One of the questions I get asked regularly is how to fix heavy items such as a TV to plasterboard or drywall. Unfortunately there are no plasterboard fixings available that I would trust to hold up a 65 inch TV that has cost hundreds of pounds, as even the best plasterboard fixings cannot support enough weight for them to be effective for this job as they all rely on the strength of the plasterboard itself. By locating the studs and fixing to them you are guaranteed to get the best fixing available and guarantee that your expensive TV will not end up on the floor in several pieces.
I tested out some plasterboard fixings in a previous video, the results of which are interesting-
https://www.youtube.com/watch?v=ECDysfNhx_E

The magnets are available here- http://fave.co/2s3obkh