Why did my iPhone 13 screen go black after update?

niharmehta wrote:

After the update the screen went totally blackout. Now the screen is dead.

Thank you for clarifying. It's possible that some part in your iPhone was starting to fail and the update caused additional stress for it to fail completely and stop working.

Plug your iPhone into a wall outlet, and perform a Forced Restart. This should always perform unless there is a physical issue with the side buttons.

Force restart iPhone - Apple Support

If that doesn't work, your iPhone has a hardware issue that needs to be serviced at your nearest Apple Store Genius Bar or Apple Authorized Service Provider.

Genius Bar Reservation and Apple Support Options - Apple

niharmehta wrote: "After a auto update on my Iphone 13..."

Your iPhone 13 could be 3½ years old and the long process of applying an iOS update to an iPhone with a weak, aging battery can be the proverbial "straw that broke the camel's back." So...

Does your iPhone 13 still have its original battery?

And, if the screen comes back to life, what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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You need to have Apple perform diagnostics on your iPhone. It can be done in person at an Apple Retail Store or at an Apple Authorized Service Provider. You can also contact Apple Support and request remote diagnostics.

If you’re in the US please call  1-800-MY-APPLE or outside the US, consult the support articles below.

Contact Apple for support and service - Apple Support

Genius Bar Reservation and Apple Support Options - Apple

Explore Service Locations

Official Apple Support

Is the screen restored to normal or are you still having issues?

When you update your iPhone, it should shut off with a black screen and reboot to properly perform the update. Is that what you were referring to?