This app was mentioned in 2 comments, with an average of 6.00 upvotes
https://play.google.com/store/apps/details?id=at.spidin.whitescreen
Install that and open it
It just turns the screen white at full brightness, if there's any burn in that's where you'll see it
https://play.google.com/store/apps/details?id=at.spidin.whitescreen
Install that and open it
It just turns the screen white at full brightness, if there's any burn in that's where you'll see it