After dis assemble of Nokia C5-03 look at mother board and If you found some rust carbon or water damages then it can also be cause of Nokia C5-03 keys problem to solve and fix keys problem in Nokia C5-03 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 volume of keys button switch.
Check all these tracks with meter and apply jumpers. If these key switches are not working then you can replace volume and keypad lock buttons.
for more detail and new tips and tricks about cellphone service problem keep visiting this page we will update cellphone service diagrams timely with new cellphone diagrams.some related post are also given bellow you can read them also for more information about cellphone.
to get new repairing cellphone diagrams and applications with email click subscribe
Sign up here with your email
Disclaimer.We are not affiliate with cell phone companies like Nokia,Samsung,Sony Ericsson,Lg,Motorolo and some other etc Manufacturers / Vendors .All trademarks are the property of the respective trademark owners.we just provide diagrams for study and repairing purpose.these images are uploaded by website visitors.so we will not be responsible for any loss or damage, including personal injury.for more detail read Terms and Conditions and Privacy and Policies at bottom.