Usually not connected (NC) or tied to ground in feature phones.
The RM-908 version of the Nokia 105 utilizes a standard 5-pin micro-USB layout for power delivery. While the physical port exists, the internal hardware routing is simplified compared to "smart" devices.
The essential ground connection that completes the electrical circuit. The Repair Story: A "Jumper" to the Rescue
The is simple, standard, and forgiving. While the micro-USB port might fail mechanically, the underlying PCB test points provide a robust solution for extending the phone’s life.
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. Nokia 105 Rm 908 Usb Pinout
The Nokia 105 (model designation ) is legendary in the world of feature phones. Launched in 2013, it boasts exceptional battery life, a rugged build, and surprising durability. However, like any electronic device, its micro-USB port is vulnerable to physical stress, corrosion, or simply wearing out after years of use.
Often unused in basic feature phones but sometimes distinguishes between host/slave modes.
The copper test points on the Nokia 105 motherboard can easily lift off the board if subjected to excessive heat. Do not hold the soldering iron on the pad for more than 1 to 2 seconds.
Understanding the Nokia 105 (RM-908) USB Pinout: A Complete Guide for Repair and Data Recovery Usually not connected (NC) or tied to ground
Because the RM‑908 does not support USB data, advanced operations such as reading/flashing firmware, resetting security codes, or performing factory resets require an alternative interface known as (Fast BUS). FBUS is a serial communication protocol used in many older Nokia DCT4 phones. It uses a dedicated set of pins on the phone’s internal connector, typically located under the back cover, often near the SIM card holder. For the RM‑908, the exact contact points are well documented in servicing communities.
Nokia 105 (RM-908) holds a unique place in mobile history as one of the last bastions of ultra-simple, durable feature phones. Released in 2013, it was designed for basic utility, yet it became a favorite for hardware enthusiasts and repair technicians due to its straightforward internal architecture. The Story of the RM-908 Pinout
For the RM-908 specifically, if the charging indicator won't show, technicians often bypass faulty integrated circuits (ICs) by running a direct jumper from the VBUS pin to the charging capacitor. Common Recovery Scenarios
The Nokia 105 (RM-908) is a classic feature phone that does not feature a standard external micro-USB or USB-C port for data transfer or flashing. Instead, it utilizes a specialized internal located under the battery. These pins are primarily used by technicians for firmware flashing, unlocking security codes, or repairing "dead" software issues using specialized boxes like Infinity BEST or Advance Turbo Flasher (ATF). Nokia 105 (RM-908) FBUS USB Pinout Solder a jumper wire from Pin 4 (ID)
The pins are typically arranged in a straight vertical or horizontal line depending on the specific motherboard revision. Below is the precise mapping from a standard sliced USB cable to the Nokia 105 test pads: Pinout Mapping Table Motherboard Pad Label / Function USB Cable Wire Color Description Power Supply (+5V or +3.7V from battery) DP / D+ USB Data Plus line DM / D- USB Data Minus line GND Ground connection / Negative shield Alternative F-Bus / Serial Rx-Tx Pinout
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.
: Connect the phone to a computer via a service box (like Miracle Box or Infinity CM2) to fix boot loops or software bugs.
The "Life-Giver." It delivers +5V from the charger to the battery.