Screen not working properly
Tuch screen not working properly
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Start here:--> If the screen isn’t working on your iPhone or iPad - Apple Support
If the issue persists, 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