Whoops, did you not use the right length screws.
The mounting bracket screws will short onto some electronics if you fit screws that are too long and from your superb description, it sounds like you did everything right but do not mention what screws you used.
Smoke coming from a TV is always a sign that something has burned out and unfortunately it is never a fuse. The TV will need fixing, there is no chance of it still working after it has smoked.
If you are lucky, it will just require a power board but you need a TV engineer to look at it as it is not something that you can usually do yourself. Even if you bought a new power board and installed it, there is no guarantee that the main board/processor board or inverter has not blown as well and this is why I recommend a professional looks at it.
Unless your house insurance covers the damage (if the excess is not too high).
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Sound like something metalic got into the back of the set and shorted something out. The click sound is from relays on the power supply board which turn on/off power.
You can rotate the set and listen if anything rattle. Maybe a screw fell inside.
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