For the Nokia 105 RM-908, the keypad is arranged in a (Rows and Columns). Each button acts as a switch that connects a specific Row line to a specific Column line.
Your jumper wire is too long and acting as an antenna, or you have a cold solder joint causing intermittent connection. Re-solder with less wire length and more flux. nokia 105 rm 908 keypad ways
: There are small resistors in series with the keypad lines. If you find a break, you can sometimes "short" (bridge) these resistors to restore the signal . Keypad Jumper Visuals For the Nokia 105 RM-908, the keypad is
Step-by-step:
: Technicians use a multimeter (set to "Buzzer" or "Continuity" mode) to test for Ground Resistance (GR) on the center points of the keys. If a point shows no reading, a thin copper "jumper" wire can be soldered from the non-working pad to a corresponding component or test point that still has a valid signal. Re-solder with less wire length and more flux