Nokia 105 Rm 908 Keypad Ways -

If your testing indicates the keypad matrix is physically fine, the issue may be at the component level.

If the phone won't turn on, check the red-marked track for the power button. This line often runs through a small resistor near the CPU. nokia 105 rm 908 keypad ways

If prompted, the factory default is 12345 . If your testing indicates the keypad matrix is

| Keypad Button | Row Line | Column Line | Common Failure Point | Suggested Jumper From -> To | | :--- | :--- | :--- | :--- | :--- | | | R3 | C2 | Right edge of PCB near SIM slot | Button 5 contact -> C2 filter resistor | | 8 | R4 | C2 | Bottom left corner via | Button 8 pad -> R4 IC pin | | 0 | R5 | C2 | Water damage near microphone | R5 track -> CPU ball (Bottom left) | | Left Soft Key | R1 | C5 | Torn ribbon cable flex | Flex pin 3 -> Mainboard test point TP405 | | # (Hash) | R4 | C3 | Cracked solder under CPU | Direct CPU pin reball (Not recommended for beginners) | If prompted, the factory default is 12345

Nokia 105 RM-908 Keypad Ways: Troubleshooting and Jumper Repair Guide

: The keypad lines often pass through small series resistors. If a line is dead on one side of a resistor but live on the other, the resistor can be bypassed (shorted) to restore the connection.