If everything is working correctly, sure it would have power. But there's probably at least 1 fuse involved. And if your power converter is not working, your coach battery will run down and may not have enough power to operate the tablet.
Start at the main fuse box and check for a blown fuse. You'll need to do a manual inspection of the fuses, ideally with an ohm meter.
It's possible the device gets power from the levelup system. You should check to see if the outside or basement controls are working.