On the Antminer, ensure the wire harness connections under the electrical cover are seated and tight as well as the bus bars.
On the Whatsminer, ensure the wire harness connections under the electrical cover and on the underside of the electrical cover are seated and tight.
If you find any wire harness connectors loose, tighten them back into place. If you find that the bus bars have shifted in transit, loosen all the screws on that bus bar and realign it properly so it is not touching the other bus bars and tighten it back down. Then put everything back together the opposite of the way you took it apart. Then set your ASIC aside for now, this is a good time to get your mining pool account setup and configured prior to starting up your ASIC.