Super late reply as I just came across this post, but since I just ran into the same thing, figured I’d reply anyway-- in my case, I fried the seed by hooking up the + side of my pots to 9v rather than the 3.3v provided by the seed, which caused the ADCs to see a voltage above their maximum. Of course not positive that is the same thing that happened to you, but I had a similar setup with 9V power supply and a series of pots connected to the ADCs and the failure symptom was similar (LED came on for a few seconds, started smoking and now no longer turns on…). There are ways to protect the ADCs (Protect ADC from overvoltage - #4 by bikerboyroy) which is probably best practice, but it’s just a matter of making sure those ADCs never see a voltage above what the datasheet specifies as the maximum.
Chalking it up to learning the hard way 