Yeah I also got a repacement for my 55 Q8F, and within seconds of turning it on for the first time it started ticking again. I moved it to a different plug as I read it might be an issue with the electricity, and so far it definitely seems much less frequent while on, but just as frequent when turned off which is odd. I literally just opened it for the first time maybe half an hour ago, so it is definitely liable to change but I'll probably keep experimenting with different plugs and things. As I write this comment I've had the TV on in the background (mostly on mute) and I haven't heard the tick once, but as I say when I turn it off it starts going again. I'm going to turn it off for a bit and let it cool right down, then turn it on again and see if it starts doing it while on again.
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