Interested on your thoughts on why it appears that three boards burnt simultaneously and separately? Didn't stop mining during overheat, controller issue, OC'ing or your PSU giving a funky '12V'?
Honestly I have no idea. The only thing that occurs to me is that it would have to be controller related somehow, otherwise the overheat protection should have kicked it off. Same goes for a fan failure, loose heatsink, etc. If it was a power regulator or something board-level, it should have been isolated to one board. But all 3 boards burned from the inside out, due to what appeared to be shorting. Something happened in which the over-heat protection did not do its job. If it was interruption in internet, I would have seen it with the other miners (or at the very least seen a disruption in hashrate at the pool).
As for 12VDC input voltage, I was using 2x DPS-2000BB (DPS4K setup) together that was powering the failed miner, another B1 S7 as well as an S5 at the time. None of the others suffered from any kind of failure, and are still hashing to this day.
I understand hardware failures happen, it's life. I'm just frustrated about their poor communication, late shipping of the miner, trying to claim it was outside of warranty because they falsely marked the order as shipped ~10 days before a label was even created (and in this case it would have made the difference), that they mishandled and lost my package for a month or more (and I had to continuously email them to look for it, that they are denying warranty on a machine that clearly suffered catastrophic failure not related to normal usage and that they feel that offering a $20 (or 1%) discount somehow rectifies the fact that I lost over $1500 on a machine that failed inside the warranty period (in no specific order).
the guarantee not cover board? so which the part of guarantee ?
That's what I would like to know as well.
It is a bit disturbing how it failed in a "burn down the house" sort of way, but hardware is going to fail. All of it. No matter how well made too, it will eventually fail. The real warning here I think is the inability to provide the warranty and the cavalier manner in which they treated the whole warranty claim. That's my 2 bits anyway.
EDIT: I understand also the idea that they don't want to warranty burnt boards because they can't be sure just what people are doing in terms of what PSU's they use, how many connectors, and so on. But in this case I think there is a strong enough case for the failure being the miner and not the PSU or the end user.
Agreed. I mean, even if they would have shipped me an S7 7 months after mine failed, and I still had not a snowball's chance in hell of a ROI, at least it would have been an act of good faith. In this case they are completely copping out and it's infuriating, especially after wasting so much of my time. This clearly shows VERY poor ethics on their part.
Realistically, IMO they should send me out an S9, I would even pay a difference of ~$500 or slightly more to offset the fact that I did earn some mining revenue from the S7, but I still wouldn't be as far ahead as if that S7 would have been hashing the entire time. To make matters worse, I was solo-mining at the time and didn't want to give up, so it could have made the difference between solving another block between then and the halving, although that's getting pretty far into suppositions.