Use isopropyl alcohol to remove oxidation from the button pads.
: Each keypad line typically passes through a small series resistor before reaching the CPU. If you find a line with no value (open circuit), you can bypass or "short" these resistors to restore the connection. Matrix Groups nokia 105 rm 908 keypad ways
This guide is for educational and repair purposes only. Performing hardware repairs carries a risk of damaging the device. Proceed with caution. Use isopropyl alcohol to remove oxidation from the
If the connector strip (the plug that connects the main board to the keypad board) is loose or the pins are broken, you must jumper directly from the connector pins to the test points. nokia 105 rm 908 keypad ways