I was able to access the back of the large tv by raising it about a third of the way, then slide the counter top up & off (no screws it just has long pins on each side), and reach my arm down from the top. I wasn't smart enough to go through the window.
The problem is that the tv mount blocks access to the ports. Sooo, if you flip down the sofa back there are two access panel held on by 4 screws each. Once you remove the panels there are two screws at the bottom of the tv that connect the tv mount to the lift mechanism. Once those are removed the tv will lift up and out of the cabinet. Once out you can access the four screws that connect the mount to the tv. Remove the mount and you can now access the ports. Again I never thought of the window. You may be able to access the four mount screws through the window without having to detach from mechanism.
Note that there is a power outlet inside the cabinet, so don't forget to connect your firestick while your in there.
Rich and Denise Valkos
US Army (Retired)
Good Sam Club