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tim-bc
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RIP
April 09, 2018, 02:16:48 PM
 #1

RIP Cry

https://i.stack.imgur.com/JyASP.jpg

Is the board useless now, or is there still some salvageable value?

Also, since it is melted to the chassis, would it be better to cut it from the top or from inside?

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April 09, 2018, 02:36:34 PM
 #2

Someone used a monster PSU and did not fuse the PCIe leads didn't they?...
As you've seen, those supplies make great DC arc welders which are more than happy to provide several hundred amps of current into a fault. To prevent this in the future, fuse each triplet of wires feeding each of the PCIe plugs with a 30A automotive fuse.

The board is toast and un-repairable.

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tim-bc
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April 09, 2018, 04:57:21 PM
 #3

Well, same setup as all the rest... I guess I should be grateful that only a few have melted. Good tip on the 30A fuses but it would be too much work to retrofit the miners. Perhaps the heatsinks could still be harvested.

Also, cutting the board out from the inside seems more logical. That way it can slide out first before the top part is removed.

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April 09, 2018, 05:27:08 PM
 #4

Can you not make adaptor cables with inline fuses like a mini extension? You could make singles so each cable was fused or a triple which would take three cables pass through a single fuse and back out to three cables?

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April 09, 2018, 06:23:24 PM
Merited by suchmoon (1)
 #5

Can you not make adaptor cables with inline fuses like a mini extension? You could make singles so each cable was fused or a triple which would take three cables pass through a single fuse and back out to three cables?
To prevent confusing the newbs/non-technical folks, please keep the terminology straight:
Wire = a single conductor
Cable or cord = a group of 2 or more wires that are ran together
The PCIe plugs use 3 wires in parallel for power and 3 in parallel for return aka triplets

Ja one could fuse each +12v power wire using 10A fuses or as you alluded to, use a single 30A fuse for each triplet.
Just cut the power wires (usually yellow) in the middle and tie together so you get:
power triplet from PSU > 30A fuse > power triplet to PCIe plug


Easy peasy and highly recommended when using multi kW PSU's to run multiple miners off of the 1 monster.

For bitcoin to succeed the community must police itself - Joshua Zipkin aka Joshua Alexander leaked AMT A1 miner skype chats
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tim-bc
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April 09, 2018, 08:02:21 PM
 #6

Easy peasy and highly recommended when using multi kW PSU's to run multiple miners off of the 1 monster.
Each miner is running off of a different PSU (1800W) at 220V, so I don't know if 30A fuses would help.

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April 10, 2018, 03:43:18 PM
 #7

You know...sometimes they just catch fire. It was a well known problem on 54 chip s7s.

Stop buying industrial miners, running them at home, and then complaining about the noise.
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April 11, 2018, 02:24:36 AM
 #8

The S9 is one rugged dude. It's amazing how it can catch on fire and still hash as if it's just been turned on for the first time.

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