Well good luck with replacing s7 chips. Per Sidehack the combination of the heatsinks being glued to the top of the chips and the very-fine lead pitch all but makes cleanly removing/harvesting/reusing s7 chips near impossible. You better have one heck of a pre-heater for the boards and good hot air tool to pull the chips.
Do please let us know if you are successful!
Will do. Luckily I have a very nice rework station in our electronics lab and a set of keys. The Spondoolies SP20s were very awkward to do as the ASIC chips came on a sub board so I'm hoping that these are a little easier. I can see the problem of getting rid of the heat sinks without pulling tracks from the board though. One card I have coming is partially burned so I've got some practice on that one. Wounded if sidehack has any ideas of the ASIC layouts might drop him a PM. Probably be Christmas when these boards arrive so I'll get some pictures up when I'm working. Then I'm going for it and going to repair a working miner. |
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In oil immersion would if be better to throw the fans away and use an oil pump to circulate the oil round a small cooling radiator then introduce back to the immersion tank? A decent oil pump would be required but with some small bore tube I would probably make some jets to introduce a high flow over the cards. Just food for thought.
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I recently decided to embark on the immersion of Antminers in mineral oil. Currently I have one S5 running smoothly inside the oil, and I am very satisfied with it. It is averaging 1.3-1.4TH at 40 degrees and the fan is running fine. However, yesterday I tried submerging my first S7 (the variant with only 1 fan), and that didn't go as smoothly. When it's starting up, the fan spins for a few seconds and then stops and continuously tries to boot up. I tried unscrewing the fan from the rig and holding it above the oil. When I did this, the miner started hashing normally.
Basically, I was wondering if anyone had any insight on how to remove or disable the fan on an S7. I tried removing it, but the miner doesn't want to run unless their is an operating fan connected to it. Overheating and fire are obviously non issues if I can maintain 40 degrees. Therefore, I would like to just ditch the fans altogether and just use an external source to circulate the oil. I would appreciate any help you could give me.
At worst case probably read the PWM pin from the miner into an Arduino or similar then feedback a pulse signal to the miner to emulate the Tacho connection from the Arduino. Should be easy to do in software by say setting miner at 20% then reading tacho pulse frequency on a scope. Thinking about it you could probably then ditch the PWM pin, leave the miner at way 20% fan speed and just feed a pulse back to the miner. Something along those lines ...... |
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Wrong section I'm afraid. This is the Marketplace for buying and selling.
You want the "hardware" section which is a subforum of the "Bitcoin" -> "Mining" -> "Hardware"
Sorry could moderator please delete this post when possible. Re posted in 76.0 and locked this thread. |
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Hi.
Does anyone have a layout showing the ASIC order for an S7 hash board.
So for example in the GUI if the third ASIC shows X which physical chip it relates to.
I've never seen past the heat sinks on a board yet so I guess the chains and chips could be on the legend.
I've got some partiality dead cards coming my way so just starting to prepare to lift and swap some chips to try and repair some hash cards. I had a good success rate on the old SP20's when I was doing them.
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Hi.
Does anyone have a layout showing the ASIC order for an S7 hash board.
So for example in the GUI if the third ASIC shows X which physical chip it relates to.
I've never seen past the heat sinks on a board yet so I guess the chains and chips could be on the legend.
I've got some partiality dead cards coming my way so just starting to prepare to lift and swap some chips to try and repair some hash cards. I had a good success rate on the old SP20's when I was doing them.
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I've sourced 5 x faulty S7 hash cards from a user in the USA so I'm no longer offering on this item.
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I assume you mean the pi is working and interface via browser, but hashing boards are not being detected but lights up?
I might take a punt at this, but depends on what your asking, escrowed of course.
shipping to UK
Exactly, have tested new cables from io to hash boards but no resut. no price in mind. escrow is fine. £200 gbp for the pair plus shipping? Might be looking to strip the ASIC from the PCB to repair existing hash cards. |
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I've got troubles with a few S7 Miners looking for replacement hash boards.
54 ASIC boards would be good.
Would also consider faulty miners complete.
I'm in the UK please let me know.
Depending on price and who you are, may have to escrow I would pay the fees.
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s7 batch 9, they were supposed to work, they dont, io board seem working , board dont get recognized have tested several ios.
Do you have a price in mind? I need some S7 spares, have a few miners with troubles. I'm in the UK so shipping here also. |
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Nearly.
Some voltage drop I'm going to run this on the bench tomorrow and tweak the PSU's to 12.5v at the Miners.
I've dropped about 0.12 th/s on this miner.
Luckily the DPS-1300's have a potentiometer under an easily removed cover, rather than taking the whole power supply apart.
I've nearly made a small PCB with three soldered PCI-e receptacles and an XT60 on it.
The idea is for the PCB to push straight onto the miner then plug into the power supply.
The PCB is a paxoline sheet with two 1.5mm thick copper bus bars glued on it then drilled.
I'm using a 100 watt iron and an SMD rework station to get the heat up on the copper to solder, whilst resting them on a sandwich toaster hot plate I made a couple of years back.
It's not a PCB as PCB's go, but I've got a much larger chunk of copper to handle the power.
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Bit more pool hash rate today getting us more blocks.
Aren't we running around the "sweet spot" right now.
Always seem to smash them out at around 35 ish.
A good day so far.
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I'm sorry for the bad luck, I think it was my fault...
I've gotten back in to mining in the last couple of weeks with an S3+ and a couple of SP20s and the pool had a dry spell. Today one of the SP20s has lost a hashing board and this evening the other has disappeared completely off the network, and the pool starts finding blocks!!
And of course the miners are at a remote location where I won't be able to check on them for a couple of days :/
Nope, the bad luck wasn't your fault, it was all of the S9's  I think it is because of election day here in the US. Just like how the gas prices go down before the election... i have 4 S9's with 49TH/s and never found a block here!
Are you being serious? But how long have you mined here? 'Fortunately' the bad luck here seems to be just that - bad luck. Things don't change one way or the other due to anything but bad luck, unless someone has a large amount of hash power to affect the luck. -- Some simple ways to look at it: If the pool was 30PH/s and someone added a mystical 5PH/s of 'bad luck', we'd still expect to find 30PH/s worth of blocks. Miner A (bad luck) can't magically effect everyone else's miners  or To have a 10% affect on expected luck (yeah ONLY 10% effect) someone would have to add 11.1% of 'bad luck miners' (never finding blocks) to the pool. So at 30PH/s, they'd have to add 3.3PH/s of 'bad luck miners' -- So what's most likely happening? Nothing - luck is just swinging around as it does ... that's called variance  It goes up and down ... and up and down ... and ... The smaller the pool (compared to the network) the higher the variance. -- Block! Luck, if only we could adjust it for personal gains ........ It's been a good day today mining here I'm happy! |
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Hey guys. I picked up 2 Spondoolies SP30's the other day. After taking them apart, cleaning them and adding new thermal paste, one unit is giving me an issue. It will run and hash for about 30-40 minutes and then shuts down. It will eventually start up again but then shuts down again. Sometimes after minutes, sometimes it runs much longer. Anyway, I was wondering if one of you guys can take a look at the System Log and see why. The only thing I noticed was loop error 3, which was in yellow text. I have copied and pasted those errors bellow. If you want the entire log, please let me know:
Nov 2 23:36:09 miner local1.warn minergate[29509]: ASICS in loop 1: 3
Nov 2 23:36:09 miner local1.warn minergate[29509]: ASICS in loop 2: 3
Nov 2 23:36:09 miner local1.warn minergate[29509]: ASICS in loop> 3: 0
Nov 2 23:36:09 miner local1.warn minergate[29509]: ASICS in loop 4: 3
Nov 2 23:36:09 miner local1.warn minergate[29509]: ASICS in loop 5: 3
Nov 2 23:36:09 miner local1.warn minergate[29509]: ASICS in loop 6: 3
Nov 2 23:36:09 miner local1.warn minergate[29509]: ASICS in loop 7: 3
Nov 2 23:36:09 miner local1.warn minergate[29509]: ASICS in loop 8: 3
Nov 2 23:36:09 miner local1.warn minergate[29509]: ASICS in loop 9: 3
Nov 2 23:35:48 miner local1.warn minergate[29400]: Critical: ERROR: Loop failed 3 !
Nov 2 23:35:56 miner local1.warn minergate[29509]: Critical: Bad loop 3 = trying power cycle
Nov 2 23:36:09 miner local1.warn minergate[29509]: Critical: Bad loop 3 = set loop as disabled
As you can see, there seems to be an issue with loop 3. Whatever that means ? LOL. Any recommendations on how to fix if fixable would be greatly appreciated !!!
Many thanks !!!
macjax
When u re thermalled the chips did u clean the Asics up with isopropyl alcohol and scrape the hard shit from around the decoupling caps next to the Asics? When I rebuilt my SP20's the first one I did had this issue. I then re did the process but cut the glue from the PCB using a hacksaw blade so the heat sink went closer to the chip. You unfortunately need to use a shit load of paste (ignore anything you read on the internet). I put the heat sinks back on and tightened the clips, put a length of wood over the heat sinks and put a decent weight on there. I use epoxy and glued the heat sinks closer to the board and left over night. This fixed the issue with a hash card so I did the same on all of them. I know the SP30 is a bigger machine but I'm sure the guts are the same just different PCB layout. |
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...
Maybe, just maybe, the S9 hashes at a rate where the miner destroys itself over time but the new Avalon thunders on forever as the chips don't thrash their own bollox off, hence the lower efficiency.
...
It's the heat that burns down things. You're theory doesn't make sense. Better efficiency is not bad at all in the temp sense. Yes exactly! The S9 runs hard to get the high hash rate, high heat and high breakdowns. Maybe the new Avalon runs smoothly, less heat and less breakdowns. Something along those lines.......... |
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S7 pulls approximately 1.4KW so for a 240V setup (you definitely don't want 120V, too troublesome for high-current loads) you're looking at 6A per miner. Four miners will run fine off a 240V 30A circuit.
If you're wanting to divide that up, I'd recommend a pair of 20A circuits because that gives you room for expansion (20A can support 3 miners).
I recommend server PSUs. For the record, I sell server PSUs - I don't recommend them because I sell them, I sell them because they're generally a more reliable and cost-effective option than consumer ATX supplies. For one miner a good DPS1200 kit will work; if you want more juice, talk to Finksy or Optimizer for heavier-duty supplies that can run two or three miners together.
Going with a server supply kit usually means a bit more hands-on, but it's also a lot more modular so if something does go wrong it's cheaper and easier to maintain than replacing the entire thing like with a consumer PSU.
Bitmain also makes decent supplies; the 1600W APW3 is okay, but I have no experience with the newer bigger one they released a few months ago.
240V has a buttload of different outlets even for the same general power requirement. Depending on the PSU, you're looking at either a C13 or C19 end (both are very standard, very common). Make sure to use outlets for which you can find cables to fit the PSUs.
I'll second the Server PSU's. I run all my miners on DPS-1300 units all seconds from eBay about £15 each. I use two per miner on the S7's and S9's. One PSU to run 2 hash cards and one for the third card and the controller. I'm a qualified sparky and the power miners draw even got me worried. Now I have a purpose installed 63A 3-Phase supply with a mains board mounted directly on the rear of the miner rack. Each PSU is hard wired into a switch fused spur with a 10A fuse in each. I use two per miner one for each PSU. Each pair of spurs is wired in 4mm singles to a 10-Amp single pole breaker. One thing I learned in the first week was extension leads and UK plugs get hot and melt. The noise doesn't bother me as they all sit in my unit at work. The heat on the other hand........... It's ok at the moment as the weather is cold but the unit gets soooooo warm in the summer I worry like hell the rigs gonna melt. Lol. Remember getting six Spondoolies SP20's a while back and throwing them in the Server room at work I confess I didn't have a clue. Next day you could have baked bread in the Server room and it ruined the A/C and took our website down as the Supermicro rack Server decided enough was enough. One Dl360 made it but the office DL80 died of heat stroke. That day cost me a lot of money but hit home HARD the power of mining...... |
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So I don't confess to have ever seen an Avalon, but reading what you guys say about quality I guess these are the real deal.
Looking at the watt per hash rate, it seems lower than what Bitmain can achieve with the S9's.
Maybe, just maybe, the S9 hashes at a rate where the miner destroys itself over time but the new Avalon thunders on forever as the chips don't thrash their own bollox off, hence the lower efficiency.
I guess time will tell.
Just a though folk ...........
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Thanks. Ive found stock of the QFR1212GHE in the UK so Im going to order four of those, keep a few spare. |
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Wasn't sure if the S7 controller PCB can take the extra load drawn by the Delta fan. |
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