Same issue here in Australia with a Samsung NU7100 65 inch set. Not as loud as some are reporting, but a clearly audible tick every few seconds, about the volume of a dripping tap. Looking at the back of the tv, it's coming from the top right hand side, near to the edges. Same spot every time. It comes and goes, somtimes it's randomly spaced, but right now it's metronomic. I'll contact Samsung locally and see what they have to say.
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