Antminer D3 technical problem

[hossamelsawy]

I have a problem in my D3 miner just bought and i need someone to help me please
when I test each hash board separately and keep the PSU connectors and controller cable on one of the hash boards connected and disconnect the cables from the other two hash boards, it works very well but when I test all hash boards together it gives me (xxxxxxx) after about one hour
I downloaded the fire-ware from bitman website and upgraded but still gives me the same problem