Powered USB hub fried my MacBook Pro?

It wouldn't hurt to try resetting the SMC again a few times:

Reset the System Management Controller (SMC) on your Mac - Apple Support

Read the instructions carefully to be sure you are doing it correctly. Sometimes it takes more than one try.

Good luck!

Do you have access to an Apple Store? If so, you can get your Mac evaluated at the Genius Bar for free.

Be aware that there are a number of components such as the I/O board or Mag-safe board that could be the problem. It doesn't have to be the logic board. These smaller boards can be replaced and are a lot less expensive than a logic board. But you will need to get it evaluated at some point to diagnose the problem.

Not sure what you mean by USB kill pendrive, but if the hub affected anything, the first place to look would be where it was plugged in. You might want to visit ifixit and look up your Mac and have a look at the various repair guides and get a better idea of what it is like inside:

https://www.ifixit.com/Device/MacBook_Pro

There wouldn't be any point in actually replacing anything until you have a definitive diagnosis, but since you know where you plugged the hub in, you can see the part most likely to be affected. That might be helpful information.

Good luck!

You would probably have to pay a fee at the AASP to have the Mac diagnosed, and given the time and expense of traveling a long distance to the Apple Store, the AASP might be the more practical option. There is no substitute for an experienced Apple authorized repairman looking at the Mac and determining exactly what the problem is. It could turn out to be something simple that is relatively cheap and easy to fix, or it could be much more serious.

In theory, USB ports are supposed to shut down to prevent further damage if there is a voltage problem, but I don't know what the mechanism is or if that process led to the Mac not working. It's really impossible to say. Your best bet is to take it in along with the hub and see if they can figure out what happened and what it might take to fix it. There's really no way to diagnose it on a forum like this one. Resetting the SMC is the usual cure for power problems and you've already done that numerous times.

Good luck!

It just occurred to me that there might be another scenario that could explain all this. Possibly your power adaptor has failed and is no longer charging properly. In that case, the battery would drain and become exhausted and the Mac would shut down. With a dead charger and a dead battery, the Mac would be dead too, and all the resets in the world wouldn't get it going.

It's easy enough to test this hypothesis--just try a known good charger. Possibly a friend has one, but the AASP would have one for sure. If the charger turns out to be the problem, then in all likelihood your Mac is fine and all you'll need to do is to buy a new power adaptor.

If you end up needing to do this, be sure you get a genuine Apple charger from an AASP or other trusted source. Be aware that there are many cheap counterfeit ones on Amazon and elsewhere.

Good luck!

This is not sounding good. If the AASP says the logic board needs to be replaced, and if they are competent to determine this, then that might well be the reality. This all seems to have happened when you connected the hub. I've never heard of a powered hub doing this, but I suppose anything is possible. If a logic board can be destroyed by a USB killer, then it's possible it could be destroyed by a different USB device. Super cheap devices are often counterfeit with unknown capabilities.

Modern logic boards need to be repaired by a BGA (Ball Grid Array) specialist, and you would not really be able to tell the difference between a repaired one and a new one. Generally after a reball the board is as good as new provided that none of the chips on it were compromised to begin with. It's also possible that you are being offered a used logic board, which might well be half the price of a new one. If you want to consider this option, try and find out a little more about it and especially if it has a money back guarantee.

Hard to say what to do at this point. First thing might be to ascertain from the AASP if everything else is OK or if there could also be damage to any of the other internal components. The logic board is definitely the most expensive component, but it's possible there may be others.

Has anybody had a good look at the hub? The AASP or even the unauthorized guy might be able to measure to see if it did in fact deliver a jolt of voltage to your Mac. If it looks like it could have, that would at least be a confirmation that the hub was the culprit.

There is a source of parts and instructions in the US called ifixit. I don't know if they ship to Brasil, but if they do, that might be a possible source for a logic board:

https://www.ifixit.com/Device/MacBook_Pro_15%22_Retina_Display_Mid_2014

Not cheap here either, but still a good source of information.

Really sorry not to be able to help more. This is one of those cases where the Mac needs to be evaluated in person. I don't know if it would be worth the trip to the Apple Store to get another opinion, but that might be worth the effort before actually doing anything. In the end you will just have to think it over and decide what you want to do.

Good luck!

From your description, it could have been any of a number of things. It would make sense to have it evaluated at an Apple Authorized Service Provider. https://locate.apple.com