Bitcoin Forum

Hi,
Yesterday my S7 was working normally (4.750 Th/s). Connection to Internet was interrupted and I shut down the miner for several hours. Now (when I turned on it again) is working only 3.200 Th/s. Why?... What to do?
Thanks

Give us a screenshot of your status page. One board is probably not running. Whether is dead or not is up to see.

Yeah 1 board is down.

I would reset my freq from 700 to 675 set my fans to 50% boot.

Wait a bit  and then see if I was at hash of 4600 fan speed of 3600-3800 rpm check error rate under .0050 lastly check my temps under 63

Thanks Philipma 1957 and Virosa. I turned off and tuned on the miner and now all is ok.
Thanks again.

Looks like I am now having the same problem with my miner.

How much time should you wait with lower freq?

And other things that can be done if this does not correct the issue?

Thanks

Its just to see if its the PSU being an issue. If you reboot with low freq after a power cycle and it still does not work, then barring something obvious missed, a board is probably having some issues.

Yes psu if running at full speed slowly kills itself or ages itself.

So if turned off and back on it may never reach the speed it did.

A lower freq will allow all boards to fire up

It that works. Say 700 down to 650 wait turn off after an hour . Then try 675.

Ok thanks guys

I will keep messing with it.

Expect more questions to come about it.

I just posted in another thread a different issue now.

Does not seem to want to stay connected to the net. It will connect to hash for about 15 seconds then stop.

Is the fan running?

Does the fan show up in the gui?

Is the cable good?

Fan 1 and 3 are on. It does show up in the gui

http://imgur.com/dFcSs5x


This is what my miner currently looks like

I have freq at 650

Fans at 30%

try shutting gear down .

only plug in the controller and one board

if it runs shut down

unplug the one board, then try board two.

if it runs shut down

unplug the one board then try board three.



is all boards work one at a time the psu is too weak.


if there is one dead board.

switch the white wire attached to one of the good boards 

to the dead board.

this way you know that the 'dead' board is using a good cable.

 

Ok I will try all that.

Thanks for the help.

I will post in the morning what happens

http://imgur.com/NxEvuvO

Good morning

Here is a pic of the results of the board now in question.

I did each board on its own.

When this came up, I did switch the controller cables around and it came up with the same result.

So when looking at the machine from top down. Eth plugin facing me. This is the board on the left hand side.

Also I have the fans set to 30 percent still. What I also did notice is that when going through each board the fan speed lowered for the other
two boards but not the board in question when I had it plug in on its on. Hope that makes sense

I now have everything plug back in. The fan speed is back lowered again.

I am trying to explain everything best I can.

So it looks like the asic are fine but does not want to hash. The other two boards hashed on their own when plug in on their own

so here is the screen shot of the 'dead board'

it has 48 asics.  and no temp reading

what batch is your gear?

it looks like you should be batch 8 or higher  see the other photo

I see a board with 48 chips no temp
https://i.imgur.com/tjARoG6.png

I see
 a board with 45 chips
 a board with 45 chips
a board with  30 chips no temp
https://i.imgur.com/kbNfyKX.jpg

I am pretty sure it is a batch 8.

I bought it new used. I did not purchase it directly from Bitmain

It was shipped in december of 2015

okay seems like the board get detected wrong. 

batch 8 to 16 should be 135 chips.

45 + 45 + 45

so that board read 48 chips and or 30 chips.


 so all cables to and from controller seem good.

the psu seems good.

so the controller  has 3 slots 

  a    board 1   good
  b    board 2   good

  c    board 3     bad


can  you try to get the cable of the bad board to reach either slot in the controller that is working.

if you can manage that and the bad board stays bad  it is a board issue.

if the bad board reads on the the working controller connector  slot it is a controller connector issue.

you could run 2 boards and order a controller  connector

https://www.bitmaintech.com/productDetail.htm?pid=000201601120933252220cfbfFq20693

http://imgur.com/bxDzhiB


Switch the left cable with the middle and vice versa

here is the pic

one last test  ( really looks like a dead blade)

lower freq to 500

keep the dead one in the middle plugged into the middle

unplug a good one


fire it up

I think  you will get the good one to read good and the dead one will still be dead

if so do not mine with it  mine with the two good ones at freq 650 .  Keep the dead one not attached.

I  will look for a link to repair the dead board.

here is the repair a dead board thread:

I am trying  every test for you to do before you take a solder iron to it.

If you still have a bad board afer those test above. refer here and ask the op what he thinks
https://bitcointalk.org/index.php?topic=1420909.0

http://imgur.com/9xItq1T


Ok so I still have the cables switched around

I fired it up with freq set to 500 without unplugging a good board yet.

This time i also got a temp reading on the bad board.

Just wanted to post this info before I actually unplug one. Does this mean anything different now?

I am not uber tech savvy and this has my head spinning. LOL

Thanks for all the help so far.

Weird as this sounds, trouble shooting stuff can be fun. I am learning so new things here

Ok since that last pic after I got a temp reading.

I bumped the freq to 550.  No temp reading registered. I then put it back to 500 freq.  No temp reading now on that

I just unplug a good card with the bad card plugged in at freq 500

asic 30 freq 500 no temp reading

bummer

maybe ,  but still reading  wrong amount of chips. 

pull a good board  get back  with numbers with  that low freq. setting.


there is a smaller chance this is a psu issue and not a board issue.

once you give me the two board 500 freq result

 I can do one more test.  to fully decide the board or the psu.

It is not the controller   the tests pretty much eliminated that.

This morning now I cannot even get the red light near the eth plug to turn off

I will send a pic of any results once I get that sorted out now. Not sure why this happened

Machine was not running all night

Msg back in abit

well some good news Bitmain warranty is posting after being gone 100 days.



https://bitcointalk.org/index.php?topic=1430885.msg14645057#msg14645057



maybe he can help your issue.

http://imgur.com/eWIEZyi


Hello

Ok here is a pic of one good board plugged into controller board and the bad board in question plugged into the controller board

Set at freq 500    fan speed 30%

looks be be a bad board    mine with two for now  with a slight under clock.

say 675  to make life easy on the good boards.  Set fan at 30 or 35%


and look to see if you can find a good board or check that repair link.


here is a repair link  https://bitcointalk.org/index.php?topic=1420909.0



@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

and here is the bitmaintech warranty  person


https://bitcointalk.org/index.php?topic=1430885.msg14645057#msg14645057


I have had no help for my underhashing batch 1 s-7 while it was in warranty  from nov 2015 to now

you are out of warranty so i have no idea if he will help.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@


based on all the testing you did it really looks to be this  thread is your next stop


https://bitcointalk.org/index.php?topic=1420909.0

Will do

Thanks for all the help.  Any idea on a rough cost of a new board? Weird how a board can go just like that.


I have looked into the repair link. Almost seems like open heart surgery on the miner :'(

Yes I will be out of warranty now as well. I swear they build this stuff to break after 91 to 120 days

Any luck?

If the hash speed is still not up to the full speed, your unit or hash PCB or control PCB needs some repair work done to get it back to full speed.