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All the TV's we have had in the past also have had a separate power cable, which is easy, just get a new one!! I am only assuming there is a loose connection inside as there has been traction applied to the cable, it's not quite long enough to pull the TV out to its fullest extent and I just think it's been pulled a bit too much over time.
I just wondered how difficult it is to get inside the TV and possibly replace the cable, or get a new one and instal it. It doesn't seem very easy to do, and yet it's really quite a minor issue. Seems that this is a cheap way to have a power cable installed, but to be fair it wasn't that expensive a TV in the first place.
I can easily get an extension cable to lengthen the wire to it doesn't get pulled on, but it's possibly the damage is done already