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.
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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.
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