nokia 808 slide lock key not working
nokia 808 screen lock button problem
nokia 808 lock key jumper solution
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Check mother board for water damages and rust, if you find some carbon then apply electronics cleaner and heat with heat gun to make it dry.
Check lock switch ( if it can be pressed easily ) if it is not working remove and replace button.
Check path and track as shown in above diagram with meter and apply jumpers if required to solve the problem.