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Author Topic: s7 problem - one board showing very low temp PLEASE HELP  (Read 55 times)
Viper man
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December 28, 2017, 06:25:00 AM
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Hi guys, i'm new to mining and just hooked up a used s7 today.  When i check the antminer status page, it shows 2 boards with normal temps of around 60 deg. but board #1 shows very low temps of around 15 deg.  I've tried to do a factory restore and it didn't help.  Asic status shows all zero's, no x's or missing values.  Only hashing around 3th/s.  Bad board?

Can someone point me in the right direction?  Thanks for your help!
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Raymond_B
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December 28, 2017, 06:38:42 AM
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Hi guys, i'm new to mining and just hooked up a used s7 today.  When i check the antminer status page, it shows 2 boards with normal temps of around 60 deg. but board #1 shows very low temps of around 15 deg.  I've tried to do a factory restore and it didn't help.  Asic status shows all zero's, no x's or missing values.  Only hashing around 3th/s.  Bad board?

Can someone point me in the right direction?  Thanks for your help!

A while back I picked up an S7 off Ebay. It appeared in really good condition so I put it straight to work without a thought. But every so often, about once a day, it would do like you describe. One board would stop hashing, no errors that I could see other than low temp. Since it was old and out of warranty I pulled the fan screws and then the other 4 screws that retain the end cap which in turn retains the hash boards. With that off and all cables disconnected (power and controller connectors), I slid each hash board out for inspection. I honestly wish I had taken a picture, but on one of the boards there was a giant moth partially against the heat sink and PCB. I don't know if he was grounding something out or just overheating one chip, but after his removal it's been working away for roughly 9 days now and no issues.

Long way of saying, probably best to remove the hash boards and inspect them for dirt, debris, or damage.

dlezama
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December 28, 2017, 06:53:22 AM
 #3

Hi guys, i'm new to mining and just hooked up a used s7 today.  When i check the antminer status page, it shows 2 boards with normal temps of around 60 deg. but board #1 shows very low temps of around 15 deg.  I've tried to do a factory restore and it didn't help.  Asic status shows all zero's, no x's or missing values.  Only hashing around 3th/s.  Bad board?

Can someone point me in the right direction?  Thanks for your help!

A while back I picked up an S7 off Ebay. It appeared in really good condition so I put it straight to work without a thought. But every so often, about once a day, it would do like you describe. One board would stop hashing, no errors that I could see other than low temp. Since it was old and out of warranty I pulled the fan screws and then the other 4 screws that retain the end cap which in turn retains the hash boards. With that off and all cables disconnected (power and controller connectors), I slid each hash board out for inspection. I honestly wish I had taken a picture, but on one of the boards there was a giant moth partially against the heat sink and PCB. I don't know if he was grounding something out or just overheating one chip, but after his removal it's been working away for roughly 9 days now and no issues.

Long way of saying, probably best to remove the hash boards and inspect them for dirt, debris, or damage.
So it was just a bug, nothing to see here Smiley
Raymond_B
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December 28, 2017, 06:55:23 AM
 #4

But it's such a fun story to tell Smiley

castiel0504
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December 28, 2017, 03:08:24 PM
 #5

Did you DEBUG it?  Grin Grin Grin
Viper man
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December 28, 2017, 05:04:05 PM
 #6

Thanks for the help!  I was cleaning out the boards and noticed the white 18 pin interface cable was nicked up. This seems to be the issue. Besides getting one from Bitmain or from ebay that are all overseas, anywhere to get one quicker?

Thanks!
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