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.
He pointed to the intricate lines on the PCB, explaining that they are like roads. nokia 105 rm 908 keypad ways
If cleaning didn't help, you likely have a broken trace on the motherboard. If the connector strip (the plug that connects
The RM-908 uses a (4 rows, 4 columns) to scan 16 keys, though the phone has fewer physical keys. Unused matrix positions are left open. 4 columns) to scan 16 keys
Often, the trace breaks between the keypad contact and the protective filter.