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X61 and its super loud, pointless secondary fan

X60/X61 and X60t/X61t Series
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wujstefan
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X61 and its super loud, pointless secondary fan

#1 Post by wujstefan » Tue Jun 14, 2022 9:00 am

Hello lads,

I'm back on feet and back working on thinkpad stable I have here. X61 got the shot now.

I was lucky to get a T9300 unit with one of the latest production dates.
Runs and feels fantastic, HOWEVER it has the secondary fan under the palmrest that does nothing else just mixes the air inside - guess this was for wireless cooling. Thingy is, when it spins of, the system is EXTREMELY loud. I cannot take this particular fan out - the system produces a fan error, and TPfancontrol just spins both fans at presumably same speeds, resulting in huge amount of noise.

Other than that, when tpfancontrol is installed, the system won't turn off itself at all :D

Is there any known way to remove the fan and prevent the system from checking its presence?
Too many thinkpads not enough time!
(stable under reduction)

dr_st
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Re: X61 and its super loud, pointless secondary fan

#2 Post by dr_st » Tue Jun 14, 2022 10:06 am

Presumably - do something with the fan connector on the board, but I am not the person who knows what exactly. :)
Thinkpad 25 (20K7), T490 (20N3), Yoga 14 (20FY), T430s (IPS FHD + Classic Keyboard), X220 4291-4BG
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad

wujstefan
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Location: Tarnow, Poland

Re: X61 and its super loud, pointless secondary fan

#3 Post by wujstefan » Wed Jun 15, 2022 1:09 am

I don't think it would help, really :/

This particular fan is controlled by eeprom U99. It seems to share the control but... with a different tachometer? If one of those fan stops, I will get a fan error. If I try to control any of them, I control both just the same way. Duh. I _THINK_ I have seen a piece of hardware using NE555 pulse generator, but creating such PCB myself is out of my skill range :D
Too many thinkpads not enough time!
(stable under reduction)

mikemex
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Location: Coyoacan, Mexico

Re: X61 and its super loud, pointless secondary fan

#4 Post by mikemex » Wed Jun 15, 2022 2:35 am

You could remove the fins from the fan and just leave the core. It'll still spin but make far less noise.

T61: T8300 | 8GB | 400GB S3610 | SXGA
X301: SU9600 | 8GB | 400GB S3610
T420s: 2640m | 16GB | 400GB S3610 | HD+ 4200M
W530: 2740qm | 32GB | 400GB S3610 | FHD K1000M
X1C5: 7600U | 16GB | 512GB XG6 | FHD
P14s G1 AMD: 4750U | 32GB | 1TB PC611 | PG FHD Touch
T14 G2: 1145G7 | 32GB | 256GB PC711 | FHD

axur-delmeria
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Re: X61 and its super loud, pointless secondary fan

#5 Post by axur-delmeria » Wed Jun 15, 2022 5:22 am

Anyone tried a jumper wire from the main fan's RPM sense pin to the corresponding pin on the 2nd fan?
Daily driver: X220 4291-C91 i7-2620M

Backup: X601 Core 2 Duo T8100
Toy: X60F Core Solo U1300
On loan: X220 4291-P79 i5-2520M
In pieces: two retired but working X61Ts
RIP: 760XD 9546-U9E; X61 7676-A24; and a BOE-Hydis HV121P01-100 in failed SXGA+ mod
:cry:

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