Upper left corner screen not functioning

Hey ebrima163,

If the issue is only occurring on one portion of the screen, that would likely indicate a problem specific to your display. If you have a case or screen protector on your iPhone, we'd suggest removing that to see if it resolves the issue.

We'd also recommend reviewing this article for additional steps to help resolve that: If the screen isn't working on your iPhone or iPad - Apple Support

"If your screen is too sensitive or responds intermittently to touch

1. Restart your iPhone or iPad.
2. Make sure that your screen is clean and free of any debris or water.
3. Disconnect any Lightning or USB-C accessories. If your screen works after removing an accessory, try using a different outlet, cable, or charger.
4. Remove any cases or screen protectors.

Contact Apple Support

If your screen still isn't working, you might need to set up service for your device. Contact Apple Support."

Thanks!