I recently purchased the LG 49SJ800V. I would like to wall mount this TV using a full motion TV bracket (like this). Aerial and electricity sockets are located at 1.83m from the floor on a plasterboard. The first thing I did was to search for the stud using the Bosch Truvo. Yet I could not find any. I then opened the socket to check whether I could spot the stud from there. But, I could only see a quite thick plasterboard (see pic) and a gap between a wall made of bricks and the plasterboard. The socket were screwed over an horizontal piece of wood possibly attached to the brick wall.
Given that TV weights about 13kg (about 29 pounds) and that the plasterboard is quite thick, I was hoping that 6 spring toggles would do the work. However, after some search on the internet, it seems that a number of people advises not to wall mount a TV with a full motion bracket without fixing the bracket to the stud.
Any advise on this regard?