When repairing the charging port on the Nokia 105 RM-908, you need to know which copper pads on the motherboard correspond to the 5 pins of the micro-USB connector.
Turn off power, switch the multimeter to Diode Mode, place the Red probe on GND, and the Black probe on Pin 1 . You should see a reading between 400mV and 700mV . A reading of 0.00 indicates a direct short circuit in the charging IC or protection zener diode. A reading of 1 or OL indicates an open loop/broken trace.
The transmit and receive lines for serial communication. GND: Ground.
The Ultimate Nokia 105 (RM-908) USB Pinout & Hardware Repair Guide Nokia 105 Rm 908 Usb Pinout
When looking directly at the face of a micro-USB port (with the wider side at the bottom), the pins are numbered : Pin Number Wire Color (Standard) Description / Function in RM-908 Pin 1 VCC / VBUS +5V Charging Power Input Pin 2 D- / Data Minus Negative Data Line (Flashing/Unlocking) Pin 3 D+ / Data Plus Positive Data Line (Flashing/Unlocking) Pin 4 ID Black/None Identification Pin (Often NC/Ground in this model) Pin 5 GND Ground / Negative Terminal Nokia 105 RM-908 USB Pinout & Jumper Ways
This article will dissect the pinout, provide soldering schematics, and offer advanced repair techniques.
Used for USB communication (limited support on RM-908). When repairing the charging port on the Nokia
is a relic of a time when phones were built to be simple, and "connecting to USB" meant taking the whole thing apart.
In many repair scenarios, the physical pads on the motherboard are ripped off due to rough use. A technician doesn't just replace the port; they perform "jumpering"—using tiny copper wires to bridge the gap between the Micro-USB pins and the remaining copper traces on the PCB.
| Aspect | Detail | |--------|--------| | Data transfer | No mass storage mode; only low-level flashing | | Charge via USB | Possible if you connect 5V to DC jack or to TP3+TP4 (not recommended) | | Cable availability | Pre-made "Nokia USB cable for RM-908" does exist — DIY only | | Risk | Soldering to test points can short and damage phone | A reading of 0
To ensure clean, strong electrical connections.
The Nokia 105 (Model RM-908) is a classic, durable feature phone. Because it lacks a native micro-USB port for data transfer, flashing the firmware or recovering data requires direct access to the motherboard. Technicians must connect directly to the hardware test points.
A: The CA-189 is a charging-only cable (no data lines). It has a standard micro-USB pinout (only pins 1 and 5 connected). It will work perfectly for charging the RM-908.
is taken to a repair shop where a technician uses those hidden gold pins under the battery to "re-flash" the device back to life. In short, the Nokia 105 RM-908
