Samsung S4 i9505 Display Light Problem Solution Jumper Ways
Samsung S4 i9505 display light not working,
Samsung S4 i9505 Display light jumper solution,
Samsung S4 i9505 blank display.
If you have complete above steps and can not solve light problem in Samsung S4 i9505 then dis assemble the mobile phone and look at mother board for water damages and broken parts.
Make clean mother board with electronics clean and apply hot air with heat gun to make it dry.
check all these parts and components with meter and if any of them is not working then apply jumpers as given in above diagram.