the hdmi to tv adapter worked until friday and quit working after they put an update to 16.1

After ANY iOS/iPadOS upgrade/update, you should ALWAYS perform a simple hard reset of your Apple mobile device.

For iPad models with a Home button, do a simple hard reset/forced restart of your iPad by holding down both the Home and sleep/wake/power button simultaneously until your iPad goes to black and restarts with Apple logo, then release the buttons.

OR

For much newer design iPad models, without a Home button, try the new simple hard reset/forced restart procedure for the new 2018-2022 iPad Pros, 2020/21 iPad Air 4 and 5 and 2021 iPad Mini 6 models.

1. Press and release the volume button closest to the top Power button

2. Then immediately press and release the volume button farthest from the top Power button.

3. Then, press and hold the top single sleep/wake/power button You will see the Slide to Power off button, but keep on holding down the power button until you see the Apple logo, then let it go.

Once you have performed all the steps, wait for a few seconds and your 2018-2022 iPad will boot up completely to the iPad’s Lock screen.

Best of Luck to You!

If you have this same problem, please give your feedback to Apple.

Product Feedback - Apple

They will only fix the bug in upcoming iPadOS versions if they receive enough complaints about the issue. That’s what I’ve been said by Apple Care support staff.

There appears to be more and more Apple Support community postings on this issue.

Apparently, there is a problem with all Apple HDMI video adapters on iPadOS 16.1.

Hopefully, Apple will, soon, fix this issue, in a future iPadOS 16 update.

In the meantime, you can post unacknowledged iPad/iPadOS feedback, on this issue, with Apple by tapping the link below.

Feedback - iPad - Apple

Exactly same thing here with my iPad Air 4th gen! My USB-C to HDMI adapter stopped working right after updating to iPadOS 16.1.

I even tried restoring my iPad to factory settings but it didn’t work either.

Hope this is fixed in the next iPadOS version release.

Finally with iPadOS 16.2 it’s been fixed!