I've been experiencing a similar clicking noise with a Samsung NU8000, and just wanted to share my experience in case it helps out someone (please like this post if it solves your issue, to help others find it). It may sound silly, but when I first bought my TV I didn't remove the sticky plastic film/strip from around the TV's frame. The clicking noises were always heard a short time after turning the TV on, and also after turning it off. A couple months later, I removed the plastic sticker/strip from around the TV frame, and since then I haven't heard any clicking noises. I'm guessing the eletrical static did something to the plastic stirp which made the noises. I might be the only one who doesn't immediately remove the plastic around the frame when buying a new device, but just in case I'm not, and this does help out someone - I'm glad I could help.
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