Origineel bericht door: Rany ,
No recourse other than lifting the screen to assess the need for additional cleaning inside the phone. As for the screen, oil sipped inside the screen, probably staining the backlight. Replacing the backlight only is possible with the right tools and skills, but not an easy DIY job since soldering is required. Otherwise, a new screen will fix this issue unless the screen is clear enough and doesn't need replacing...