: 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.
If the phone won't turn on, Aris looks at the power key ways . On the RM-908, the center point usually carries the main supply from the power section, while the outer ring is often ground. nokia 105 rm 908 keypad ways
Switch your digital multimeter to . Place the black probe on a verified ground source (such as the SIM slot shield or battery negative terminal). Touch the red probe to the center pad and then the outer ring of the non-functioning key. : Technicians use a multimeter (set to "Buzzer"
Before opening the phone, verify these symptoms: On the RM-908, the center point usually carries
When a button stops working, it is usually because the connection (the "way") is broken. Keypad Matrix Components The silver disc you press.