Screen not responding

Was the charge conducted via 'Qi - wireless' charging; or

USB; or from another power supply, such as a computer?

Screen's symptom might directly be due to Charger; or Not.

• How to wirelessly charge your iPhone - Apple Support

//support.apple.com/en-us/HT208078

Learn what to do:

• If your iPhone won't turn on or is frozen - Apple Support

//support.apple.com/kb/HT201412

• If your iPhone or iPod touch won't charge - Apple Support

//support.apple.com/en-us/HT201569

..Various details apply, in each different scenario.,

Good luck & happy trails!☺︎

Should you have an authentic Apple originated replacement/new

cable to test ~ may be helpful to further troubleshoot the matter.

Then one could also take the iPhone and cable(s) in for inspection

[genius] to see if the problem resides within the iPhone port itself.