Here's the solution that shows the connection of the Nokia 3720 classic volume control button switches.
You can use this solution if the said button switches are not working or if you need a jumper solution.
The volume up and volume down button switch is also connected to other numeric keys. You can trace each of the volume switches to the certain keys where it is also connected. Refer to the solution below to locate which test spots you can check and trace or apply a jumper if the said volume control switches doesn't work.
The volume switches are also connected to the keypad EMI filter. If the keys where a volume switch is connected also doesn't work, it means that the possible faulty is the keypad filter IC.
You can use this solution if the said button switches are not working or if you need a jumper solution.
The volume up and volume down button switch is also connected to other numeric keys. You can trace each of the volume switches to the certain keys where it is also connected. Refer to the solution below to locate which test spots you can check and trace or apply a jumper if the said volume control switches doesn't work.
Nokia 3720c Volume control, keypads and filter IC Jumper ways track
The volume switches are also connected to the keypad EMI filter. If the keys where a volume switch is connected also doesn't work, it means that the possible faulty is the keypad filter IC.
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