If cleaning and jumpers do not restore function, the problem may lie in a faulty component:
This guide is for educational and repair purposes only. Performing hardware repairs carries a risk of damaging the device. Proceed with caution. nokia 105 rm 908 keypad ways
Clean the keypad pads with IPA (Isopropyl Alcohol) to remove dust or carbon. If cleaning and jumpers do not restore function,
Always start with cleaning. If cleaning fails, trace the specific dead row or column with a multimeter. Use 0.1mm enameled wire for jumpers, and remember: less heat is more. With these jumper techniques, your Nokia 105 RM-908 will be texting like it's 2010 again. Clean the keypad pads with IPA (Isopropyl Alcohol)
: If the device fails to turn on despite a good battery, technicians often look for a jumper path for the on/off key Keypad Jumper Guide
Master Guide to Nokia 105 RM-908 Keypad Ways: Hardware Jumper Solutions