Chosen Solution

I’ve replaced the screen on a friend’s 6S but now it’ll only turn on by booting/ rebooting - it won’t turn on from standby using the power button/ for incoming calls. I’ve updated to the latest version of iOS but the issue is persisting. Has anyone had a similar issue?

You’ll need to double check your work to see if ou didn’t accidentally damage any flexes or connectors. Pay particular attention to the Power Button Flex (check out this guide to see it).