location?

If you want to come down on price of the D3's, let me know. Im interested but not for prices that will never ROI

Location?

@blockware - I live near Chicago, if you really value your "business", invite me out to your facility so I can see your operation. It is fairly common for new large vendors to invite clients to provide confidence in their business.

I have messaged blockware via craigslist in the past, and get the same copy/paste scam reply as with "vantage" and other craigslist scammers that offer unrealistic prices.

I have two Antminer S9 for sale, both work great with no issues since I got them in December/January. Located near Detroit MI. Will ship at buyers expense. Escrow accepted and preferred. Will take pictures and videos before packing up to ship.

https://imgur.com/RnQ0pSS



SOLD

I think you are severely underestimating how difficult it is to find a block. Its not going to happen today, tomorrow, next week, 6 months from now, etc. It literally is the equivalent of buying a lottery ticket and waiting for it to pay your mortgage off. Unless you have an absurd amount of hashing power (talking like hundreds of antminers, not your 5 14TH/s), you won't be making that ROI, you are going to run yourself poor in electric cost before you ever smell a block.

everyone here is trying to help steer you in the safe, reliable way to get your ROI and not go broke wishing on a star, join a pool like slush or kano (or nicehash if you are lazy), and let it ride.

My miners are in my garage, we had crazy arctic weather the last couple weeks and the machines loved it. ran without a single hiccup and chips stayed in the 50-60* range. The garage is sealed of course, but I leave the side door open about 1/8th of the way to give a very gradual balance of fresh air. They are about 15 feet from the door so they are safe from the elements

just run them!

scammers get mad when they get called out...

You havent answered the very simple question at all, ESCROW or NO?

Where are you shipping from?

Purchased an Antminer S7 for my father to get him into crypto over christmas break, and one board failed to work on the unit. Tried several fixes and ended up sending to bitmain warranty who told me I had a dead board.

Looking for 1 S7 board V1.31. PM me and let me know what you have.

Sent PM!

Unplug all boards and test them one by one. if they all work individually, try two at a time in all the combinations. We can go from there, but there is no point in trying to diagnose it before testing all the boards.

Take a look here for my reasoning, very similar issue: https://bitcointalk.org/index.php?topic=2599853.0

Ended up I had a board that was a couple versions older and it was causing any boards plugged in with it to not hash as well.

What is your location? I will meet to buy it but never without escrow if its being shipped.

Were all 3 boards showing the red LED on when it was having problems? If you want to rule out the IP issue, which I doubt it is, you can assign the antminer a static IP address.

Did you have a back-up pool assigned or only one pool? I wouldn't know what happens if the only pool on the list goes down, but if you dont have a backup, i would suggest a safe fall-back like slushpool or viabtc just in case.

This forum is in serious need of moderation. the rules are completely disregarded and too many new or gullible people are losing their coin and cash from it. the rule is a picture with the machine and username, yet 95% of the posts fail to have that even when they say they have the units on hand. its insane.

Wait, yours is running at 100 what? 100*C? turn it off before you destroy it. You should be concerned and finding a solution at 80*C to reduce it, I would be surprised if it lives much longer if you are really that hot.

From my experience trying to get spare parts, you wont be able to piece an S7 together for less than what they are going for right now (1200-1500). Each board in working condition is selling for ~$550-600, controller board for ~$100-200, I/O ribbon cables for $15x3, then fans (not sure on price). Better off finding a solid working unit.


Another possibility is finding the "broken" boards that actually just have bad PIC's and soldering on the potentiometer that is in a fix thread on these forums. They usually sell for under $100 on ebay.

I would suggest starting with an older model if you can find one. It wont come with the enormous S9 tax and you will still learn a huge amount about mining, noise, heat, setup, pools, etc before you go out and drop the big $ on an S9 or whatever new comes out in the future. I picked up two S7's and my god have I learned more than I ever wanted to about them. The first day I got my first unit, I plugged it into the wall in my spare bedroom, the fans came on after flipping it on and i was like wow everyone exaggerated the noise... then it actually booted fully and the fans kicked on to full speed... its now out in the garage with the others as I learned that lesson in about 2.3 seconds! Read up on the common issues, fixes, maintenance costs, etc. I have spent countless hours on some of the most trivial fixes, and also had to take out my soldering iron for some not so trivial things.

Is there an archive for previous firmware versions? Bitmain only shows the two from May of 2016 so I'm unsure of where to find legit versions... And the stigma against firmware updates to antminers in general!

Related, does the backup function in the settings also back up the firmware on the machine or just user settings? I did create a backup before I flashed firmware trying to get it running, wondering if that could work.

I measured voltage across the inductor hoping that was the issue (like here: https://bitcointalk.org/index.php?topic=1420909.0). However I believe 8V is ok when testing on a bench? I basically just plugged in the boards 3 PCIe 12v connections and measured, didn't power on the machine. Tested at the PCIe plug and across the inductor to ground (see below):
https://i.imgur.com/Mpa0L7n.jpg
https://i.imgur.com/kuRbjnO.jpg

Is this voltage OK in testing or does it need to be 9.3V like the potentiometer fix says the board needs to power on? Again, all boards show "o" on the status page but refuses to hash and brings the other boards down with it.

Lightfoot, I cannot PM more than twice a day apparently... hope you are looking here too