To identify where a connection is broken, use a multimeter set to .
Failed series resistors or capacitors along the keypad lines can disrupt the signal. nokia 105 rm 908 keypad ways
Often connected to a ground or a different signal group. To identify where a connection is broken, use
Locate a working point on the same line (often a test point on the back of the board or a series resistor). breaking the electrical connection.
Moisture can cause corrosion on the copper pads, breaking the electrical connection.