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Why is my AntMiner S5 chain only intermittently operational? What could cause this, how could I diagnose it, and what is the solution? Will BitmainTech replace it for me? How do I know if it's under warranty? Is there a warranty?

AntMiner S5 dead chain

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Why is my AntMiner S5 chain only intermittently operational?

It's due to hardware failure.

Will BitmainTech replace it for me?

Yes, I had the same issue. I had to pay to ship it back to them, and they very promptly shipped back a replacement board.

How do I know if it's under warranty?

Ask them. They're able to figure it out for you.

Is there a warranty?

Yes, I believe it's 3 months (90 days).

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Someone suggested:

And first look through - https://bitmain.zendesk.com/hc/en-us/articles/204875015-How-to-diagnose-S5-hashing-PCB

Then if needed try - https://bitmain.zendesk.com/hc/en-us/articles/203559969-My-S5-hashes-at-about-600GH-S

Oddly, I unplugged the "Power Cable to Control" (with it still running), which cut the power to it, and plugged it back in. I also sprayed the Chain #2 board with some electrical contact cleaner, and that helped. Now the little red light on that board is on!

Update: But the it's no longer on now! ☹ It just shows: "------ -------- -------- -------- " in the "ASIC status".

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