB Device” sometimes? A: If you short D+ and D- together or apply 5V to them, the phone can enter “test mode” – but no user data is accessible. It’s a diagnostic state only. Q: Is the pinout the same for Nokia 105 DS (RM-908 dual-SIM)? A: Yes, identical. The dual-SIM variant uses the same PCB layout and USB pinout. Q: I soldered a new port, still no charge. What next? A: Check the 10kΩ resistor between pin 4 (ID) and ground. It may be damaged. Also verify the charging IC (usually a small 6-pin IC near the USB port) is getting VBUS. 9. Conclusion The Nokia 105 RM-908 USB pinout is simple but non-standard. Its reliance on pin 4 (ID) for charging detection and the absence of functional data lines on D+/D- make it unique among micro-USB devices. By understanding that pin 4 must be grounded, and that pins 2/3 are only for factory flashing, you can repair, modify, and even recover data from this rugged feature phone.
The key to unlocking repair and diagnostic functions lies in understanding the of that micro-USB port. 2. The Standard Micro-USB Pinout (For Reference) To understand the RM-908, we must start with the standard micro-USB specification. A typical micro-USB connector has 5 pins: