If you have an articulating/full motion tv wall mount bracket picture like below, it will be easier to remove since you have visibility of the back of the tv.
How To Remove Tv From Sanus Full Motion Wall Mount. Want to learn how to dismount a tv or remove a tv from a wall mount? You have to take out the rod while the tv is flat against the wall mount.
SANUS Single Stud Full-Motion TV Wall Mount for 32" to 80" TVs from shop.sanus.com
If you have vision or mobility problems, this is a nice way to get just the right viewing angle to accommodate. Aeon stands and mounts full motion wall mount with long 29 in. Offering an extension up to a length of 9.5 (24.1 cm), the mount allows easy viewing from anywhere in a room.
It looks just like you have not even used a wall mount, almost invisible!
Easily mounted in the home or office, it offers smooth extend, swivel and pan motions up to 7.2 from the wall. If you have vision or mobility problems, this is a nice way to get just the right viewing angle to accommodate. The first thing you need to do to remove your tv from its wall mount is to unplug everything. Wall mounts consist of two parts attached together and sometimes secured by a lock.