ryangoan Posted December 6, 2012 Share Posted December 6, 2012 Hey all,So I decided to post over here instead of at other notebook forums (in support of Nando4). nuff said.specsprobook 4330si7-2820qm hd 3000 graphics16gb ramwd scorpio black hddintel 520 ssdI 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.Solution: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.This is where my mod comes in (NOTE: MOD AT YOUR OWN RSIK, I AM NOT RESPONSIBLE IF YOU FRY YOUR LAPTOP):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.DoneI 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 setting25512811010090827467656361594901 diode rpm02400xxx30003365xxxx4265475048002 diode rpm021372254248027303000336637233840390040964237423742373 diode rpm01935225424572730300032763276327632763276327632763276Good luck and happy modding. 4 Quote Link to comment Share on other sites More sharing options...
bjorm Posted August 15, 2013 Share Posted August 15, 2013 Great Great News! I'm going to aply this mod in 2560p/2570p and 8460p Are You able to asses if it's possible to swap 1N4001 with 1N4004? Quote Link to comment Share on other sites More sharing options...
bjorm Posted August 30, 2013 Share Posted August 30, 2013 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. 1 Quote Link to comment Share on other sites More sharing options...
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