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can anyone advise here or on PM
my latest S9 just lost a board in other words it was working fine for about 24 hours then i made a psu change and it just stoped hashing. two interesting details, one, the miner detects the board but no its not hashing at all GH/S(RT) shows 0000, two, if i connect that particular board by itself it does hash, but only by itself.

any input or advice will be greatly apreciated

i tried diferent psu
and i tried changing resetting all settings
same result

Which brand of psu's are you using?

\

i tried both bitmain psu and HP

I have been using the same LEPA PSUs for 2 years, first on AntMiner S7's then on S9's without any PSU problems at all. I've had S9 hashboards fry, but not from the power supplies. The hasboards that fried were always in the one S9 that I have which is Batch 1. I am fairly certain that it is an overheating problem. I have two hasboards out of it now, sent off to Bitmain Warranty in Colorado for repair. When they come back, I am going to underclock that S9 to 600 rather than the default 650 and hope that fixes the problem. In case anyone is interested in the model of PSU I use, they are LEPA G Series G1600-MA 1600W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Power Supply. I can't speak for all of them, but my anecdotal testimonial evidence is that I have had 3 of them running for 2 years solid, without a minute of downtime other than a couple brief power outages to my house for a couple hours or when I manually shut them down to remove the hashboards to send in for repair. The PSUs themselves have never had any problem, even when running the S7s, which used more wattage than the S9s. When I had the S7's I would have at least 2 industrial surge protectors burn out completely, frying the circuit breaker to toast, per month. That was sheer agony. I couldn't find a surge protector that was S7-proof. I have never had one fry with my S9s.

my S9 are auto
how can i underclock it?

Log into your miner. Click on Miner Configuration. Go up into the ip address. Delete the word "Configuration". Type the word "Advanced" with the capital "A". Hit enter. Choose the frequency you want.

tournamentdan

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