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Title: Antminer s7 hash board that don't hash. Post by: SA007 on March 21, 2017, 01:01:51 PM I have 6 antminer S7's and some have a very low hashing rate, only one of 3 boards is hashing.
The strange thing is that I can't find anything wrong, the boards are detected, they have a normal temperature, no x's in the asic's but no hashing at all. I did a firmware upgrade (even though they are at the newest firmware) but that did not help. I don't know which batch they are (second hand). I have 4 board with the same problem: 2 boards with 30 asic's 2 boards with 54 asic's (one shows temperature as 0). Connecting them on different controllers or power supplies or lowering the frequency doesn't seem to help. The 30-asic boards have electrolytic capacitors, they are fine (ESR and capacitance is normal) I have a fully kitted out electronics lab if that helps. Title: Re: Antminer s7 hash board that don't hash. Post by: fanatic26 on March 21, 2017, 03:54:48 PM FYI - there are no 30 asic boards. There are only 45 and 54 chip boards, if you are seeing a 30 chip board that means it is a malfunctioning board.
Title: Re: Antminer s7 hash board that don't hash. Post by: SA007 on March 22, 2017, 08:14:27 PM That is good to know.
The two boards that give 30 asics I just didn't count them and assumed the count in the web interface was correct. But indeed they have more asic's. I'm currently focussing on the 2 54 asic boards that i have here (the others are still in my farm), what is see in the interface is this: http://bitcoin.sa007.nl/brokenornot.png It has only been running 3 minutes here, but also at 30 minutes it doesn't display any x's. In case it helps, I have run dmesg via ssh, it is filled with lines like: Code: [ 111.392938] ch5-as42: dev->task_buffer_wr{0x00001ea0}rd{0x00000022}ret work_id{0x8000} don't match task_buffer_match{0x0000}If I run the same controller with a working 54 asic board, that one stops giving those lines after about a minute and starts mining, the broken board don't seem to start or something. I still don't have a clue what is happening here. |
