Nokia N8 have two mic one is know as primary microphone which is used for normal calls and the other one is for video calling that is known as video microphone. to solve these two mic problem in Nokia N8.
If you have a Nokia N8 dead they may can have a power switch on off problem so please in first step plug in a charger and if Nokia N8 is charging proper and well but not getting on it means the main problem can be power switch on off fault.
To solve ringer problem in Nokia N8 you can try this diagram that is posted with this post ringer have +v an -v so both of these path can find in diagram on is in red color while other is in blue
If you are facing volume key problem in Nokia N8 and you can not volume up or volume down in Nokia N8 then here is diagram that will help you to solve this problem in Nokia N8 this diagram is posed bellow.
If keyboard does not work in the Nokia 6600s slide can be solved with this scheme, which is attached to this post, all keys are defined with different colors and all the keys.
Nokia 6600s slide LCD led display light problem can be solved with following these tips and trick as given in this post and also a diagram as attached.
This is a diagram to solve display problem in Nokia 6600 slide. In this problem solution we can do a few steps. In first step we may have to check is LCD panel good and ok.