Topic: ANTMINER S2 Discussion and Support Thread - page 29. (Read 355820 times)

Bitmain needs to deliver a decent upgrade package for his loyal S2 customers - who will not see anything like an ROI - which the S1 and S3 will...

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which the S1 (did) and S3 (most likely) will...

AntMiner S3 for sales shipping starts from July 10th

Speed:    478 GH/s

Price:      0.75 BTC

Link : https://www.bitmaintech.com/productDetail.htm?pid=00020140630025130637RV8OhOwt06BC

http://img4.hostingpics.net/pics/538409003201406301025098334V0o3dRR0656.jpg

So, my S2 I got recently hasn't been running smoothly. After some testing and experimenting it now runs stable with 9 blades. With 10 blades I could get it to run about 12hrs at 1th before it started dropping hashrate. If I then restarted the miner process some blades would show up as bad or with x's and I would only be getting 700gh+. With 9 blades, it's running smoothly at 900gh/s for 24hrs+. The one card I removed has only a faulty temp sensor. Does anyone know where it's located on the blade? Or is it inside the chips?

I think the PSU is the problem but don't know 100% yet.

What frequency are you running?  I facepalmed myself just now for not thinking of this!

After having no setup issues and running great for the last couple of weeks, I woke up this morning to find my batch 1 AntMiner S2 not hashing, fans going full speed, panel dim and the red light solid. Recalling that others here have had the same issue, I went back and skimmed over the previous posts and found that the likely issue was probably a corrupt SD card. That was indeed the case, as I am now back up and running, and I figure the problem started when a brief power outage occurred here this morning. Thought I would briefly summarize what I did to recover, which may be of special interest to those folks using a Mac to write to their SD cards:

- ran to the store and bought a 4gb Sandisk microSD card. They didn't have any class 10 cards, only class 4, but it seems to work (ordered a couple class 10s from Amazon for backup).
- Downloaded onto my MacBook the latest firmware from the bitmaintech website, as well as the SD card image from https://dl.dropboxusercontent.com/u/16075357/bitmain.img.zip (thanks 1l1l11ll1l)
- put the new microSD card in the adapter, shoved it into my MacBook, read through the guide at http://elinux.org/RPi_Easy_SD_Card_Setup, and then ran these commands in Terminal:
   cd Desktop (my bitmain.img was on the desktop)
   diskutil list (to find the disk name of SD card, mine was disk2, so replace disk2 below with what yours is)
   diskutil unmountDisk /dev/disk2
   sudo dd bs=1m if=bitmain.img of=/dev/disk2 (this took 30 minutes to complete)
- once SD card was ready, I opened up the AntMiner, pulled out the BeagleBone card, swapped SD cards and reassembled
- powered up, and it started hashing again. Connected to the miner from the browser, uploaded the latest firmware, changed to point to my pool, and everything was golden.

Much thanks to all of previous posters that talked about this issue, as your help got me back up in hours as opposed to days.

Other solution :
Remove the bad board
Overclock the S2
Run the Overclocked S2 with only 9 boards
I will have the same hashing speed as 10 boards

Take this board out and examine it visually. Could be an excess of grey thermal paste at the bottom-remove using Q-tip 'technology".
If not, exchange the position with another board while making sure it is pushed into the slot all the way.

Kano ?

Also, still looking for some S2 coupons if anyone still has some valid ones. Looking for 4 of them, my Bitmain name is the same as my name here... MoreBloodWine

Ty.

You would think so, but it seems to have been left to Kano to sort out in the meantime...

That being the case, you think Bitmain would have caught on and tried to find a resolution instead of pushing miner after miner out the door.

My guess is that it's software related, the system doesn't seem very stable.

We have received an S2 Antminer yesterday.
The 1000W Enermax PSU of Antminer was not working at all from the start!
So we have no way just to replace it.
We have replaced it with an EVGA G2 1000W 80 Plus Gold PSU and now the unit running!

Here is the pics:

http://forgeco.in/images/powerreplace1.jpg
http://forgeco.in/images/powerreplace2.jpg

I hope that Bitmain cover our costs and the headaches to find the problem!

I don't know exactly why, but it does-I had exactly the same problem and this is what fixed it.
Boards are not exactly the same size, so, I guess, they fit better in different places on the control board.