ANTMINER S7 is available at bitmaintech.com with 4.86TH/s, 0.25J/GH

[Mikestang]

Interesting and as always a pity that they do not tell us what they have changed....

Like Caanan said, all bitcoin related software should be 100% open source so everyone can see what is going on.

[1715054780]

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[yslyung]

OuCh ! Not mine, just sharing . . .

[JaredKaragen]

OuCh ! Not mine, just sharing . . .

what was his power supply?   and more importantly;  how overloaded was his power supply line to fry ALL of the boards like that.....

[suchmoon]

what was his power supply?   and more importantly;  how overloaded was his power supply line to fry ALL of the boards like that.....

It's not clear if the boards are fried... looks like the PCI-E connectors melted due to thermal runaway.

At least the warranty sticker is intact 

[HagssFIN]

yslyung: What was the PSU and the wire gauge?

[Mikestang]

Either he managed to unplug one of the 9 melted pci-e plugs, one of them didn't overheat, or he was only using 8 of them (note middle plug on top board).  All in all it's probably user error.

[HerbPean]

At least the warranty sticker is intact 

 

[elrippo]

At least the warranty sticker is intact 

 

You can use it for parts though 

[scyth3]

Solder the wires directly onto the board and continue mining.

[adaseb]

Its not a PSU fault, the miner probably overheated and melted some solder or a heatsink fell apart and shorted something out.

Each blade uses like 400 watts so using 2 pcie wouldn't of caused this.


Looks like they lowered the price to exactly 1 BTC after the coupons expired.


Price:       450 USD
               ( 1.005 BTC )

[JaredKaragen]

Its not a PSU fault, the miner probably overheated and melted some solder or a heatsink fell apart and shorted something out.

Each blade uses like 400 watts so using 2 pcie wouldn't of caused this.


Looks like they lowered the price to exactly 1 BTC after the coupons expired.


Price:       450 USD
               ( 1.005 BTC )

See;  now that's a reasonable price;  period.  I may order one even though I don't have the power supply to run it quite yet.  I already had to shut off all my scrypt miners and some of my S3's to lighten the load on my power connection.


As far as that miner above;  The only way to get that kind of thermal runaway is to either be undervolted on the supply line;  overdrawn on your supply line, insufficient power supply wattage, or not enough plugs from power supply to miner.    I am starting to think all 3.  Also;  They may draw 400W each;  but overclocking or running the machine close to 75+* is a beast to consider.

[klondike_bar]

Its not a PSU fault, the miner probably overheated and melted some solder or a heatsink fell apart and shorted something out.

Each blade uses like 400 watts so using 2 pcie wouldn't of caused this.

that stil would not explain all three failing - the shorted board would fail, but its unlikely all tree boards shorted at once and long enough to do this damage before killing the PSU
those look like garbage 18-20awg wires, but again - this should have failed on the board with two connectors long before the ones with three.

If i had to make a guess, i would say its related to the polarity, perhaps a custom wiring job gone wrong. Im not sure though if the S7 would force such a massive power draw though in that scenario?

even the connector on the controller burnt up. I dont think its a problem with the S7 - this looks like the result of a server PSU conversion where the wires were done wrong, and a GND or 12V wire was in the wrong pin, or shorted out in the breakout board/soldering

[JaredKaragen]

that stil would not explain all three failing - the shorted board would fail, but its unlikely all tree boards shorted at once and long enough to do this damage before killing the PSU
those look like garbage 18-20awg wires, but again - this should have failed on the board with two connectors long before the ones with three.

If i had to make a guess, i would say its related to the polarity, perhaps a custom wiring job gone wrong. Im not sure though if the S7 would force such a massive power draw though in that scenario?

even the connector on the controller burnt up. I dont think its a problem with the S7 - this looks like the result of a server PSU conversion where the wires were done wrong, and a GND or 12V wire was in the wrong pin, or shorted out in the breakout board/soldering

agreed.  user error IMHO.  Only time I get heating up plugs is insufficient power supply wattage, or low line input voltage due to an overloaded power line to the miner's supply.

I have had two coolmax 1600W power supplies fail on S7's.....

They are rated to put out 110A of 12V and 50A of 12V (12V#1, &2 as per the sticker on the power supply)

What they fail to mention is 12V#2 is only supplying the SATA plugs and the motherboard plugs.... so you are limited to 110A in reality.  And when you have all those PCIE plugs hooked to a board;  well;  I have two power distribution daugehter boards that have caught fire and half melted down.   I since have started lopping off the motherboard power plugs and attaching PCIE plugs to them to power a single hashing board.  This has balanced out the power draw in the supply and there has been no problem since...

So;  Its can easily be user error.

[elrippo]

Its not a PSU fault, the miner probably overheated and melted some solder or a heatsink fell apart and shorted something out.

Each blade uses like 400 watts so using 2 pcie wouldn't of caused this.


Looks like they lowered the price to exactly 1 BTC after the coupons expired.


Price:       450 USD
               ( 1.005 BTC )

Hard price for a used unit 

[elrippo]

that stil would not explain all three failing - the shorted board would fail, but its unlikely all tree boards shorted at once and long enough to do this damage before killing the PSU
those look like garbage 18-20awg wires, but again - this should have failed on the board with two connectors long before the ones with three.

If i had to make a guess, i would say its related to the polarity, perhaps a custom wiring job gone wrong. Im not sure though if the S7 would force such a massive power draw though in that scenario?

even the connector on the controller burnt up. I dont think its a problem with the S7 - this looks like the result of a server PSU conversion where the wires were done wrong, and a GND or 12V wire was in the wrong pin, or shorted out in the breakout board/soldering

agreed.  user error IMHO.  Only time I get heating up plugs is insufficient power supply wattage, or low line input voltage due to an overloaded power line to the miner's supply.

I have had two coolmax 1600W power supplies fail on S7's.....

They are rated to put out 110A of 12V and 50A of 12V (12V#1, &2 as per the sticker on the power supply)

What they fail to mention is 12V#2 is only supplying the SATA plugs and the motherboard plugs.... so you are limited to 110A in reality.  And when you have all those PCIE plugs hooked to a board;  well;  I have two power distribution daugehter boards that have caught fire and half melted down.   I since have started lopping off the motherboard power plugs and attaching PCIE plugs to them to power a single hashing board.  This has balanced out the power draw in the supply and there has been no problem since...

So;  Its can easily be user error.

I tend to use material provided by the manufacturer, becuase i suppose they know what they are doing and using, so i do not want to use some server- or desktop PSU's for this type of application 

[JaredKaragen]

Yeah;  It was safe to assume this power supply model was overrated, but it was literally underrated.

I have picked one up for myself at $100;  It had the same power distribution board fried.   I did some magic soldering work and was able to keep the power distribution and not have to solder the modular PCIE cables directly to the PSU...

Blockchainmines did a test; and the bitmain 240V ecu actually ends up sucking more wattage than a gold rated 1600w brand-name PSU...

[notlist3d]

that stil would not explain all three failing - the shorted board would fail, but its unlikely all tree boards shorted at once and long enough to do this damage before killing the PSU
those look like garbage 18-20awg wires, but again - this should have failed on the board with two connectors long before the ones with three.

If i had to make a guess, i would say its related to the polarity, perhaps a custom wiring job gone wrong. Im not sure though if the S7 would force such a massive power draw though in that scenario?

even the connector on the controller burnt up. I dont think its a problem with the S7 - this looks like the result of a server PSU conversion where the wires were done wrong, and a GND or 12V wire was in the wrong pin, or shorted out in the breakout board/soldering

agreed.  user error IMHO.  Only time I get heating up plugs is insufficient power supply wattage, or low line input voltage due to an overloaded power line to the miner's supply.

I have had two coolmax 1600W power supplies fail on S7's.....

They are rated to put out 110A of 12V and 50A of 12V (12V#1, &2 as per the sticker on the power supply)

What they fail to mention is 12V#2 is only supplying the SATA plugs and the motherboard plugs.... so you are limited to 110A in reality.  And when you have all those PCIE plugs hooked to a board;  well;  I have two power distribution daugehter boards that have caught fire and half melted down.   I since have started lopping off the motherboard power plugs and attaching PCIE plugs to them to power a single hashing board.  This has balanced out the power draw in the supply and there has been no problem since...

So;  Its can easily be user error.

I tend to use material provided by the manufacturer, becuase i suppose they know what they are doing and using, so i do not want to use some server- or desktop PSU's for this type of application 

I have had really good luck with this aswell.  Just buy a  APW3-12-1600 when purchasing a S7, and so far no problems.  You know by buying them the PSU was designed with the miner in mind.   Most likely that coolmax did not have a S7 in mind when designing it.

On S5 and older I did use high quality ATX PSU's.  But now I am using  APW3-12-1600 on S7's and then go into a PDU. 

[elrippo]

that stil would not explain all three failing - the shorted board would fail, but its unlikely all tree boards shorted at once and long enough to do this damage before killing the PSU
those look like garbage 18-20awg wires, but again - this should have failed on the board with two connectors long before the ones with three.

If i had to make a guess, i would say its related to the polarity, perhaps a custom wiring job gone wrong. Im not sure though if the S7 would force such a massive power draw though in that scenario?

even the connector on the controller burnt up. I dont think its a problem with the S7 - this looks like the result of a server PSU conversion where the wires were done wrong, and a GND or 12V wire was in the wrong pin, or shorted out in the breakout board/soldering

agreed.  user error IMHO.  Only time I get heating up plugs is insufficient power supply wattage, or low line input voltage due to an overloaded power line to the miner's supply.

I have had two coolmax 1600W power supplies fail on S7's.....

They are rated to put out 110A of 12V and 50A of 12V (12V#1, &2 as per the sticker on the power supply)

What they fail to mention is 12V#2 is only supplying the SATA plugs and the motherboard plugs.... so you are limited to 110A in reality.  And when you have all those PCIE plugs hooked to a board;  well;  I have two power distribution daugehter boards that have caught fire and half melted down.   I since have started lopping off the motherboard power plugs and attaching PCIE plugs to them to power a single hashing board.  This has balanced out the power draw in the supply and there has been no problem since...

So;  Its can easily be user error.

I tend to use material provided by the manufacturer, becuase i suppose they know what they are doing and using, so i do not want to use some server- or desktop PSU's for this type of application  

I have had really good luck with this aswell.  Just buy a  APW3-12-1600 when purchasing a S7, and so far no problems.  You know by buying them the PSU was designed with the miner in mind.   Most likely that coolmax did not have a S7 in mind when designing it.

On S5 and older I did use high quality ATX PSU's.  But now I am using  APW3-12-1600 on S7's and then go into a PDU.  

+1 AGREED --> me the same doing  

[kaltar]

I`m in the same boats as alot of you.  DOA board on one of my S7, they`ve received my board 3 weeks ago, and i still don`'t have shipping label for it. they tell me they found the board and did the repair on it, 2 weeks later i contact them again  and they tell me, no repairs are not done yet, it takes a few days. It`s BEEN 3 WEEKS for F... sake. and now i got another blade that died, it`s still under warranty but that one is going to Denver. even if if i got to pay for it.

i will NEVER NEVER buy from bitmain again. i bought 5 S7 and so far,
1 x DOA full S7. 150$ to send back and 1 month to get it back
1 x DOA board, 75$ and still in limbo
1 x board died, this one going to denver

not a very good tracking records and very poor RMA service. and all the ignores from them and run around.

[smaxz]

wow bum luck bro.. i just about did everything i could to kill mine and its going strong.

after a few hiccups for sure but nothing i could not work around.