Nokia 105 Rm 908 Usb Pinout May 2026

This is why a standard USB cable plugged into a computer or even some USB chargers may not charge the Nokia 105 RM-908 – the phone does not see the ID pin pulled low correctly.

Most generic micro-USB cables do not connect pin 4 (ID) to anything. To make a reliable charging cable for the Nokia 105 RM-908:

Wiring (from USB-A male to Micro-USB male):

| 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. | Nokia 105 Rm 908 Usb Pinout

Crucial: 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.

If you are simply trying to repair the charging port (to charge the battery) and not connect to a PC, you do not need the data pins. You only need to solder a new Micro-USB or USB-C female port to the VBUS and GND legs of the original charging connector block on the bottom of the phone. This is why a standard USB cable plugged

           ┌─────────┐
        ┌──┤ 1  2  3 ├──┐
        │  │ 4  5    │  │
        │  └─────────┘  │
        └───────────────┘
Pin 1: VBUS (Red)
Pin 2: D-   (White)
Pin 3: D+   (Green)
Pin 4: ID   (NC / GND via resistor)
Pin 5: GND  (Black)

The Nokia 105 (RM-908) uses a standard Micro-USB pinout with Pin1 = VBUS, Pin5 = GND, Pin2/3 = D+/D-. Data lines are physically connected to the main processor but are not enabled for user data transfer in the stock firmware. The USB interface is fully functional for service flashing and charging only. Most generic micro-USB cables do not connect pin

For repairs or DIY cable making, follow the standard Micro-USB pinout above — no special Nokia-specific wiring is required.

Report prepared for: Hardware repair / reverse engineering reference
Accuracy: Based on RM-908 PCB traces and Nokia BB5 architecture

| Symptom | Likely Cause | Pinout Check | |---------|--------------|---------------| | No charging | Broken VBUS or GND trace | Measure continuity pin1 → charging IC | | PC not detecting phone | D+/D- not connected to CPU | Check series resistors (22Ω typical) | | Phone shows "USB connected" but no function | Firmware limitation | Not a pinout issue | | Overheating while charging | Short between VBUS and ID or GND | Inspect pin4 (ID) – should not be shorted to VBUS |

The Nokia 105 (RM-908) is an entry-level feature phone. Unlike smartphones, it does not possess a standard micro-USB or USB-C port accessible from the exterior. Connection for firmware updates or servicing is achieved via "Jumper" points on the motherboard. These connections are typically used by technicians for: