The problem is most likely a disconnected or damaged temperature sensor, I had this problem when reassembling a 2007 Mac mini. It can't read the temperature, so assumes the worst and sets the fan to maximum.
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Did you ever find out or do the repair? I’m hoping to do a similar procedure: using a 2015 logic board to repair the 2017 macbook.
The problem is most likely a disconnected or damaged temperature sensor, I had this problem when reassembling a 2007 Mac mini. It can't read the temperature, so assumes the worst and sets the fan to maximum.