Topic: Antminer S19j pro + dropping Hashrate (Read 130 times)

To be completely honest very few texts except for ones at  bitmain certified centers have had their hands in the new + variants. If they are anything like the previous generation of s19 variants they are made with aluminum boards and have no mosfets. Meaning when one board throws an error the power supply is forced to turn off all three boards instead of just the one to protect the machine.

Your next step in diagnosing the issue would be to test the power rails using a multimeter when you see this issue occurring. With this info and more complete logs we likely can still help you.

I thought they did this because the heat sinks would just literally fall off while running sideways. With the heat sinks now spring loaded and clamped on I'm having difficulty figuring out why this is still done. I concluded is the old folly, " it's just how we've always done it". I've considered the convective benefits and see no appreciable difference, at least with such high pressure forced air. I suppose if you lay them horizontally you have to use more shelves which take up more space which don't let you put as many miners in one location which for obvious reasons will allow them all to perform better with the same cooling a denser configuration would in an identical pod. Although, I actually just learned that bitmain is going to attempt soldering heat sinks on again, this isn't one of those is it?

Are you running them flat like the S17? You should... with the bigger heatsinks pointing up.

Oh why is Bitmain repeating this mistake? These things should be used in immersion only...

You need to post the complete kernel log, these issues usually happen to temps related issues, could be the miner itself or the PSU, the second reason could be the voltage, overvoltage or undervoltage can cause hashrate fluctuation, pretty hard to tell whats wrong without more info.

I don't know exactly what your unit problem is but if you can paste the whole logs here maybe we can find the issue.
Just don't forget to put all logs inside the insert code tag it's a # button that you can find when editing a post.

Anyway, I have a few suggestions maybe the issue is high temp so make sure that your room is well-ventilated and make sure that you bring hot air out of the room.
Another suggestion try to upgrade the firmware to the latest version.

Hello, i just got a Antminer S19j pro +
and for most of the time it runs normal. But sometimes the Hashrate drops for 15-30min and all Hashboards are receiving thousands of HWs, after that the Miner just continues and no more HWs are happening.
This is what the Log shows:
2023-06-09 11:58:17 30m avg rate is 121857.63 in 28 mins
2023-06-09 12:03:54 Version num 64
2023-06-09 12:03:54 Mask num 0xe0e000
2023-06-09 12:03:54 opt_multi_version = 64, interval timeout = 2287
2023-06-09 12:03:54 freq = 660, percent = 90, hcn = 3971, timeout = 2287
2023-06-09 12:11:06 Version num 65536
2023-06-09 12:11:06 Mask num 0x1fffe000
2023-06-09 12:11:06 opt_multi_version = 65536, interval timeout = 2342708
2023-06-09 12:11:06 freq = 660, percent = 90, hcn = 3971, timeout = 2342708
2023-06-09 12:13:19 chain 0 hash rate 21835.00 low in 15 mins
2023-06-09 12:13:19 chain 1 hash rate 21336.00 low in 15 mins
2023-06-09 12:13:19 chain 2 hash rate 21491.00 low in 15 mins

Does anyone know how to fix it?

Best regards.