Nokia 3720C Volume Up and Volume Down switch control from the middle button Here is the solution shows the connection of the classic Nokia 3720 switch volume control knob. You can use this solution if the switch button does not work or if you need a bridge solution.
The volume button and the volume down switch is also connected to other digital keys. You can follow each of the volume switches some keys which is also connected. See the solution to locate the test points, you can check and follow or implement a bridge if those switches, volume control does not work. The volume switches are also connected to the EMI filter pad. If the key switch volume where no work is also connected, means that the failure is possible keyboard filter IC.
The volume button and the volume down switch is also connected to other digital keys. You can follow each of the volume switches some keys which is also connected. See the solution to locate the test points, you can check and follow or implement a bridge if those switches, volume control does not work. The volume switches are also connected to the EMI filter pad. If the key switch volume where no work is also connected, means that the failure is possible keyboard filter IC.
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