Quote from: methodlimp on July 08, 2016, 06:48:36 PM

Hi all,

Here's my backstory: My Antminer S7 batch 7 units had 6 out of 9 boards burnt out within 2 months (back in January/Feburary). Since they were still covered under warranty, I sent them to Bitmain China to repair under the warranty, and spent about $200 shipping the boards for the RMA. It took one month to get the boards back from China after they were "repaired."

Within 30 days, the exact same boards I got back from china under the warranty burnt out again (I've got Batch 8 miners that have been absolutely great since day 1 with no issues). When I pulled out the boards from the miners, every single one of the boards I got back from China under warranty has heat sinks fall completely off.

Rather than go through that trouble again, I decided to send them to Bitmain USA and pay a fee based repair. (bitmainwarranty.com)

They were delivered on June 4th. One month and 4 days later, I still have no idea what's going on with my boards. The last time I heard from them was on June 30th when they said the advanced tech needed to take a look at them. They said the boards couldn't be repaired via normal repair process and needed a "deep repair."

First off, why were my RMA boards dead from bitmain china within a month after I got them back?

Secondly, why are those same boards unrepairable for Bitmain USA, and why is it so painful to get any response? I never overclocked them and ran them in a server room... my RMA'd boards should have never died again within 30 days.

5 of the 6 boards I sent had no burn marks and falling heatsinks. One of the 7 had a slight burn mark under one of the heatsinks. And yet all of them are "unrepairable" and need a "deep repair?"

Has anyone had luck with BitmainWarranty (US fee-based repair)?

The last time they posted on the forum was back in June 13th, so that doesn't make me feel any better.

They have very good service you can contact them through website - https://bitmainwarranty.com/contact/ , or there is even a phone number you can call on site. They are very quick on customer service. To my knowledge they can do all repairs that standard China route does, but on a much quicker time frame for those in or close to US.

What way's have you tried to contact BitmainWarranty? They should be able to give you a much better anwser then us guessing but from my dealings with them they are very quick when I dealt with them. So I again suggest contacting them.

Questions of OP:
1. First off, why were my RMA boards dead from bitmain china within a month after I got them back?

We cannot give a good reason but I would look at your mining area as burning 6 out of 9 on initial is not normal. And if you got them back and still are burning them again something is wrong.... I would look at your mining area (PSU's, Electricity, Heat, Etc). It could be something on your side is common factor though going through so many boards. This is something you should ask BitmainWarranty if you sent them the boards as they can tell much more then our guesses on forum.

2. Secondly, why are those same boards unrepairable for Bitmain USA, and why is it so painful to get any response? I never overclocked them and ran them in a server room... my RMA'd boards should have never died again within 30 days.

Look above and contact them though website or phone even. They are very quick every time I have dealt with them. But if they say it's un-repairable for them it would be un-repairable for standard China route to. They have full capability when doing repairs. But again best advice is to contact them as they know more then anyone on the forum of your situation.