If keypad lock key or volume keys are not working in Nokia C5-06 It can be cause or key damages or water damages in the mobile phone.If smartphone keys are not working you can do these steps that are given in this post and diagram bellow.nokia Asha 202 Mic problem solution jumper ways
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
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