"Black shadow top right corner"に関する回答Could installing a defective screen and powering up the phone cause this? A replacement screen would not light up at all... defective. The replacement for the replacement works fine but for the darkness in the upper right of the screen. Identical to the OP's picture. I'm pretty darn careful about disconnecting battery before pulling a screen, so I don't think that was the cause. Anyway, thanks for reading.