Quote from: fromport on March 18, 2025, 03:26:48 PM

I have experienced the same.
And it is mostly 1 of the VR's that stops working but not always the same. eg VR1 stops, VR2&3 keep working. [powercycle] all 3 working, and after a while VR 1&2 working, VR3 no longer produces output power.

I wish someone would include syslog client into bitaxeos so all logfiles could be collected on a syslog server in a LAN so we could see the log files that triggered the event.
That would tell us a lot more probably

Quote from: iambonkerz on March 19, 2025, 02:22:55 AM

Hmm, I’ve had a similar experience before, after I replaced the thermal paste and may have over-tightened the heatsink screws. Loosening them seemed to fix the issue. If you have swapped the thermal paste, you might want to try loosening the screws.

Yes, well after quite a bit of experimentation, it does appear to be an issue with one of the TPS546 regulators as fromport has suggested.
What's interesting though is it does not occur with the original Minerfixes firmware of v1.0.0!

This table shows the minimum settings I could use for a 3TH/s low power usage with firmware v1.0.0:
Notice the iout for the middle regulator.

Code:

Freq: 375
Voltage: 1.085
Watts: 62.3
--------------
₿ (2659126) power_management: 7F vout: 1.08, iout: 14.47
₿ (2659126) power_management: 24 vout: 1.07, iout: 12.45
₿ (2659126) power_management: 14 vout: 1.08, iout: 14.06
₿ (2659136) EMC2302: GET-Fan Speed[0] 989 = 1987 RPM, MSB 0x1E
₿ (2659136) power_management: Board Temp: 40, 44
₿ (2659146) power_management: TMP546_0 Temp: 45
₿ (2659146) power_management: TMP546_1 Temp: 45
₿ (2659156) power_management: TMP546_2 Temp: 44

Unfortunately using the TCH 2.5.1 firmware this particular LV08 only has 2 of the 3 TPS546 regulators working if it operates below a certain threshold.

And once the problem has occurred, the only way to resolve it (it's not permanent though), is to unplug the LV08 (cold boot if you will) and restart it. But before doing that, the LV08 has to be set to no lower than 425 MHz and a high enough voltage so that all 9 ASIC chips are mining smoothly (around 1.125 to 1.150 volts).

At 425 MHz and 1.150 volts, the LV08 is mining at 3.5 TH/s showing about 79 watts on the dashboard. If I drop the voltage down to 1.125, the hashing rate appears to be stable and the power level drops 4 to 5 watts. But if I drop the the frequency down to 400 MHz, the power level shoots up about 15 watts and even though the middle TSP546 has increased to about 22 amps (from about 15 amps), only 6 out of the 9 ASIC chips are now mining!

The LV08 stays at this higher output level with only 6/9 chips working. But usually within a minute or two, the voltage on the dashboard drops to zero when the middle TPS546 regulator shuts down also bringing down the power usage by a third to about 52 watts.

I'm not sure if it's a parameter than needs to be modified on the TSP546 regulators as I said above, as it does not happen with the original factory firmware. Later this evening I will disassemble the unit so I can apply a better quality thermal paste and check the tightness of the heatsink mounting screws as iambonkerz has suggested...