How to fix iphone x black screen
Iphone x display
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Check if it is a temporary glitch, performing a "forced" restart of your iPhone with these instructions:--> Force restart iPhone – Apple Support
If the issue persists, it might be a screen problem.
Contact Apple Support directly, using this link:--> Get Support , or make an appointment and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> Apple – Location Selector
After checking it out, they'll give you all the available options.
Regards
Giulio