In a normal world I would assume it's a dead hashboard, but since this happened after a power cut/failure -- it could very well be your PSU.

First thing first, visually inspect the 6 pin connectors on you Chain[J6], you can follow the ribbon cables going into the control board to identify which one is J6, if it's the default arangment this should be the board on the left side when you facing the miner, now if the 6 pin connectors are good, then simply unplug the other two hash boards, saw the connectors and the data/ribbon cables from another board and test this one board alone.

Also, in many cases, a simple Sd-card flash can fix many of these issues, your control board might have had some issues during the power failure and just needs fresh firmware, so don't discard that.

If you can not afford 2.4kw then you can not count on AC,  to cool a few miners the size of s9 you will need at least 18k btu/h AC which will easily draw 2kWh.

The best solution would be underclocking your miners to the lowest settings possible until the summer is over, any other solution will either draw more power or create a lot more noiese. 

Because I have bigger balls than these three fine gentlemen, I would like to add that small bit of % and say it's 100% scam, (just kidding, of course, only about the balls' part).

OP, are you aware that MiningRigRental, Nicehash, and other platforms have a HUGE amount of hashrate for "rent"? mind you, more often than not, the cost is just 100%+ some fees, so if a miner makes 10$ a day, you can almost always rent it for 10$ + a small fee, so it's not like the world has hashrate shortage issues and someone would offer you 50% extra on top of that 100%, if they desperately need to rent hashrate, they can acquire it from all those famous platforms, so why would anyone pay you anything extra when they can buy it there? it MOST certainly and 100% makes exactly no sense.

انت لست مخطاء, والموضوع لا يحتاج لاي دراسة, POW هوا اكتر لامركزية واكتر امان للعملة (طبعا دون التعصب المطلق يوجد ايضا ميزات اخرى لل POS تميزه عن POW) ولكن لكونك تكلمت عن هده النقطة فدعنا نركز عليها قليلا.

الهاش ريت الحالي للايثيريوم يقدر بحوالي 1,200,000,000    ميقا هاش, يمكن توقع متوسط كروت التعدين ب 50 ميقا للكرت (طبعا هي تتراوح مابين ال 20 الى 70) بالمجمل, ولكن لنأخد الرقم 50, هدا يعني انه لدينا 24,000,000 كرت يعدن الاثيريوم, متوسط استهلاك الكرت حولي 100 وات وهدا يعني حوالي 2,400 ميقا وات وهوا يعادل الاستهلاك الكامل بعض الدول, حسننا ماذا يعني هدا بالنسبة للامان والامركزية؟ هدا يعني ان اي شخص يحاول التلاعب بالشبكة بالحصول على 51% من قدرات التصويت, يجب عليه شراء اكتر من 24 مليون كرت, وتوفير اكتر من 2400 ميقا وات لكي يحقق هدا, هدا الامر ليس سهلا ابدا ليس فقط من جانب التكلفة ولكن ايضا من جانب التخفي وعمل كل هدا بدون ان يعرف بك احد.

تخيل انك تمتلك مليارات الدولار, كيف ستتمكن من شراء 30 مليون كرت مثلا؟ هل ستجدها اصلا؟ كم ستحتاج من الوقت لتوفرها لك تلك المصانع؟ كم ستحتاج لتوفير كمية كهرباء ضخمة مثل هده؟ والاهم من ذلك كيف ستفعل كل هدا بدون ان يسمع بك العالم كله؟ ان لا اقول ان هدا مستحيل, ولكن قارن هدا بامكانية شراء نص مخزن الايثيريوم بحوالي 100 مليار فقط, طبعا لن يكون الامر سهلا جدا ولكن بكل تأكيد هو اسهل بكتير من ما سبق ذكره بخصوص POW.

اضف على ذلك, جانب اللامركزية, في التعدين, اي شخص يمتلك 200$ وكهرباء وانترنت قادر على المشاركة في الشبكة, فالبرغم من وجود احواض التعدين الا انه في النهاية الهاش ريت يكون ملك الشخص الذي يمتلك الكرت ويمكنه ان يعدن لوحده او الدهاب الى حوض اخر في 10 عشرة ثواني, اما مع POW يتجوب عليك امتلاك 32 قطعة وهدا يعادل بالسعر الحالي المنخفض حوالي 60 الف دولار, كم تعرف شخص يمتلك 200$ وكم تعرف شخص يمتلك 60 الف دولار؟ هدا سوف يعطيك انطباع بسيط عن فارق اللامركزية.

طبعا يمكن ان يأتي احد ويقول لنا انه يمكن استخدام المنصات لعمل staking بكمية اقل من 32 ولكن هدا لايغير في الامر شي, نظرا لانه عند فعل هدا تكون قد سلمت نهائيا في عملاتك وقدرتها على التصويت داخل الشبكة مقابل "فتات" تتحصل عليه من المنصة, اضف الى ذلك انه لايمكنك ببساطة تغير نقطة ال staking الخاصة بك فهي محجوزة لمدة 6 اشهر او سنة, اضف الى ذلك ان العائدات ستكون حوالي 5% سنويا وهدا الشي في الاساس ليس مغري لمعظم الناس وهوا مغري فقط للاشخاص الذين يمتلكون مليارات الدولار ف 5% لشخص يمتلك مليون عملة ايثير ويضعها في عقده خاصة به هوا امر جيد اما لشخص مثلي او مثلك يضع كل مايملك وليكن مثلا 3 ايثيريوم داخل منصة قد تغلق ابوابها في اي لحظة فقط للحصول على 5% هدا الامر غير منطقي.

كل هده الصعوبات والمشاكل سوف تؤدي وبدون شك الا مركزية العقد, سيينتهي المطاف بعملة ايثيريوم ان تكون خاضعة للسيطرة الكاملة من قبل 5-10 شركات كبيرة تمتلك كميات كبيرة وتتشارك بقوتها في التصويت, طبعا ان لا اتوقع ان يقومو بمهاجمة الشبكة او اي شي من هدا القبيل لان اموالهم ستكون بها ولا يمكنمهم الخاطرة بمثل هده الاعمال لانهم يسخدلون لغرض الكسب وليس لاتبات انه يمكنهم تخريب الشبكة, ولكن المشكلة هنا ان السلطات المركزية سوف تتمكن بكل سهولة من تنفيد كل قرارتها عبر ال 5-10 شركات وهده نقطة ضعف كبيرة جدا جدا ل POS.

لم تحاول السلطات تقيد البتكوين او الايثيريوم فيما سبق لانه لايوجد شخص محدد يمتلك قرار هده العملات, وجنسيات وشخصيات المعدنين واحواض التعدين التي تعد بالملاين او الالف لايمكن حصرها وحتى ان تم حصرها لايمكن اجبارها جميعا على تنفيد القانون, فمثلا الولايات المتحدة لديها قائمة عنواين بتكوين محضورة واي حوض تعدين يتم تأسيسه من قبل شركة في الولايات المتحدة عليه ان لا يضيف تحويلات داهبة او قادمة من تلك العنواين, ولدينا مثال على ذلك وهوا شركة Marathon الامريكية التي قامت بالفعل من حجب بعض التحويلات لانه ملزمة بعمل ذلك, ولكن هل سمع احد منكم بهدا ؟ هل اكترث اي شخص لهدا الشي؟ لا ! لانه تم قبول هده التحويلات في تاني بلوك من قبل حوض تعدين غير معرف اصلا وباسم unkown.

طبعا كل هده الامور سيكون تنفيدها اسهل بكثير على POS.

اضف الى ذلك ان تجربة POS لاتزال جديدة نسبيا ولا احد يعلم كيف ستكون وماهي المشاكل الاخرى التي يمكن ان تظهر في الطريق, عندما تم انشاء عملة ايثيريوم كان ال POW قد اتبت نجاحه مع البتكوين بالتجربة العملية ومئات الالاف من التحويلات, اما الان هل يمكن لاحد ان يسمي عملة قائمة على POS وموجودة في السوق مند سنوات طويلة ولم تعاني من مشاكل؟ بالرغم من ان هده النقلة سوف تتيح للايثيريوم امكانية التطوير السريع واضافة اشياء غير ممكن اضافتها على POW الا انها مخاطرة كبيرة جدا جدا والايام فقط هي الكفيلة باخبارانا حول نجاح او فشل هده التجربة.

You get it by randomly hashing a nonce, this is how Bitcoin mining actually works, the difficulty target is pretty small, getting a hash result below it is incredibly difficult and needs a ton hashing power.

I can't really understand the logs you posted, but to answer your question, one bad chip can stop the whole board from working, and usually or most often I might say, it's one bad chip that needs repair, using the text fixture alone isn't enough, you will need to measure the voltage on each chip, you may also visually inspect the chips and look for solder balls that are shorting a chip or two.

It will depend on how lucky you are, these hash boards come in with a fixed voltage input stored in the EEPROM, and the control board will want all of them to be matching, so if you happen to mix and match a few hash boards and one of them was not in the same voltage input the miner won't start hashing, you can solve this by one of two ways.

1- Use custom firmware like Vnish which doesn't read the voltage value and will allow any hashboard with the complete asic count to run.

or

2- Get the tool from Zuesbtc to copy-paste the values on all hash boards so that the original firmware will see them as "matching" and allows you to run them.

With that said, I don't think you should waste more money buying another piece of junk, if you can cheaply fix these hash boards go for it, if not, sell them as is for whatever price, along with the spare PSU you mentioned you tried, and get a proper mining gear that won't break again in a few weeks/months, avoid the 17 series of Bitmain at all costs.

Indeed, nobody should be exempted from criticism, I was not implying that you should not point fingers to Braiins, I was merely trying to say that just because Bitmain claims other firmware are viruses it does not mean we should believe them, in the same way I would not trust Braiins with fees stated on thier website without examining that myself.



My English is far from perfect, but the way I understand the link you posted is 10% of the fees stated, so fees*1.1 or fees*0.9 not 100%*0.1, but your title states 10% of 100% which is why I think it was taken out of context, but I don't disagree with the fact that the statement could be interpreted in a different way and that they have to be more detailed.

I don't even want to discuss the efficiency difference between the stock firmware and the custom firmware, I have tested them on hundreds of miners, and the auto-tuning on custom firmware makes my gears more effienct and run a lot cooler, while I don't use BO+ (I use a different famous custom firmware) I would like to point out something regarding the fees.

At least for the ones I tried, the perctange is time based, the software assumes your miner will run for 24 hours straight, so that's 1,440 mins, so it needs to mine to the devfee pool for 28.8 mins to get a 2%, but they won't let you mine to your own pool for 1,411.2 mins and then take their 28.8 mins, they will split the 28.8 mins into short intervals, which usually starts in the first a few minutes after the miner get's to it's peak/stable hashrate, so let's assume they wait for 2 mins to get their first 28.8/24 mins, so you get 2 mins on your pool and then they get 1.2 on theirs, at this point the fee is 26.66%, it only becomes 2% if the miner runs for a whole hour and they get only 1.2 mins, but if your miner is tuning or restarting for whatever reason, the fees will be a lot higher.

the above was just an example, I don't recall the exact figures of how the brain or even the firmware I use goes about collecting fees, but I have carefully inspected the fee collecting process and you can only come to a conclusion after letting your miner mine for long enough, I am not saying your concern is wrong, but I saw someone claim that some custom firmware fees were like 30% simply by counting the accepted shares, but then he ignored the fact that the devfee pool had a very low difficulty and thus had a dozen more accepted shares than the main pool.

I would suggest a somehow accurate way to confirm the fees, use the stock firmware at default settings, mine to a pool for 1 week and then get your week average hashrate, use BO+ for another week and see your new average hashrate, I am positive it won't be anywhere near 10%, not even 1% higher than the claimed fee.

Now regarding their shady way of dealing with the license I have nothing to say about that, you presented your case nice and clean.


That doesn't mean bitmain is a guardian angel, they lock their firmware in a very disgusting way, you can't even change the fan speed, the only firmware that had a few options was the multi-option firmware for the S9 and after that you could hardly do anything with your miner, besides, bitmain don't want to deal with support/warranty tickets, overclocking your miner makes it more likely to break.


Just another false claim by the devil Bitmain, in fact, most viruses I heard of or dealt with personally like Nightswitcher, Antbuild were in the stock firmware, of course, that doesn't mean custom firmware are not subject to the same viruses, but after all, most of these viruses are the result of reckless actions take by the miner's owner.

In the end, as I said, I don't use BO+, I wouldn't advise anyone to not/use it, but I think it's somehow unfair to read out of context and claim the fees are 10% without having had a proper test.

Ok maybe that is one of the issues but it is not everything, i recall testing some of the cards by sending music/movies files to them and was able to view them on my phone.

The fake cards are usually fake in volume, an 8gb shows on your PC as 32gb, but then, the firmware is pretty small, so even if the volume is fake it should still be able to handle the file.

It could also be the card reader, the copying process, it could be anything mentioned in the post above this one, just one advice, you find a card that works, label it and save somewhere safe.

According to Bitmain's own recommendation, the SD card size should be LESS than 16GB, Also I personally had a few issues with a few SD cards, maybe because the ones I can buy locally at the Computer/Mobile shop are not original, but it took me a few SD cards to actually get one that works well on flashing those gears, I didn't have the time to investigate the technical differences and why one SD card would work while another won't, but I know for certain that some of them just won't work.

Those batteries look neat, but they cost an arm and a leg, but anyway, using any type of battery for mining operations is a terrible idea, you can run the math and it looks ugly, batteries are just so expensive, despite all the new tech in the batteries industry, in respect to how powerful computers are and how much power they need, batteries are still in the realm of" a few hundred years late", in fact, anything except for large hydro power stations will not make sense when it comes to mining.


There is really no guarantee that this will be the case, I rather mine with expensive but stable power than free and unstable power, places that have power outages usually have more issues to deal with like voltages spikes and drops, besides the constant off-on on the miner can be bad, miners LOVE to run in a passive state, most of the issues will happen during the power-on/off phase.

Also, OP needs to know exactly how long those outages last, is it a few seconds a day? half the day without power? I mean let's just assume it's 12 hours a day, that means your ROI time is 2x, and given that we all are in a race against difficulty, you may never ROI before the gear becomes completely worthless.

The issues I explained earlier can be solved, you can protect your gears from spikes and drops using some tools that are not very expensive, so the real question boils down
(How many hours in a day do the power outage last and how much do you pay per Kwh for when the power is back) without knowing these exact two answers, it's just a shot in the dark.

True, but those are Hydro and future orders, I was talking about spot prices, they have generally gone up in the past couple of days, even the used ones, by the way, the Hydro requires 3-phase power and has to be installed in Bitmain's own container.

S19 XP spot price is 8.3k in Malaysia which is good for U.S miners (no China tax), the Sep future orders for the same gear are about 1k lower, on the other hand, S19j sells for nearly half the price per TH, not sure why would anyone pay almost double for 21w/th vs 29w/th is it even worth it? your power rate needs to be so high for that to make sense.

That was a temporary slow down which only lasted for a day or two, here is the current status



I also noticed that gear prices went up slightly in the past couple of days, it seems like many people are actually buying unlike what most of us think, the current ROI on gear is just way too long at least in terms of BTC, if I want to spend cash and had the options to buy gear at current prices or simply just buy BTC I sure as hell won't buy 2 years ROI gears, but many they think the difficulty will drop somehow which doesn't seem to happen, the price crashed and yet the difficulty keeps going up despite everything.

The pace has picked up real fast, I think it was at about 95% for the first 100-150 blocks, so it's likely that we keep climbing higher, is the heat wave in texas over or have they managed to increase their power supply and allowed miners to turn back on? I hope the -5% we had won't be very short-lived.

Avalon 841, got like 40 of them, they suck to be honest, they are far from stable according to my own experience when i compare them to other gears, however, to be completely fair i got them used not brand new.

With that said, and seeing people complain about the newer models of Avalons, i will probably not buy any of them in the near future. 

You don't need UPS, you need a voltage stabilizer/ regulator, keep in mind these terms get abused by marketing, some label that tiny stuff you plug in the wall as "voltage stabilizer 230v" to trick you into thinking that they will step up the voltage if it goes below that while in fact, all they do is cut the output when voltage drops, that's more like "voltage protector", the stabilizer I am talking about consist of real transformer that is capable of actually providing a 220v output regardless of the input (of course within its' promised range).

NT (Chinese) and Lioa (Vietnamese) make some good voltage stabilizers at a very good price, I have tried both but I prefer Lioa, they have different types and prices, the main difference would be the size in KW and the lower bound voltage, as it ranges from 50v to 150v, the ones that can bring 50v up to 220V will cost a lot more, just be careful with sizing these stabilizers, if it says 20KW you only get to draw that much if the difference between the input voltage and the out voltage is almost nothing, the lower the input voltage gets the less of an output capacity you get, below is a simple chart made by Lioa explaining that



Source: http://lioa.com.vn/en/san-pham/ap-ap-1-pha/automatic-voltage-stabilizer-1-phase-0

An example, if your input voltage is 90v, you lose half the capacity, also keep in mind most of these products state the capacity in KVA which isn't exactly the same as a KW, you should always use a power factor of 0.85 to be somehow safe.

So a 20KVA stabilizer gives you a max capacity of 17KW, say your lowest input voltage is 150V, then you lose another 25% so that leaves you with no more than 12.75kw.

NotFuzzyWarm could probably chime in with more "electrical knowledge" since mine is pretty limited.

See the irony, we are now happy with 23k btc and 2.7T difficulty  .


Anyway, the pace has slowed, even more, we should adjust to the next epoch in 2 hours at most, we will go back to Feb - March levels, sadly the price at that time 2x the current price.

                       

اعتقد ان تسمية منصات الاقتراض او الاقراض بمنصات يعتبر غير عادل نسبيا, ان قارنا منصة باينانس ب منصة سيلسيوس سنجد ان الفرق شاسع, باينانس مثلا قائمة اساسا على التداول بينما سيلسيوس فهيا قائمة على الاقراض, فلا نستغرب تصريحات محامين الشركة بقولهم "مستخدمي سيليوس تخلو عن حقهم القانوني في اموالهم بمجرد ارسالها الىنا" وقد تضايق الكثير من الناس من هده الجملة بينما وفي الواقع انا هده الجملة صحيحة بنسبة 100% لانه عند استخدامك لهده المصنة ان تقوم "باقراض" اموالك "لشخص ما" في مقابل الحصول على نسبة عالية من "الارباح" ولايوجد اي ضمانات من ذلك الشخص.

طبعا الجميع يعلم انه من الغباء استخدام منصات التداول لتخزين العملات, بالرغم من انا منصات التداول أمن من منصات التداول بمراحل, مما يعني ان وضع اموالك في منصات الاقراض يعتبر غباء مركب من وجهة نظري, من المؤسف ان كل دروس الماضي لم تفيد هاؤولاء الاشخاص, ولكن يبدو ان هده غريزة بشرية, لانه من الصعب على الانسان التعلم من اخطاء غيره ويجب ان يخطاء بنفسه لكي يتعلم.

Delete the first point because it's not related to this board and your topic might be moved to altcoin because of that.

You also forgot to mention the most common issue, which is incomplete chip count on one of the hash boards, that gets your miner into a restart loop to infinity.

Good efforts, keep it up.