Chosen Solution

I have black areas inside the screen after i drop it … The outter glass is okay and the touch works well

Replace the LCD panel. The black is the cracked LCD. But if your screen is laminated (if there is an obvious gap between the display and the glass) you need to get the LCD with the glass on it.

Use this screen replacement guide up to step 13 to only remove the LCD: Dell Inspiron 13-7359 Screen Replacement