Nokia C1 display light problem

Fault description:

Nokia model C1 sometime had a strange problem that we can’t see display back light on LCD. This problem occurs due to problem in LCD or sometime in LCD IC and track missing from display transistor to LCD connector. 

Fault solution:

For quick solution of this problem we have to use following methods:

1.       First try to restore mobile factory setting using code *#7780# then mobile will

Restore in its factory value because sometime due to some setting mismatch we got this error.

2.       Secondly we have to use hardware methods so use next step.

3.       Open mobile and apply new lcd to mobile and check for solution 

4.       If no solution then we have to use jumper from lcd track first to a point on back side of pcb because that first connector receive current from that point and due to some internal crack in track print line miss there so apply following jumper there.  

                                                                 This is LCD connector side

And this is PCB back side

These methods will solve our problem and we will get our solution.

Conclusion:

During jumper setting process we should take care that jumper wire should not touch any component or not grounded.