It should work and Av is used for audio only.
If you Google your TV manufacturer/support, they may be able to help you.
https://curtis-sylvania.com/manuals-downloads. If you go to that site, there is a 3 bar icon on the top right hand side. Click on that and support is in the sub menu.
When you select hdmi settings hdmi 1, try rebooting your minix and see if it picks up the Hdmi when it restarts.
Again, try in tv settings and look for external inputs. Click on that and see if it brings up a menu that shows the minix and then enable it.
Last but not least, you could try a factory reset as detailed by
@Villa
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Villa
Administrator
May 5, 2020
#1
The Recovery Button is located on the left hand side of the device behind the antenna.
You will need a bent out paper clip or similar to depress the Recovery Button.
Paper Clip: It was invented in 1899. It hasn’t been improved upon since.
https://www.tenfactsabout.co.uk/0037paperclip.htm
With the device powered Off.
Keep pressed the Recovery Button then press and release the Power Button.
MINIX Splash Screen is displayed.
~10 seconds the screen becomes black for ~2 seconds.
MINIX Splash Screen reappears.
The Recovery Button can be released.
~10 seconds the Recovery Menu appears.
Scroll down to factory reset. Click OK on your remote. And then accept.
Wait until finished and reboot your minix.
Failing that, you may want to contact support@minix for advice.