Nokia 5310 Display Light Solution Jumper Ways
https://gsmfixer.blogspot.com/2015/08/nokia-5310-display-light-solution.html
Display light problem occur in almost every mobile and in Nokia 5310 it may be occur due to LCD problem or water damage so clean the board with original thinner or CTC and confirm that your LCD is working fine.
If the problem in not solved then apply the hardware repair diagram to solve Nokia 5310 display/lcd light problem by making jumpers as mentioned in the diagram.
If the problem in not solved then apply the hardware repair diagram to solve Nokia 5310 display/lcd light problem by making jumpers as mentioned in the diagram.