After dis assemble of Nokia C5-06 look at mother board and If you found some rust carbon or water damages then it can also be cause of Nokia C5-06 keys problem to solve and fix keys problem in Nokia C5-06 clean all the rust and carbon with electronics cleaner and apply hot air to make it dry.
In above diagram you can see some different color lines. These lines are tracks and paths of keys button switch that are used for keypad lock and voluem of keys button switch.
Check all these tracks with meter and apply jumpers. If these key switches are not working then you can replace voluem and keypad lock buttons.
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