I had the same issue with iPhone 7 this August. I ended up letting the battery deplete leaving it for some time and then recharging it and that helped. I couldn

I had the same issue with iPhone 7 this August. I ended up letting the battery deplete leaving it for some time and then recharging it and that helped. I couldnt brighten the screen :( because of the Apple logo being at full Brightness i was also positive its software not hardware