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New methods to reduce the fan noise in a T60 or in a T60p

T60/T61 Series
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RealBlackStuff
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Re: New methods to reduce the fan noise in a T60 or in a T60p

#31 Post by RealBlackStuff » Thu Jul 05, 2012 5:05 am

@Dozer:
If your T60 (with T61 mobo) is stationary, i.e. not carried around all the time, you can use the modem of the T61 mobo by cutting out a larger piece of the T60 chassis around the modem.
And there is an alternative!
Forum user Peak2Peak put a very similar R61 mobo in a 15" T60, well documented and illustrated, and was able to keep the modem.
http://forum.thinkpads.com/viewtopic.ph ... 26&start=0
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Re: New methods to reduce the fan noise in a T60 or in a T60p

#32 Post by dozer » Thu Jul 05, 2012 5:28 am

RBS, howdy ho ! :D

I didn't know of P2P's success with a modem....thanks for that!

and for the thread-link as well...loading that now...

hmm....with Peak solving the modem-issue, perhaps it's time to see if I can find someone to put a Frank together for me...

Not sure I can afford it...but it's certainly worth finding out what the cost would be.

Does Tuus do that? I don't recall seeing his name last time I was hanging out here...a year ago I suppose...but in the 'catching up' I've been doing tonight, he and his work seem to be well regarded...

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Re: New methods to reduce the fan noise in a T60 or in a T60p

#33 Post by iwishiwasinwhistler » Mon Jul 09, 2012 5:25 am

@dozer, the fan and heatsink does all fit perfectly in my Frankenpad (NB: have a look at my original post regarding proximity to the board and some from of insulation). It doesn't push against the keyboard at all. I have a T60p chassis, with an intel 965 intergrated 47w7872 planar which I pulled out of a working 14" T61, and the discrete fan from a T500 (45N4592).

What you may have missed is that bmwman and I were discussing the possibility of using the 45N4592 on a T60p planar with discrete FireGL 5200. I haven't done this. However, I do have a spare one of these boards and after looking at it, and the feedback in the German thread, reckon it's a no go without further modification. Bmwman may be trying this after he's finished his engine swap on his car.........

As an aside, I put an intel X9000 cpu in my Frankenpad a few days ago and I haven't noticed any real difference in temps. It's working well. The fan still doesn't come on when mobile doing basic stuff. When docked with lots of monitors it's made a big difference. I've got a stable overclock at 3.6Ghz, everything's super snappy and the fan takes it all in it's stride without high temps or lots of noise. Very happy.

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Re: New methods to reduce the fan noise in a T60 or in a T60p

#34 Post by bmwman91 » Mon Jul 09, 2012 10:36 am

I received my T500 discrete HSF assembly, and I am now back home from my business trip. It is definitely a beefier unit than the T60p one!

I can see why it might be possible that the '92 HSF would hit the keyboard since there is a big aluminum part covering the heat pipe over the GPU area. I have preemptively bent the heat pipe to make the GPU portion sit lower and be co-planar with the CPU section. This may or may not be tested out on the T60p motherboard though...I just purchased a T61p motherboard with the NVS140M GPU from TuuS (fully tested, hopefully will serve me for many years). If time (and my patience) permit, I will test fir it on my V5200 T60p mobo first to give people some feedback.

Overall, I don't see anything on there that some careful filing can't help. I may also look into carefully inserting the HSF into a vise and flattening the heat pipes (where needed) rather than filing them. Both methods have their advantages and disadvantages. Hopefully I won't have to do either, though.

Bending the heat pipe for the '92 fan to get the GPU portion to sit lower was super easy. It has been years since I did it to the T60p HSF, but it didn't seem much, if any, harder. Then again I work on my car a lot and rock climb, so maybe I am less sensitive to it.
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Re: New methods to reduce the fan noise in a T60 or in a T60p

#35 Post by Peak2Peak » Mon Jul 09, 2012 3:23 pm

bmwman91 - If you do find time to try the '92 HSF on your V5200 T60p, please post some pic's if poss - I am interested with regards to the fitment of the T60's HSF bracket clamp (P/N 26R9633), if it sits as per the the T60p's HSF (41V9932) due to the aluminum plate covering the GPU area.

Not so long ago i did try out a T61 4:3 HSF - FRU: 42W2820, which also has an aluminum plate above the GPU area with the T60p's HSF bracket clamp and found the bracket did not sit as per the the T60p's HSF (41V9932), it was elevated approx 2mm when compared to the fitment of the T60p's HSF (41V9932) - This caused the keyboard to flex above the GPU area. However was amazed at how quickly the CPU & GPU temps dropped when the fan was in operation!
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Re: New methods to reduce the fan noise in a T60 or in a T60p

#36 Post by bmwman91 » Fri Jul 13, 2012 5:27 pm

OK, I have done some experimenting with the 45N4592 (T500 w/ discrete GPU) HSF on the T60p with V5200 GPU. I also tried it with a T61p Frankenpad with NVS 140M GPU. In both cases, the fit is poor and it causes significant distortion in the keyboard. The V5200 GPU is ~1.5mm taller than the NVS 140M GPU, but neither one allows the 45N4592 HSF to fit well.

I opted to take the fan assembly out of the T500 heat sink and install it into a T61p discrete heat sink (42W2028). The GPU portion of that heat sink also has the aluminum block on it, like the T500 one, but it is about 0.75mm thinner than the one on the T500. So, I get an improved heat sink with an even more improved fan. Well, I think I do anyway. Reading around on here and the German TP forum indicated that the T500 HSF used an improved fan blade design ("owl blade"). Is that in fact correct?

I have created my own thread for my Frankenpad conversion and it mostly focuses on the details of the heat sink. That seemed prudent since adding tons of pictures to a thread that didn't mention that in the title seemed like a way to have them all turn into URLs! See here:
http://forum.thinkpads.com/viewtopic.php?f=29&t=105114
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Odp: New methods to reduce the fan noise in a T60 or in a T6

#37 Post by thorcik » Sat Jul 14, 2012 1:19 am

If we're talking about HSFs - has anyone compared the t500 integrated with a t61 unit? My fan seems to be dying and, as I have to replace it anyway, I would't mind some extra cooling performance. I might just swap the fans but I'm lazy :P
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Re: New methods to reduce the fan noise in a T60 or in a T60p

#38 Post by Backslashnl1 » Sat Jul 14, 2012 8:02 am

Yesterday I installed the 45N4592 heatsink in my T61 FrankenPad. It is allmost a straight swap in, you indeed only need to remove 3 small fins on the top.

However, after boot up I noticed some keys of my keyboard not working.
It were some keys in the middle, the T, Y, G, etc. I figured I didnt install the connector firmly. So I reopened the laptop, reattached the keyboard connector and booted the T61. However, after the keyboard reinstall even more keys where disfunctional. Now half of the keyboard doesn't work :?

I connected the keyboard of my wifes T60 without complete reinstall of the palm rest (only the keyboard connector attatched) and it worked fine. I installed my keyboard in her T60 and the keys where still disfunctional. It looks like my keyboard disortion is permanent :(

bmwman, you mentioned you experienced significant distortion in the keyboard. Did the disortion go away after installation of the T61 heatsink?
I am also hesitant that a new keyboard will get disfunctional :oops:

thorcik, I compared the noise of this T500 fan with my previous T61 integrated fan. So far the fan hasnt spinned for the first 30-40 minutes :) It turned on for maybe 3 minutes and now it is off again. The T61 fan did go on much often and longer. Temperatures however are the same.
I made a sound record of both the T61 and T500 fan, both running on full speed. I will upload them both so you can compare the sound.

edit:
T61 fan sound record
T500 fan sound record
You should turn up the volume to hear it well. In both cases the fan is spinning at max speed ~2900 rpm. I prefer the sound of the T500 fan, which is in my opinion less annoying :)
T61 FrankenPad | 15.0" IPS UXGA flexview + LED | C2D T9500 @ 2,6 Ghz | T500 fan / T61 heatsink | 8GB Micron dual channel | Samsung 840 Pro 256GB SSD | nVidia Quadro NVS 140M | NNB Keyboard | BroadCom 802.11AC 867Mbps + BT 4.0 | OS-X 10.9.1 Mavericks + Win7

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Re: New methods to reduce the fan noise in a T60 or in a T60p

#39 Post by bmwman91 » Sat Jul 14, 2012 9:21 am

Nice, the T500 fan does seem to be a bit better in terms of frequency content. Thanks for taking the time to record the fans.

Yes, when I installed the '92 T500 fan, the keyboard was visibly distorted because of the aluminum block and spring plate over the GPU. It was bad with both the T60p motherboard and the T61p motherboard (both with discrete graphics). From what I can tell in this thread, the '92 heat sink will only fit well on motherboards that have the Intel integrated GPU.

With the T61p heat sink, there is still a tiny amount of contact with the keyboard and the distortion is almost not noticeable unless you hold a ruler over the keyboard. The T500 fan can easily be swapped into the T61p heat sink though, so you can still have the optimum setup: great cooling with better noise.
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Re: New methods to reduce the fan noise in a T60 or in a T60p

#40 Post by Backslashnl1 » Sat Jul 14, 2012 9:39 am

bmwman91 wrote:Thanks for taking the time to record the fans.
No problem, I was curious about the noise too :)
Yes, when I installed the '92 T500 fan, the keyboard was visibly distorted because of the aluminum block and spring plate over the GPU. It was bad with both the T60p motherboard and the T61p motherboard (both with discrete graphics).
What do you mean with "distortion"? You mean the keyboard is rised? Or keys dysfunction? That is I have..
From what I can tell in this thread, the '92 heat sink will only fit well on motherboards that have the Intel integrated GPU.
Well, I have a motherboard with Intel integrated GPU :?
With the T61p heat sink, there is still a tiny amount of contact with the keyboard and the distortion is almost not noticeable unless you hold a ruler over the keyboard.
I don't completely understand what you are saying here.. Do you mean the 'distortion' is not always noticeable? In my case the keys dysfunction isn't temporarily, it is permanent :oops:
T61 FrankenPad | 15.0" IPS UXGA flexview + LED | C2D T9500 @ 2,6 Ghz | T500 fan / T61 heatsink | 8GB Micron dual channel | Samsung 840 Pro 256GB SSD | nVidia Quadro NVS 140M | NNB Keyboard | BroadCom 802.11AC 867Mbps + BT 4.0 | OS-X 10.9.1 Mavericks + Win7

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Re: New methods to reduce the fan noise in a T60 or in a T60p

#41 Post by bmwman91 » Sat Jul 14, 2012 9:48 am

Sorry, let me clarify.

With the T500 heat sink in the T60p chassis, it hits the keyboard and makes a bulge or "hill" once everything is fully assembled. The keyboard cannot sit flat with the T500 heat sink under it. There is no permanent damage to the keyboard as far as I can tell. I observed this on both T60p and T61p motherboards with dedicated GPUs. Others in this thread seem to have indicated that this is not a problem with integrated Intel GPUs since they are smaller, but I cannot confirm this since I do not have a laptop with Intel graphics.

The T61p heat sink fits much better. it still hits the keyboard a little, but with it under the keyboard there is very little bulging when everything is fully assembled. I made a change to my setup just now and removed the little thermal pad that I had placed on top of the spring bracket, and there is only the slightest bulge in the keyboard now. It cannot be detected by looking at it unless you hold a ruler over the keyboard. Again, this is only when everything is fully assembled and no permanent bending is present in the keyboard if I remove it.
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Re: New methods to reduce the fan noise in a T60 or in a T60p

#42 Post by Backslashnl1 » Sat Jul 14, 2012 10:03 am

bmwman91 wrote:Sorry, let me clarify.

With the T500 heat sink in the T60p chassis, it hits the keyboard and makes a bulge or "hill" once everything is fully assembled. The keyboard cannot sit flat with the T500 heat sink under it. There is no permanent damage to the keyboard as far as I can tell. I observed this on both T60p and T61p motherboards with dedicated GPUs. Others in this thread seem to have indicated that this is not a problem with integrated Intel GPUs since they are smaller, but I cannot confirm this since I do not have a laptop with Intel graphics.
Thanks, now I understand what you mean. I have a T60p chassis with T61 motherboard with Intel integrated GPU and I can confirm I have no bulge/hill once the keyboard is assembled. My problem is that half of the keyboard keys stopped working after the T500 fan installation.

I guess I have to order a new keyboard and hope all keys will work... Perhaps I will put some heat-resistant tape under my new keyboard as a precaution.
T61 FrankenPad | 15.0" IPS UXGA flexview + LED | C2D T9500 @ 2,6 Ghz | T500 fan / T61 heatsink | 8GB Micron dual channel | Samsung 840 Pro 256GB SSD | nVidia Quadro NVS 140M | NNB Keyboard | BroadCom 802.11AC 867Mbps + BT 4.0 | OS-X 10.9.1 Mavericks + Win7

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Re: New methods to reduce the fan noise in a T60 or in a T60p

#43 Post by BKthink » Sat Jul 14, 2012 2:37 pm

OT, but bmwman91...how's that e30 coming?

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Re: New methods to reduce the fan noise in a T60 or in a T60p

#44 Post by bmwman91 » Sat Jul 14, 2012 7:44 pm

Hey BK,

The E30 is going OK. There's a fully built motor on its way and I'll be installing it soon. The car hasn't run in almost 3 months thanks to the timing chain deciding to break loose about 160 miles from home near the end of a 1000 mile drive! It will be nice to have a brand new, hand built motor in there that I know I can depend on. Are you an E30 fan / member on an E30 board?
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Re: New methods to reduce the fan noise in a T60 or in a T60p

#45 Post by BKthink » Sat Jul 14, 2012 7:57 pm

bmwman91 wrote:Hey BK,

The E30 is going OK. There's a fully built motor on its way and I'll be installing it soon. The car hasn't run in almost 3 months thanks to the timing chain deciding to break loose about 160 miles from home near the end of a 1000 mile drive! It will be nice to have a brand new, hand built motor in there that I know I can depend on. Are you an E30 fan / member on an E30 board?
Had an E30 some years ago and loved it! My main passion is the E24. I still happen to have the E30 Bentley manual if you want to borrow it. Good luck with the install and break-in. Looks like true gear-heads like to tweak their computers AND their vehicles...

BK
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Odp: New methods to reduce the fan noise in a T60 or in a T6

#46 Post by thorcik » Sun Jul 15, 2012 12:59 am

To bring the topic back on track - I think I'll order the t500 Intel HSF, in worst case I'll tinker with the fan ;)
Luckily I have a spare KB :D
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Re: New methods to reduce the fan noise in a T60 or in a T60p

#47 Post by Otto » Wed Nov 07, 2012 5:05 am

I've a T60p (2007-CTO) with the V5200 graphics chip, and I'm looking for a way to run it cooler and more silent. The previous owner of my laptop has made the heatsink mod (involving thermal glue and a coin) explained on this forum. I however am not very pleased with it and I really have to do something about this...

After reading this thread I suppose my options are either a T61p or T500 heatsink assembly. And as far as I understood both of those have their cons. T61p HSF not being dramatically much better than a T60p HSF, and the T500 HSF sitting on a V5200 causing the keyboard slightly to bulge.

If I found a T60 motherboard with intel graphics and swapped the motherboard to my system, would I still be able to use the SXGA+ display my unit has? I don't mind the lesser performance because I don't do graphics intensive stuff. But from what I've understood the CPU generated heat isn't much of an problem in these T6x's.

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Re: New methods to reduce the fan noise in a T60 or in a T60p

#48 Post by RealBlackStuff » Wed Nov 07, 2012 7:19 am

All T60/T61 motherboards can support XGA/SXGA+/UXGA and their widescreen varieties.
If you want to change the mobo, why not put one in from a 14.1" 4:3 T61 with Intel graphics?
You can then add up to 8GB RAM if you run a 64-bit OS.
And your HD/SSD can run at SATA II speed after applying the Middleton BIOS, which also removes any 'whitelists'.
You'd only loose the modem during the conversion.
Read up on Frankenpads in this forum...
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Re: New methods to reduce the fan noise in a T60 or in a T60p

#49 Post by TuuS » Wed Nov 07, 2012 4:47 pm

I'll second what RBS said. I'd never consider downgrading from v5200 to a T60/intel board. If your only problem is with heat then I think you're underestimating the difference the t61p heatsink will make, When properly installed they run much cooler then the t60/t60p heatsink, but if you don't need/want discrete graphics, then a T61/intel board would be ideal for your needs.

The only thing you'll lose when going with the t61 board is the internal modem, but most of us never use them and if you really must have one, you can get a pcmcia modem very cheap.

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Re: New methods to reduce the fan noise in a T60 or in a T60p

#50 Post by Otto » Fri Nov 09, 2012 7:58 am

Maybe I should try the T61p heatsink with my current motherboard. If it's not silent enough for me I'd still need it if I changed the whole motherboard to something with lower performance graphics. The 64 bit capability is quite irrelevant for me. I'd still be using the 32bit XP on the COA-sticker.

Is 42W2822 or 42W2028 the correct FRU I should be searching for? Or does someone have a good source (eg. an eBay seller) of those in mind?

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Re: New methods to reduce the fan noise in a T60 or in a T60p

#51 Post by Mike__P » Mon Dec 17, 2012 11:29 am

Otto wrote: Is 42W2822 or 42W2028 the correct FRU I should be searching for? Or does someone have a good source (eg. an eBay seller) of those in mind?
I also would like to know what is the proper part for a t60p w/v5250 fan replacement? This laptop sits in a dock 24/7 and is always noisy!

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Re: New methods to reduce the fan noise in a T60 or in a T60p

#52 Post by lab » Tue Jan 01, 2013 4:08 pm

Hacking the bios for custom fan speeds seems to work on the T60p as well. Following the eminent instructions in a post earlier in this thread the fan of my "new" T60p now runs almost inaudibly on 2000rpm, well below the noise from the hard drive.
And a positive thing is that the temperature rise is very moderate, only about 2-4 degrees Celsius compared to when the fan was running at factory setting speed of plus 3000 rpm. After several hours of light use the reading for the CPU is 52 °C and for the GPU 64 °C and fan at approx. 2000 rpm manually set using TPFanControl.

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Re: New methods to reduce the fan noise in a T60 or in a T60p

#53 Post by Morten » Tue Jan 08, 2013 5:01 pm

Can any of you guys who modded the EC code post up the modded file?

I'd love for mine to idle at 2000 RMP instead of cycling between 0 and 3000 (with my TPFANcontrol config).

I've got a T60 MB with a dead NIC I'm willing to experiment with. Promise not to blame anyone if it turns into a brick :lol:

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Re: New methods to reduce the fan noise in a T60 or in a T60p

#54 Post by lab » Sat Feb 02, 2013 9:32 am

Not completely happy with the heat from ATI graphics I decided to replace the motherboard in my T60p with one that has Intel integrated graphics (on ebay only ~$20 plus shipping). I had expected a power consumption of something like 10W att idle, similar to my T400, but it turned out to be as high as 15W, only 3W lower than the tweaked ATI 5200.

Very well, after undervolting the CPU the temperatures has gone down a bit and I guess a temperature of 45 degrees Celcius at low load (internet browsing, watching movies) is acceptable.


I have tested some different rpm tables both on the ATI 5200 system and on the Intel board and all has been flashed to the bios not causing any problems.

The current setting is 2100-2400-3000rpm:

1056 2100 2400 3000 32767
1056 2100 2400 3000 32767
1056 2100 2400 3000 32767
1056 2100 2400 3000 32767
1056 2100 2400 3000 32767
1056 2100 2400 3000 32767
1056 2100 2400 3000 32767
1056 2100 2400 3000 32767
1056 2100 2400 3000 32767
1056 3000 3500 4400 32767
1056 3000 3450 3800 32767
1056 3000 3450 3800 32767

As the table show I left the last three lines unaltered, since my guess is that each line represents a different configuration and the three last lines are the highest factory settings and thus unlikely to be used for an Intel graphics system. So far my guess seems to hold.


For those non hackers (like myself) interested in making the same modifications to bios EC, a simplified version of the steps posted before are:

1. Download the latest version of the bios utility for T60/T60p from Lenovo, unpack and load the $01A3000.FL2 or $01AC000.FL2 (identical) in a hex editor capable of displaying both hex and decimal.

2. Implement the LRC, e.g. in Matlab, and test the algorithm on all three check blocks to make sure you get the check value of 0.

2. Find the rpm table at the location given in previous post and alter the settings as you find suitable (keep an eye on the temp readings afterwards to make sure cooling is sufficient).

4. Calculate the LRC for block [011000, 030000), replace the check word in 0x02fffe and then re-calculate to make sure its correct and sums to 0.

5. Save in flash folder and update bios with "winuptp.exe /s" run from the same folder. Since silent mode, wait a couple of extra minutes after the process has finished to make sure the update is completed before rebooting.


NO WARRANTY OF SUCCESS, FOLLOW THESE INTRUCTIONS AT YOUR OWN RISK.

Edit. The power consumption has now droped to 12.5W at idle after installaing some missing drivers for wireless network(I think!).

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Re: New methods to reduce the fan noise in a T60 or in a T60p

#55 Post by Johan » Sat Feb 02, 2013 12:36 pm

lab wrote:... after undervolting the CPU the temperatures has gone down a bit and I guess a temperature of 45 degrees Celcius at low load (internet browsing, watching movies) is acceptable.
Would you be kind to elaborate (in detail, please!) exactly how you have managed to "undervolt" a Core Duo CPU? I would guess that you are perhaps using the RMClock Utility but if so then - as far as I recall - there's not much to benefit, because it is not RMClock that limits the lowest VID (requested core level voltage), but the CPU itself, and there's NO way around this, so for the lowest multiplier, then what do you benefit??

Thanks in advance for sharing...! :bow:

Johan
IBM T42p's (2373-Q1U & -Q2U): 2.1 GHz, 15" UXGA FlexView, 2 GB RAM, 128 MB FireGL T2, 128 GB 1.8" SATA SSD, IBM a/b/g, BT, Win 7 Ultimate
IBM T42 (2373-N1G): 1.8 GHz, 15" SXGA+ FlexView, 2 GB RAM, 64 MB Radeon 9600, 64 GB 1.8" SATA SSD, IBM a/b/g, BT, Win 7 Ultimate

lab
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Re: New methods to reduce the fan noise in a T60 or in a T60p

#56 Post by lab » Sat Feb 02, 2013 1:43 pm

For some reason core voltage by default remains at 1.262V for all CPU speeds. Using RMClock I set the voltage to 0.95V (lowest possible VID) for 6x-10x and 0.975V to 1.02V for multipliers 11x-13x.

Perhaps the same can be acchived by altering some settings in bios or XP?

wonz
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Re: New methods to reduce the fan noise in a T60 or in a T60p

#57 Post by wonz » Sat Feb 02, 2013 2:51 pm

hello

... my V5200 runs now very hot too and i find online new thermopad wich has 14.0 [W/mK] and i want to aplay it but i dont know what the tickness should be 0,5mmm 1mmm or maybe more ... enyone can help ?
IBM T60p 2007-FE2 @ SXGA+ IPS FV (new CCFL) @ T7200 @ T61p HS + T500 fan @ 32Gb SSD @ 100Gb UB @ Advanced-N 6200 @ BT 3.0
condition: 6 years on the frontline :D ... but i`m not ready to let go ...

x200 tablet @ 64Gb SSD @ BT 4.0

PAST: T61 7661-BM5 @ T9300

lab
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Location: Malmö, Sweden

Re: New methods to reduce the fan noise in a T60 or in a T60p

#58 Post by lab » Tue Feb 05, 2013 3:13 am

I discovered XP's power management and did some simple tests. For a total CPU load of 50% I got a drop of approx. 15 degrees Celsius when using my RMClock settings above compared to the lowest power settings in XP (max battery life etc.). At idle there was however no difference in CPU temps when XP power managment was set to max battery life.

lab
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Re: New methods to reduce the fan noise in a T60 or in a T60p

#59 Post by lab » Thu Mar 14, 2013 2:22 am

I took a quick look at the T61 EC and I think a similar approach as with the T60 is possible. The structure of the rpm settings is the same but not collected in one rpm table for all hardware versions. However the values are still easy to find:

2800 3050 3500
2800 3150 3500
3000 3350 3900
3000 3350 3800
2550 2800 3200
2550 2900 3150
2800 3050 3500
2550 2900 3100

I think the checksum test also is similar to the T60 EC, but I have not tested so here I might very well be wrong.

Last I did a test with the T60 EC and altered the checkword to see what would happen if I flashed my T60 bios with wrong checksum - winuptp.exe refused to flash.

lab
Posts: 46
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Location: Malmö, Sweden

Re: New methods to reduce the fan noise in a T60 or in a T60p

#60 Post by lab » Fri Apr 22, 2016 1:25 pm

lab wrote:I took a quick look at the T61 EC and I think a similar approach as with the T60 is possible. The structure of the rpm settings is the same but not collected in one rpm table for all hardware versions. However the values are still easy to find:

2800 3050 3500
2800 3150 3500
3000 3350 3900
3000 3350 3800
2550 2800 3200
2550 2900 3150
2800 3050 3500
2550 2900 3100


I think the checksum test also is similar to the T60 EC, but I have not tested so here I might very well be wrong.

Last I did a test with the T60 EC and altered the checkword to see what would happen if I flashed my T60 bios with wrong checksum - winuptp.exe refused to flash.
Finally I got hold of a T61 to test above. It turned out to be wrong table, at least for the integrated graphics mobo but I found the right one and also the proper checksums. My current setting is 2000 rpm but the fan still makes to much noise, shall test even lower and clean and oil the fan.

The rpm table in the T61 EC is somewhat different than for T60 but it works similar so it was relatively straight forward to find the rpm's and also the checksums in the EC for the T61.

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