Re: Computer fan noise and maintenance
How can PC fans be maintained? (bearings, lubrication, cleaning off dust & particulates).
I have had long life with fans by using a fairly stiff paint brush to remove the dust on blades and body. Compressed air is useful but a dirt film often remains. I believe some use water to remove this film, there is an obvious need to ensure the bearings do not remain wet. For lubrication I use a synthetic oil 10-50 grade, it is thin and will not gum up or evaporate. Oil is applied by removing the circular sticker on the non moving side, gaining access to the bearing. About two small drops is the limit. I use a micro oiler with a hyperdermic needle diameter oiling tube.
How can PC fans be prevented from causing electrical interference?
What interference is the concern? Degraded computer performance or radiated radio interference?
Fans may generate pulses but in general these are removed in computers. Those connected to the motherboard and the power supply leads encounter filtering. eg fans creating noise on the twelve volt output of the power supply will not affect components down stream due to electrolytic cap filtering and possibly switching power sources down stream (that contain considerable filtering).
It would be nice to have examples of fan noise impact that has been eperienced and identified.
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Computer fan noise and maintenance
I thought I'd ask. Fan noise, degradation in increasing audiable levels through
their lifetimes aswell as the electrical disturbances they can cause. As an
electronics and engineering novice maybe someone could help me in a better
maintenance regime than my current one of hoping for the best.
So I have these questions:
How can PC fans be maintained? (bearings, lubrication, cleaning off dust & particulates)
How can PC fans be prevented from causing electrical interference?
The fans I use are double ball bearing & sleeve bearing. Connected to 12v
rail and onboard connectors.
Excerpt from an offsite link, link provided by willawake
Fan control output
The pulse width modulated output of the fan controller lacks noise suppresser, which should better be used if you use poor DC fan. Switching current to an inductive load generates sevier high voltage noise.
A snubber of 100nF to 1uF MLCC with 100Ω in series will be enough.
It added one snubber of MLCC of 1u/16V and 100Ω each between Vfan and GND pins of fan connectors.
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Hello guys. I have a problem with a PNY XLR8 GAMING RTX3090 graphics card. The problem is that it displays and works fine, but the fans don't spin at all. The problem occurred when someone else removed the fans in order to clean it and broke one of the fan connectors. He replaced it himself and after that, it wasn't working anymore. I guess he damaged something else in the process. What i have done so far: I found 2 capacitors next to the connector that were in a bad shape, he must have touched them with his tools - they weren't shorted, but i replaced them with similar ones from a similar card....04-12-2024, 06:54 AM -
Hello, This is my first post so please forgive me if I miss out some vital info.
I have a problem with my HP1955L monitor from 2005.
The first thing to say is that it is still basically working, ie the picture is fine.
However it makes an electrical buzzing sound. I know all monitors make some some of hum, but this is louder and more of a buzz.
The volume of the noise seems to be dependent on how hard the monitor is working; switched on with a blank screen -> no sound; small dialog (like OSD only) -> minor buzzing; full screen picture -> loud buzzing.
...11-07-2020, 07:13 AM -
Hi all,
I am working on a sound processor, it tends to overheat so I fitted a fan inside. The fan is connected to the +15V of the PSU via a DC-DC converter based on the LM2596 to reduce the voltage to around 10.5V.
Unfortunately the analogue circuitry is picking up the noise from the fan in two ways:
1. The fan is close to the analogue section, the motor itself gets into the outputs so I'll have to move it somewhere else
2. Even with the fan running outside of the case, there is still some noise which is clearly going back to the processor via power line.... -
Surprisingly enough, this receiver doesn't have the DSP chip issue. The HDMI board does not get hot, and sound over HDMI works fine.
Regardless of the input, the right channel has noise that is clearly noticeable even on average volume level. The only cases when there's no noise is when VCR input is selected (some tracks on the board are damaged, maybe that's why), or if HDMI input is selected but nothing plugged into it. In all other cases, even when no input is connected I still have the noise.
There's some logic behind it. As soon as I select an input I get only left...04-23-2025, 10:09 PM -
i recapped the entire foxlink psu with rubycon caps of the exact uf needed. i also purchased a delta psu to see if the different brand would change anything and it did not. i recapped the entire motherboard except for about 5 of the 22uf caps. i used rubycon on everything except the five in front of the processors. i used 5 nichicon polymer caps there. i soldered a wire to each screw hole of the psu and soldered one wire to the metal outer shell and one to a screw hole on the motherboard(to make sure it was all grounded well). i also recently tried disconnecting the power cables from the dvd drive...
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