Maybe the OLED was burnt , due to extensive usage like gaming non-stop + high brightness level, no ?

You are not alone. Seems the purple smudges are common on most Samsung smartphone AMOLED display.

Try this keywords on Google search bar : purple smudges on screen .

P. S : Yet Samsung user still proud with their AMOLED display 😛. I'm not directing to you TS, so no offence please.

This post has been edited by QWERTYUIOP12: Jan 14 2018, 11:09 AM

Sorry to hear about that.

Anyway, you can try as the video here :
https://youtu.be/nCm7RdBBYKk

Perhaps yours J7 Pro display still have hope to be save without you need to pay for the repair .

This post has been edited by QWERTYUIOP12: Jan 14 2018, 02:15 PM