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HP probook 4330s working silent fan mod!

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Hey all,

So I decided to post over here instead of at other notebook forums (in support of Nando4). nuff said.


probook 4330s

i7-2820qm hd 3000 graphics

16gb ram

wd scorpio black hdd

intel 520 ssd

I originally bought this machine for music production and wanted something fairly compact but upgradable to a quad core+16gb ram, dual hard drives, etc. This is the perfect machine, except for the loud fan. you can google and see what I mean. After months of searching and buying a new fan (did nothing), I stumbled upon this post and thought I should try it out. Short story is it worked and my laptop is super quiet :)

Background on the fan issue:

Normal operation: 1st fan level starts around 40C and fan about 3000rpm and stays like this for most of the operation where the fan pretty much never shuts off. Its almost impossible to work in a quiet environment aka studio or a library.


1. HPfancontrol (note: at that website, you need to scroll to bottom of page to get the hp version). this prog will allow you to adjust the fan steps based on temperature and works awesome for control over your fan but it cannot change the lowest rpm setting for your fan. This was a good temporary solution but I needed better.


I bought a bunch of diodes for about 2$ on ebay (model # 1N4001) and I put 2 of them on the orange/red wire on the fan. this reduced the first fan step from 3000rpm to about 2150rpm and its pretty darn quiet.

The effect of the 2 diodes is that it also reduced the top fan speed to 4237rpm (i didnt check what it was without the mod). During testing I also, accidentally found out that there are more fan control settings than those in the HpFancontrol.ini file. Pretty much any value between 0-128 changes the fan speed so I have been playing round to get the speeds that I want.

How to do the mod:

  • Take 2 of the diodes and solder them together. Make sure you note the polarity. Do not connect the stripe side of 1 to the stripe side of the other. it should be [blank-stripe]-[blank-stripe] NOT [stripe-blank]-[blank-stripe]. if you have a soldering iron, I would solder them together. Also tape or heatshrink the connection. Remember that if the wires touch anything inside your computer, its fried.

  • Unplug and take out the battery, flip it over and press the power button to release the charge.

  • Ground yourself by touching some metal.

  • Open up the bottom cover and remove the fan (see hp removal guides here)

  • NOTE: this step is optional, if you are careful, go to next step.....NOTE: BE CAREFUL NOT TO BREAK THE PLASTIC CONNECTOR. Carefully remove the RED/ORANGE wire from the connector housing (my wire looked orange but it could be red also). I used a small safety pin and pushed it into the connector until the wire released. The top of the connector has small slits in it and that is where you want to push the safety pin into. Push the pin in at the same direction the wire entered the connector. There is a small plastic flap that holds the wire in place, the goal is to lift the plastic clip so that the wire can come out. Do not break the small plastic flaps as these hold the wires in place!

  • Cut the red wire somewhere in the middle so that you have enough wire to work with. Connect the diodes where the stripe side is connected to the fan and the blank side connected to the small plastic clip (laptop side). Connection should be: plastic clip-[blank-stripe]-[blank-stripe]-fan (red wire). Again, solder and heatshrink making sure the polarity is right and all wires are protected.

  • Put the red wire back into the connector.

  • Reinstall fan.

  • Done

I tested with 1,2,3 diodes and wrote down the temps. I didnt discover that the HPfancontrol settings until I got 2,3 diodes connected, so I am missing some values there. The max temp spike I am seeing with 2 diodes is 83C while on top load (ableton live with 16 vst tracks & 5 audio tracks, 8 youtube tabs in firefox, media monkey, virus scan) where the average is about 77C. I tried doing the same test with 3 diodes, but my computer crashed, not because of temps but I think because of power draw, I pretty much hit 40Watts.

Anyhow the table below gives the HPfancontrol setting, and the corresponding rpm. Notice that by adding diodes, the highest settings lose granularity.

HPfancontrol setting


1 diode rpm

2 diode rpm

3 diode rpm01935225424572730300032763276327632763276327632763276

Good luck and happy modding.
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  • 8 months later...
  • 3 weeks later...

I made an attempt to lower rpms in 2570p. I soldered one N4004 diode, it was a little bit tricky because wire is a really short. It was hard to solder and make it separated from laptop. Maybe I will try tomorow solder one more diode. Even know it's a little bit hard to close bottom cover cause diode is placed on fan. There is no space left to solder two diodes in wire under fan, nearer mainboard.

Now we achieved 8460p/8470p rpms level but i'm little bit disappointed I didn't reach 2400rpms like friend above but even that laptop is significantly quieter than before mod.

255 = 0 -> 0

200 = 3072 -> 2700

128 = 3072 -> 2700

120 = 3072 -> 2700

110 = 3072 -> 2700

100 = 3034 -> 2700

90 = 3034 -> 2761

85 = 3034 -> 2891

80 = 3110 -> 3072

75 = 3276 -> 3276

70 = 3561 -> 3510

65 = 3780 -> 3840

60 = 4096 -> 4096

55 = 4551 -> 4468

50 = 4915 -> 4915

45 = 5461 -> 5585

40 = 6144 -> 5851

25 = 6642 -> 5851

0 = 6642 -> 5851

HWinfo after 1,5h using 2570p, on battery, power saving chrome x 7, foobar.


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