Broken Quest 3S Cameras

If a full and complete factory reset did not resolve it, and as you said, you have all those issues still, then yes, this sounds much more like a hardware/tracking subsystem failure than a software issue.

Unfortunately the forums cannot process RMAs directly, so you’ll need to open a support ticket through Meta Support with the serial number and the troubleshooting steps you already performed.

I would also avoid posting the full serial number publicly on the forum.

Here's the link!

https://developers.meta.com/horizon/support/

This is happening to me too but I figured out if you tap the front of your meta headset for a couple of seconds it will start to work but if you put you headset to sleep or restart it, it will go back to the black screen. Also sometimes if you tap the headset it will not 100% work all the time.