S7 ASIC Failure

[Shades01]

3 of my S7 miners have all lost 2 ASIC chains each. This happened about the same time. There was an internet outage earlier yesterday morning. I got them all working and connected again, all 6 of my S7 miners working great. Then about 10 hours later, 3 of mine, the 3 batch 7's I have lost 2 boards each.

I've gone through all of the connectors, everything is seated well. Power supplies have been tested separately, and work fine. They are all running at 625.00M Frequency.

System Overview:
Miner Type   Antminer S7
Hostname   antMiner
Model   GNU/Linux
Hardware Version   1.5.3.0
Kernel Version   Linux 3.8.13 #22 SMP Tue Dec 2 15:26:11 CST 2014
File System Version   Tue Sep 15 16:50:19 CST 2015
Cgminer Version   4.8.0
Uptime   19
Load Average   1.05, 0.87, 0.61


Monitor:
Mem: 78060K used, 173112K free, 0K shrd, 0K buff, 39912K cached
CPU:  40% usr  30% sys   0% nic  30% idle   0% io   0% irq   0% sirq
Load average: 0.76 0.82 0.60 1/75 1840
PID  PPID USER     STAT   VSZ %VSZ %CPU COMMAND
397   396 root     S <   168m  68%  61% /usr/bin/cgminer --bitmain-dev /dev/bitmain-asic --bitmain-options 115200:32:8:7:200:0782:0725 --bitmain-checkn2diff --bitmain-hwerror --version-file /usr/bin/compile_time --queue 8192 --api-listen --default-config /config/cgminer.conf
1839  1838 root     R     2148   1%   9% top -b -n 1
400     1 root     S     5980   2%   0% /usr/bin/monitor-recobtn /usr/bin/factory_config_reset.sh
356     1 root     S     3364   1%   0% /usr/bin/ntpd -p /var/run/ntp.pid -g
372     1 root     S     2980   1%   0% /usr/sbin/lighttpd -f /etc/lighttpd.conf
365     1 avahi    S     2728   1%   0% avahi-daemon: running [antMiner-10.local]
366   365 avahi    S     2728   1%   0% avahi-daemon: chroot helper
396     1 root     S     2616   1%   0% {screen} SCREEN -S cgminer -t cgminer -m -d /usr/bin/cgminer --bitmain-dev /dev/bitmain-asic --bitmain-options 115200:32:8:7:200:0782:0725 --bitmain-checkn2diff --bitmain-hwerror --version-file /usr/bin/compile_time --queue 8192 --api-listen --default-config /config/cgminer.conf
353     1 root     S     2272   1%   0% /usr/sbin/dropbear -r /config/dropbear_rsa_host_key -p 22
420     1 root     S     2148   1%   0% {miner-m.sh} /bin/sh /sbin/miner-m.sh
419     1 root     S     2148   1%   0% {monitorcg} /bin/sh /sbin/monitorcg
339     1 root     S     2148   1%   0% udhcpc -b -t 10 -A 10 -x hostname antMiner -i eth0
1838   372 root     S     2148   1%   0% /bin/sh /www/pages/cgi-bin/monitor.cgi
1840  1838 root     S     2148   1%   0% /bin/sh /www/pages/cgi-bin/monitor.cgi
1262   419 root     S     2016   1%   0% sleep 5m
1768   420 root     S     2016   1%   0% sleep 1m
417     1 root     S     1908   1%   0% /sbin/getty 115200 ttyO0
418     1 root     S     1908   1%   0% /sbin/getty 38400 tty1
1     0 root     S     1652   1%   0% init [5]
103     1 root     S     1640   1%   0% /usr/bin/monitor-ipsig
406     1 root     S     1632   1%   0% /usr/bin/test-btn /usr/bin/test.sh
21     2 root     RW       0   0%   0% [kworker/u:1]
10     2 root     SW       0   0%   0% [rcu_sched]
15     2 root     SW       0   0%   0% [kworker/0:1]
11     2 root     SW       0   0%   0% [watchdog/0]
3     2 root     SW       0   0%   0% [ksoftirqd/0]
2     0 root     SW       0   0%   0% [kthreadd]
5     2 root     SW<      0   0%   0% [kworker/0:0H]
6     2 root     SW       0   0%   0% [kworker/u:0]
7     2 root     SW<      0   0%   0% [kworker/u:0H]
8     2 root     SW       0   0%   0% [migration/0]
9     2 root     SW       0   0%   0% [rcu_bh]
12     2 root     SW<      0   0%   0% [khelper]
13     2 root     SW       0   0%   0% [kdevtmpfs]
14     2 root     SW<      0   0%   0% [netns]
16     2 root     SW       0   0%   0% [bdi-default]
17     2 root     SW<      0   0%   0% [kintegrityd]
18     2 root     SW<      0   0%   0% [kblockd]
19     2 root     SW       0   0%   0% [khubd]
20     2 root     SW       0   0%   0% [irq/86-44e0b000]
24     2 root     SW       0   0%   0% [irq/23-tps65217]
27     2 root     SW       0   0%   0% [irq/46-4819c000]
36     2 root     SW<      0   0%   0% [rpciod]
38     2 root     SW       0   0%   0% [khungtaskd]
39     2 root     SW       0   0%   0% [kswapd0]
40     2 root     SW       0   0%   0% [fsnotify_mark]
41     2 root     SW<      0   0%   0% [nfsiod]
42     2 root     SW<      0   0%   0% [crypto]
45     2 root     SW<      0   0%   0% [pencrypt]
46     2 root     SW<      0   0%   0% [pdecrypt]
53     2 root     SW<      0   0%   0% [OMAP UART0]
54     2 root     SW       0   0%   0% [spi1]
57     2 root     SW       0   0%   0% [spi2]
60     2 root     SW<      0   0%   0% [kpsmoused]
61     2 root     SW       0   0%   0% [irq/150-mmc0]
73     2 root     SW<      0   0%   0% [deferwq]
149     2 root     SWN      0   0%   0% [jffs2_gcd_mtd9]
336     2 root     SW       0   0%   0% [kworker/0:2]
409     2 root     SW<      0   0%   0% [bitmain-asic]
1230     2 root     SW       0   0%   0% [flush-mtd-unmap]


I can send Kernel logs if that would be useful at all.


Here's what all three show:

Start Up:
http://imgur.com/vrZvxmn

After a few minutes:
http://imgur.com/9k6c6Uw


Any help would be great.


Thank you!

[adaseb]

Check to see if its not the power supply, if it isn't send it back for warranty.

[RadekG]

Oh yes, I had the same problem, one board was dead. Two chips overheated and desoldered from PCB. The same syptoms like yours S7. Sent back for RMA, received repaired board.

[Shades01]

Do you remember how long and how much it cost to get the boards back?

[RadekG]

I am in EU, I used priority postage which cost about USD15 and my board came back about a month later by UPS.

[not.you]

You must have missed the posts about this already.  Basically it is a known issue that if the internet goes down the fans do not spin fast enough to cool the boards and they will overheat and fail.  This is only an issue on earlier batches (not sure which batch it was finally fixed on) and only if you have the fans set to auto and never updated the firmware.  There is firmware that fixes this but it has been pretty well established that setting fans to manual above 60% or so will keep this from happening also.

[Shades01]

My fans have been set to 80% manually since I first turned them off, so that is not the issue.