Chosen Solution
I have changed my screen I didn’t disconnect the battery before I did it and the BackLight isn’t working on the new screen. But when i put my old screen on its Completely fine.. I honestly need Help.
You have done all the troubleshooting steps to properly identify that the problem is with the backlight circuit on the logic board. However, repairing the BL circuit requires a micro-soldering so unless you have the proper tools or experience, this is not a feasible DIY repair. Generally, the problem is with the backlight filter (FL4211) but the damage can also extend to the entire circuit (U4020). Your best bet is to find a shop that does micro-soldering in your area.
