Buenas yo tambien tuve problemas con un S7 y le escribi a soporte de bitmain y me respondieron despues de varias pruebas determinamos que una de las hashboards estaba defectuosa y me recomendaron enviarlas a reparar.
les escribi esto (chequea si es la falla que te esta dando a ti siguiendo el link que señalo yo aqui a continuacion)
Hi I have the same problem with my S7 that Mr Rafael Vargas on
https://bitmainhelp.zendesk.com/hc/en-us/articles/220872007/comments/115000119668So that it can work I have to reboot and it work and the hash rate is around 10-20 Ghs/s the temperature is 55-65 celsius but almost ever the S7 dont let me check his status.
The S7 V1.31 and the power supply are brand new from bitmain.
Please help me the S7 work well 24-30 hours when It was new well and after this time the hash rate fell to zero
Me respondieron y..
Primeramente me recomendaron actualizar el software del minero...
Please try upgrading the firmware. Here is the link to the firmware files. You need to choose the file that matches the board frequency and number of fans on your miner:
https://shop.bitmain.com/support.htm?pid=00720160511022802617GoPmQhNb06CFRun the miner for 20 minutes after loading the firmware.
lo hice y nada...
Me respondieron....
At least one hash board is faulty.
Please test each hash board separately to determine which one is defective.
To test each hash board separately: keep the PSU connectors and controller cable on one of the hash boards connected and disconnect the cables from the other two hash boards. With the miner running you can see the status of the connected hash board.
Here is more detail:
http://support.bitmain.com/hc/en-us/articles/226142788-Testing-hash-board-one-by-oneOn the miner status screen defective chips are displayed as "xxx", "---" or " ASIC≠45(s7) or 63(s9)"
Since your machine is out of warranty you can either ship the part to us in China for paid repair, or you can use our out of warranty repair agent in the United States. In China our fee for hash board repair is 200-300 RMB (approximately $35 USD) plus shipping, per board
Al final detecte cual era la que estaba fallando y la deje desconectada el equipo esta trabajando con 2 de 3 y produce 3,2 - 3,5 Thz mientras el dueño se decide a mandar a reparar la hashboard defectuosa...
cada vez que inicies el minero debes esperar de 15 a 20 minutos para que comience a trabajar bien, yo a veces por la desesperación no esperaba tanto tiempo y reiniciaba el equipo y seguia en lo mismo...
espero poder ayudarte...saludos