This solution may help fix and repair Nokia Lumia 520 No LCD Screen Display Backlight LED Light Problem.
Nokia Lumia 520 Display Light Not Working
Nokia Lumia 520 Lcd Light Solution
Lumia 520 Led Light Jumper Ways
If this problem happens you may then first try to install a new replacement LCD screen to ensure that the LCD LED’s caused the problem or not. if the Back light LED’s still does not work, you may then proceed to hardware troubleshooting and used this solution below.
Keep in mind if there is some rust or carbon and water damages make it clean with electronics clean and then apply hot air to make it dry
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