I do really like bitmain, they are one of the better asic manufacturers out there. That being said, their return/rma process and procedure is awful and it's nearly impossible to get support. I had a unit that showed up with a capacitor that was broken off, when I went back to them for a replacement, they told me to press hard on the chips. I even had pictures showing the damaged component on the board with big red arrows pointing at it.  I finally gave up after a month of emailing back and forth. So, I would forget about trying to get anything fixed or returned to them. Junk it and buy another and chalk it up to the cost of mining.