I think you will find that from a hardware point of view the IO Board is fine, the problem is that the version of firmware you are running does not support them.

Rich

I'm the one who took this screenshot and is responsible for the hosting of _kai_'s machine.

Just so you know, the cgminer output paste was from a different boot of this machine. During that boot, it appeared that cgminer wasn't starting automatically, and the stats screen just showed 0s on the top line (hashrate, elapsed, etc.) and blanks everywhere else (pool info, ASIC status, fan speed). Because of this, I decided to SSH in and start it from the command line to get more debugging information. At the same time, I unplugged two hashboards, in the hope that the remaining hashboard (the bottom one according to both the screenshot and the physical position in the rig) would work. I then saw all of this HW error stuff in the log output. Later on, I switched hashboards and got it to run again with only the top hashboard. I then plugged in all three hashboards again, and got the attached screenshot.

The PSU is a server-grade DPS1200FB running on 240V, and supplies an open-circuit voltage of 12.30 V, and at full load usually gives around 12.15 V. I have not yet seen a DPS1200FB shut down from overload on an S7, and the problem does not go away if I power only one hashboard at a time, so I am inclined to think that the PSU wimping out is an unlikely explanation. Individual chips burning out from mild overvoltage or transient spikes is more plausible, but I think still unlikely.

Intake air temperature was below 20°C at the time of the fault. The rig crashed at 1:25am local time. None of our cooling system was experiencing a failure at the time that the rig crashed. Both fans on the rig appear to be functional.

Has bitmaintech.com been non-accessible for anyone else?  If so, for how long?

Okay the freq is set to 612.
The error rates suck.

So bad psu
Or freq is set too high.
So try setting freq to 575 see what you get.

That board shows 54 chips.

My guess is you have an older batch 1-7 model

They do not clock higher then 637. And need a hot psu to do that.

So at 612 the psu may be lacking the testicles to provide the power you need.

Go with some lower clocks

575 even as low as 525 to see if the gear fires up

What's the current % of HW in the UI ?

The unit is trying to hash but you are getting Hardware Error.

You need to give us more information. It is still hashsing ? Not at all ? HW % ?

root@antMiner:/config# freq_value=0782
root@antMiner:/config# chip_value=200
root@antMiner:/config# chip_num=54
root@antMiner:/config# freq_m=$(($chip_value * 1000))                                                                           
root@antMiner:/config# timeout=$((2 ** (32 - * (256 / $chip_num) / freq_m / 64))                                             
root@antMiner:/config# PARAMS="--bitmain-dev /dev/bitmain-asic --bitmain-options 115200:32:8:$timeout:$chip_value:$freq_value:0725 --bitmain-checkn2diff --bitmain-hwerror --version-file /usr/bin/compile_time --queue 8192"
root@antMiner:/config# echo $PARAMS
--bitmain-dev /dev/bitmain-asic --bitmain-options 115200:32:8:5:200:0782:0725 --bitmain-checkn2diff --bitmain-hwerror --version-file /usr/bin/compile_time --queue 8192
root@antMiner:/config# screen -list
No Sockets found in /tmp/screens/S-root.

root@antMiner:/config# start-stop-daemon -b -S -x screen -- -S cgminer -t cgminer -m -d "$DAEMON" $PARAMS --api-listen --default-config /config/cgminer.conf
root@antMiner:/config# screen -list
No Sockets found in /tmp/screens/S-root.

root@antMiner:/config# cgminer $PARAMS -D --api-listen --default-config /config/cgminer.conf 2>&1 | tee log
 [2016-06-02 08:58:19] Global quota greatest common denominator set to 1
 [2016-06-02 08:58:19] Global quota greatest common denominator set to 1
 [2016-06-02 08:58:19] Global quota greatest common denominator set to 1
 [2016-06-02 08:58:19] Miner compile time: Fri Oct 23 16:21:24 CST 2015 type: Antminer S7
 [2016-06-02 08:58:19] Global quota greatest common denominator set to 1                   
 [2016-06-02 08:58:19] Global quota greatest common denominator set to 1                   
 [2016-06-02 08:58:19] Global quota greatest common denominator set to 1                   
 [2016-06-02 08:58:19] Miner compile time: Fri Oct 23 16:21:24 CST 2015 type: Antminer S7                   
 [2016-06-02 08:58:19] Started cgminer 4.8.0
 [2016-06-02 08:59:47] BTM get work queued number:9 neednum:64
 [2016-06-02 08:59:47] BTM: No enough work to send, queue num=10
 [2016-06-02 08:59:47] BTM0: No matching work - HW error
 [2016-06-02 08:59:47] Generated target 0000000000000000000000000000000000000000
0000000000ffff0000000000
 [2016-06-02 08:59:47] Generated stratum work
 [2016-06-02 08:59:47] BTM: Work task queued(9) fifo space(16320) needsend(64)
 [2016-06-02 08:59:47] Pushing work from pool 0 to hash queue
 [2016-06-02 08:59:47] BTM get work queued number:9 neednum:64 [2016-06-02 08:59:47] BTM0: invalid nonce - HW error
 [2016-06-02 08:59:47] BTM: No enough work to send, queue num=10
 [2016-06-02 08:59:47] BTM0: No matching work - HW error
 [2016-06-02 08:59:47] BTM0: invalid nonce - HW error [2016-06-02 08:59:47] Popping work from get queue to get work
 [2016-06-02 08:59:47] Selecting pool 0 for work
 [2016-06-02 08:59:47] Generated stratum merkle 6a4d11683399ff4c147da1f9e0e2bdb9726602b56188e304919e1ed8a456d276
 [2016-06-02 08:59:47] Generated stratum header 00000004db927871dc96870990749d35eb81bcaf08775be60367cb1d00000000000000006a4d116 83399ff4c147da1f9e0e2bdb9726602b56188e304919e1ed8a456d276574ff57818058436000000 000000008000000000000000000000000000000000
000000000000000000000000
 [2016-06-02 08:59:47] Pushing work from pool 0 to hash queue
 [2016-06-02 08:59:47] BTM0: No matching work - HW error
 [2016-06-02 08:59:47] BTM0: invalid nonce - HW error

Have a buyer that issued a chargeback claim to their credit card for a purchase 60 days ago.
Ebay doesn't know about it.
Paypal knows about it but the buyer only filed a complaint with their credit card so paypal will only accept
whatever the credit card decides to do...

As many said some China recepticals can look like 2 prongs but they are bent to side.  Look at top of following picture:

http://www.internationalconfigurations.com/linkImages/74600x45.jpg

So it really is possible it looks straight for transport and goes to side once opened.  I wish the review cybtc did would have covered it.

Unmodded S5 in batch1 and with initial software and only one fan was doing 72dB of "metallic"sound.

This might sound silly, but what I had in mind was 3 people purchasing 2 miners and split them into 3 unique miners with 2 hashing boards each. Ofcourse this would require a extra controller.