if some one know some specs or datasheet.Maybe some one has circuit diagram or parts of it?
I don't have much knowledge about repairing hashboard but I have experienced repairing cellphone and gadgets. This is not easy to fix if we don't have a circuit diagram or replacing parts from dead hashboard is the best way to repair it.
I can't find any circuit diagram but this one might help.
Check this
[INFO]BITMAIN Antminer S9 parts list(BOM).