ANTMINER S2 Discussion and Support Thread

[Biodom]

It has been running great for many days and now all of a sudden this!
How can it be fixed?

Thnks all

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.

[MoreBloodWine]

If not paste, why / how would swapping bays with another blade help ?

I've seen others report this xxx000 thing before.

[Biodom]

If not paste, why / how would swapping bays with another blade help ?

I've seen others report this xxx000 thing before.

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.

[navigator]

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.

[MoreBloodWine]

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.

That 100Gh loss is gonna suck for people with say like 10 of these and 4 blades removed with 4 weirded out machines. Although, if you got 10 of these and 4 are having issues then I'd start looking at Bitmain.

[philipma1957]

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.

That 100Gh loss is gonna suck for people with say like 10 of these and 4 blades removed with 4 weirded out machines. Although, if you got 10 of these and 4 are having issues then I'd start looking at Bitmain.

frankly I never purchased one ,but based on hundreds of posts I would say run 9 blades.  In the long run it may be better.

1) less  hardware  errors
2) it will run longer without dying
3)  you could sell a  blade as a repalcement on ebay
4)  you kind of need cheap power or better  btc usd price to make out.------------if you get this having the machine run trouble free on 9 blades for 5 months vs crashing and burning on 10 blades after 3 months  may be the better choice.   

[MoreBloodWine]

But the fact still remains, AFAIK, not having a clear cause for the problem. Plenty of speculation, most starting with the PSU.

[tazdas]

Lo all fellow bitmainers.
Need a couple S2 coupons pls.
Will tip! Name is the same as here.

Thnks all

I need one coupon as well.. my only S2 is having issues booting up, most likely its the beagle board as I cant get it to boot ..no blue light or any light on the network port .. tried couple of SD cards and flashed them .. still no luck

[digitizing]

beware if your country ask high tax for import.
because bitmain now declare the price as much as you pay.
they wont under vaule the price for custom purpose even if you ask.

[freebit13]

Believe it or not, I have fixed this by simply ejecting the SD card while the machine is running, switching the machine off, re-inserting the same card and starting up again and it worked. It doesn't always require a re-imaging of the card and is worth a try first as it's quicker 

i had see someone to tell to put in and put out the sd card
untill the board start again boot
but i do not remebe very well the steps any details
please

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.

[freebit13]

If not paste, why / how would swapping bays with another blade help ?

I've seen others report this xxx000 thing before.

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.

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

[freebit13]

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!

Bitmain will replace your PSU, just ask them for a shipping label and send it back and they will send a replacement. Lucky you had a replacement PSU to keep you hashing in the meantime.

[MoreBloodWine]

If not paste, why / how would swapping bays with another blade help ?

I've seen others report this xxx000 thing before.

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.

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

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.

[freebit13]

If not paste, why / how would swapping bays with another blade help ?

I've seen others report this xxx000 thing before.

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.

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

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.

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

[MoreBloodWine]

If not paste, why / how would swapping bays with another blade help ?

I've seen others report this xxx000 thing before.

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.

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

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.

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

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.

[freebit13]

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.

Kano, works on the cgminer team. He made the S1 update and is working on an update for the S2 also. Looks like he has a working version for some, but it doesn't seem to work on Eligius.

Here's the CGMiner thread, it's in there somewhere, don't remember which page:
https://bitcointalk.org/index.php?topic=28402.15260

Edit: here's his github page for the S2: https://github.com/kanoi/cgminer-binaries/tree/master/AntS2

[PhilippeD]

Hello,

I have overclock one of my two S2 (212Mhz instead 196Mhz) and change PSU (new PSU = corsair 1200)

You can see the result below

Blue line = Overclocked S2

Green line = Normal S2

[PhilippeD]

It has been running great for many days and now all of a sudden this!
How can it be fixed?

Thnks all

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.

Same problem as you.

My (stupid) solution, but solve the problem for me :
Don't use DHCP but static IP.
Remove the LAN wire.
Power on the antMiner S2. (so S2 will not hash).
Wait 2 min.
Plug the LAN wire.
The antMiner S2 will start hashing.
No 'xxxxooxx xxoooo...." will be reported on the web interface.
I don't understand why but some boards need time to start ...

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

[PhilippeD]

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

[TracerX]

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

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