Iphone 13 Pro Max black screen
After trying all the Apple suggestions I took it to Apple store. They said no water damage, no user damage but I needed an exchange at ~ $650.
Took to another shop and they said the primary power line is shorted inside. Fixed $150.
I see hundreds of these issues listed in support. Maybe Apple should admit to a mfg. issue.
iPhone 13 Pro Max, iOS 18