Hello Ohjrson,
I am unsure if it is the same with the type of fan you are using, but with noisy PSU fans I have done this for several machines in the past -
1/ unplug from mains electricity supply
2/ undo the cover screws and remove the PSU, then undo the PSU screws and remove the fan.
3/ in the centre of the fan is a foil sticker, peel this off, and save for later.
4/ in the centre where the sticker was is a flush cover/bung, open this using a needle or fine
screwdriver, this reveals a well.
5/ drip into the well 2-3 small droplets of white/clear machine oil, as used for sewing machines.
(I used a small bottle with needle tip, if the bottle has a larger opening you will need less drops) (ohjrson Made own oil from mix of motor oil and vaseline about 60/40)
6/ turn the fan blades a few times in each direction, leave to soak a short while. (I placed a
cleaned diet pepsi bottle cap over the well, on the outside, whilst it is soaking so no dust
attracts to the oil)
7/ replace the central cover/ rubber bung into the well, wipe any excess off and replace sticker. If
needed apply removable gum to affix it, so it can be removed at a future time.
8/ reassemble and fan was then silently running.
Note - prior to the above I will use an Air duster to remove loose dust, then I use a computer swaps, it is like cotton buds but lint free cloth instead of cotton wool and had wider handles, onto this I spray Digital Cleaning Spray, the blue one, Actually they give you 100 swaps in the pack with the digital cleaning spray, but you can buy extra ones, I then wipe off the blades of the fan and around insides of fan outlet at bother ends in psu, collect out any dust inside the psu unit so it is very clean. Then clean up the mess on desk and begin the fan lubricating process described above.
Additonal info , the fans on psu make the noise because the oil/lubricant dries up or contains matter it didn't to begin with, and also dust on blades unbalances the fan, so it causes wear, many fans that are changed due to being noisy just need to have lubricant added, using above method.
The sooner lubricant is added when noise begins the less wear will occur as the fan is not running "dry" etc.
I went and actually performed a cleaning and re-lube of sorts (did not totally disassemble the fan assembly as I could not figure out how the fan blade was being held on. It had some sort of brass plug topped with plastic in the normal location mentioned in the video link shengchieh provided.) just like what is mentioned here. So far it has been silently running since.
What I did was slightly different then what is shown in the video. Because my fan was on the laptop. Once I had the fan out, I actually peeled the other side of the fan cover off. (this is the side that you can see when the access cover over the fan is taken off, sorta looks like part of the rotor really.) Once that was peeled back I saw three small holes, I added the mix of oil I created from the video and spun the fan. Then put everything back together. It has been quiet ever since. (Knock on wood)
:o Praying that fixes it for a while. 8) ;D
Thanks for the info. It has helped...
ohjrson