Long-term investigation of unstable input

[MK92]

Do not waste 90$ for bullshit ferrite cores linked above, this will NOT fix your problems because the problem is low-frequency noise, not high frequency.

You would need something that would fix 10-40 khz noise, not ranges from 150+ khz to 10 mhz, but this doesn't exist at consumer level.

A lot of people are wondering what exactly is causing this problem. I’m one of them as well.

I’ve been assuming that the problem is somehow related to the power supply or electrical environment, but I still don’t know exactly which aspect of the power system could be responsible.

You mentioned that low-frequency noise might be the cause of the problem. Could you explain that in a little more detail? I’d be interested to hear more about what you mean and how you think it could cause this issue.

Basically, it is like that:

1) high-frequency noise a.k.a "emi" (harmonics caused by switching power supplies, power inverters, solar panels, LED drivers etc.)
2) low-frequency noise which is caused by voltage sag and fluctuation, high neutral impedance, neutral drift, reference point or potential issues etc., and also possible by grounding issues - it is better to not have a ground in your home then to have a broken, half-working grounding.

And a good PSU or ferrite chokes or whatever else you buy can only fix the first problem (high frequency), but low frequency noise cannot be fixed by anything at consumer level, only a full re-wiring or clean dedicated current could help.

[kimchi man]

Do not waste 90$ for bullshit ferrite cores linked above, this will NOT fix your problems because the problem is low-frequency noise, not high frequency.

You would need something that would fix 10-40 khz noise, not ranges from 150+ khz to 10 mhz, but this doesn't exist at consumer level.

A lot of people are wondering what exactly is causing this problem. I’m one of them as well.

I’ve been assuming that the problem is somehow related to the power supply or electrical environment, but I still don’t know exactly which aspect of the power system could be responsible.

You mentioned that low-frequency noise might be the cause of the problem. Could you explain that in a little more detail? I’d be interested to hear more about what you mean and how you think it could cause this issue.

Basically, it is like that:

1) high-frequency noise a.k.a "emi" (harmonics caused by switching power supplies, power inverters, solar panels, LED drivers etc.)
2) low-frequency noise which is caused by voltage sag and fluctuation, high neutral impedance, neutral drift, reference point or potential issues etc., and also possible by grounding issues - it is better to not have a ground in your home then to have a broken, half-working grounding.

And a good PSU or ferrite chokes or whatever else you buy can only fix the first problem (high frequency), but low frequency noise cannot be fixed by anything at consumer level, only a full re-wiring or clean dedicated current could help.

I understand what you mean when you say that low-frequency noise can occur for the reasons you mentioned and that it could be the cause of the problem.

If that’s the case, do you know whether the low-frequency noise is affecting the PC itself or the monitor, and do you know the mechanism by which it could be causing these effects?

I realize this is a difficult question, but it’s something I really wanted to ask you about.

[kimchi man]

Also, I heard that you solved the problem by repairing the neutral busbar in the electrical panel and installing a dedicated circuit.

When you say that you repaired the neutral busbar, do you mean that you replaced the entire busbar with a new one? Or did you simply tighten or re-secure a connection that had poor contact?

I’m also curious whether you left the existing wiring untouched and simply added one dedicated circuit, or whether you replaced the existing wiring as well.

Sorry for asking so many questions.

[unexpected8]

Kimchi man
My friend, no one knows the true cause of the problem. We know it is electrical, but it could be a weak ground connection, a loose or broken wire, EMI from household appliances or communication devices, an issue with the external utility line, or even environmental factors in your immediate area. If you research this—even going back quite some time—you will find that those who have faced this issue were unable to solve it. It is only in rare cases—such as moving to a different location or identifying a specific faulty wire—that a resolution is found; however, there is no universal, reliable solution for everyone. Simply put, a UPS provides clean power; if you were to run the device on UPS battery power for two to five minutes, you would find that the problem persists.
Even if you try a laptop and run it on battery power, you will find that the problem persists.