will not charge, LED does not illuminate and have replaced I/O board

Hi all, hoping to get some solid advice here... Ok so I have gone through trying SMC reset, different power supply (which all work on another MBA), changed I/O board... and still this little gem doesn't want to do anything for me.

I did not spill anything on it, it simply just started having trouble charging when connecting power supply and then one day it stopped and hasn't come back since.