The clicking noise is a protection circuit that prevents the TV from switching on when a fault is detected.
That means that there is a short, a bad solder joint, or a bad component inside the TV, usually any good technician is able to find out at least the nature of the fault. Often this jobs must be done at a repair shop, as testing may take time, probably your technician was just in a hurry.
All you can try at home is leaving tv unplugged for a couple of hours, this drains power from the set , and fix some problem.
If it does not work send it to a repair shop.
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