1st thing in my mind.... PSU
Please make sure you are using a PSU with 2 +12v rails and each PCI-E cable is coming from it's own rail. (Not 2 PCI-E connectors from 1 cable)
If the above is not the case, if you feel confortable unscrewing the hashing PCB on the network port side and other hashing pcb and swap it. Then turn on the antminer with 1 blade only. If it still shows many XXXXX then, it's time for the RMA to get a replacement Hashing PCB
Just got an S1 in today and hooked up. I have a section of ASIC status all xxxxxxxx and only running 156 Gh/s(avg). I switched the PCI-e cables around and still the same. Upon further inspection I noted that the RF led is not a steady flashing rate on one of the blades. Only flashes a couple times every other second or so. Definitely not behaving like the RF led on the other blade. Anything I can take a look at?
easiest way to check is to measure the voltage with a multimeter across the two legs of the inductor (grey cube above the faulting 8 chips). You should pick up a voltage of 1.1V - If this voltage is not present it means those chips have no power. I had a similar issue with my second batch antminer but it was the first 'segment' on the board that had no voltage, thus none of the 32 chips on the side worked. Bitmain was very good at shipping me a replacement PCB
Thank you for the tip. I measured voltages at various points and these are my findings:
Red: 11.56V so juice is definitely getting into the board.
Yellow: 1.1V is present here
Green: this capacitor is supposed to be around 12V, right? Yet it measures much lower and the voltage is dropping as I measure it.
Can you recommend if this can be fixed by me: a have a mobile phone repair guy, who is very good at soldering, so if I can replace something then I'd rather fix it myself.
Or if it is not easily replaceable then I would rather have a small refund as only 50GH/s are not working, which is 28% of the miner.
My immediate impression is that your 12V DC power is far too low. Equipment will not handle well outside of a 11.7-12.4V range and it is almost certainly your PSU being a bit too weak for the job, or running long 18AWG cables that are losing voltage across the distance (partially as the cables getting warm).
I *imagine* that the all 3 capacitors should act the same way when tested - its possible that one might be poor quality and shorting/draining when tested with the meter.
2ND THOUGHT: I am not sure how the power is given from the 12V in to the 4 'segments', but if it is a chain across the the 3 capacitors in a rightward direction the capacitor could be broken and the multimeter is causing the connection to complete, but designed not to carry the required amperage through its probes -> hence voltage drops without a valid circuit. I am not an electrical engineer though, so a 2nd opinion would be a good idea before you take the soldering iron to it. If it is the capacitor, it would be a very easy fix if your friend has the tools for fire-point soldering and some experience with phones. (I personally have only a larger iron so I would not attempt a smaller component like that without buying a new tool or two)
By the way, which section is the one showing all x's? The second one I imagine?
Hi,
I know it's a bit too late, but I faced the same problem today with my S1.
Eventually a buyer came to pick up the miner from me, it's been already paid, when we noticed that only one of the blades was working.
I've given back the money and started looking for what's causing the problem.
The LED on the secondary blade was only blinking slowly and it was totally cold and it did not show up on the web UI at all.
I previously did a voltage mod on the unit, so I started to look around R3.
I also had the same measurement results as Cyper had above.
Noticed that the resistance was about twice on R3 than it should be, sth about 9.6k.
Looking at the resistance values around (R12, etc) I figured out that R3 must be fully open, like it's burnt or something.
So I took off R3 and guess what, it showed infinite resistance. Somehow it was slowly getting burnt out in the past few weeks, without any external influence to the point today when finally the blade wasn't able to work at all.
I replaced it with a 10k pot, adjusted it to match the resistance of the other seven and now it's working alright.
So, if your miner breaks down like that, start investigating around R3 and so on. If it's a second hand S1, the previous owner might have had it undervolted and damaged the resistors, that began slowly degrading.
I hope that helps someone.
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