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Paper Tape
xur17
Posts: 3
Registered: ‎03-28-2012
Location: United States
0

Thinkpad T61 Pulsing Fan Issue

I have a Thinkpad T61 that I just recently replaced the fan in (it was dying, and making loud grinding noises when running).

 

The new fan works fine, but it seems to pulse (turn on for ~5 seconds, then turn off for ~5 seconds, and repeat), which is rather annoying / irritating.  This occurs in both windows and linux (ubuntu)

 

I don't think this was hapenning before I replace the fan, but it is hard to know since the fan was having other issues.

 

Is there some easy way to fix this, or to force the fan to a specific speed?

Punch Card
Cloakedboltz
Posts: 25
Registered: ‎05-17-2010
Location: Canada
0

Re: Thinkpad T61 Pulsing Fan Issue

That's odd. Maybe that fan is just so good that it only needs to give a vent every 10 seconds, quickly heats up again and turns back on.
Paper Tape
xur17
Posts: 3
Registered: ‎03-28-2012
Location: United States
0

Re: Thinkpad T61 Pulsing Fan Issue


Cloakedboltz wrote:
That's odd. Maybe that fan is just so good that it only needs to give a vent every 10 seconds, quickly heats up again and turns back on.

I'd rather it just stayed on the whole time instead then.

lead_org
Posts: 20,905
Topics: 128
Kudos: 1,254
Solutions: 1,343
Registered: ‎12-19-2008
Location: Australia, Melbourne
0

Re: Thinkpad T61 Pulsing Fan Issue

did you have proper coat of the thermal paste on the heatsink? also did you get the fan new? and is it an original part?

You can install software like TPfancontrol to control the fan speed and behaviour.
Regards,

Jin Li

May this year, be the year of 'DO'!

I am a volunteer, and not a paid staff of Lenovo or Microsoft
Punch Card
Cloakedboltz
Posts: 25
Registered: ‎05-17-2010
Location: Canada
0

Re: Thinkpad T61 Pulsing Fan Issue


lead_org wrote:
did you have proper coat of the thermal paste on the heatsink? also did you get the fan new? and is it an original part?

You can install software like TPfancontrol to control the fan speed and behaviour.

That's smart. Usually replacing the fan means replacing the heatsink unit too.

 

I suggest trying to wipe off the thermal paste and putting fresh one.

Paper Tape
sauerquint
Posts: 4
Registered: ‎01-27-2010
Location: Anchorage, AK
0

Re: Thinkpad T61 Pulsing Fan Issue

Well, if you haven't ever replaced the fan without doing the heat sink then you shouldn't be making 'smart' comments like that. There is a separate part number for the fan right there on the Lenovo site.
Bit Torrent
TuuS
Posts: 2,029
Registered: ‎01-02-2011
Location: US
0

Re: Thinkpad T61 Pulsing Fan Issue

I believe when purchased from lenovo, the fan and heatsink are only available as an assembly, but you can buy only the fan from other sources. Once the heatsink is removed it's a simple matter to install a new fan. 

 

Regarding the OP questions...    if the cpu temperatures are changing that irratically, then I'd suspect there is poor thermal contact, so perhaps you should try cleaning the thermal paste and using Arctic Silver #5 brand. Be careful not to use to much or to little, when properly applied, it should keep the fan to minimal levels. On mine I have a hard time telling when it's running, I can only really hear it if my cpu get's stressed and it kicks into high gear...   perhaps that is what's happening in your case, you're only hearing it when it runs on the highest speed.

 

As mentioned, thinkpad fan control (tpfancontrol.com) will help you monitor the temps and the running speed. 

ThinkPad W-510 i7-820QM(1.73-3.06GHz) Quad Core... ThinkPad T500, T9900, 8gb SSD...FrankNpad T-60p/61p (X9000 2.8ghz) 8gb SSD ips FlexView...ThinkPad T-61p (T9300 2.5ghz) 8gb ram...Thinkpad X-61 Tablet 4gb ram...ThinkPad A-31 (1.9ghz P4 1.5gb ram)
lead_org
Posts: 20,905
Topics: 128
Kudos: 1,254
Solutions: 1,343
Registered: ‎12-19-2008
Location: Australia, Melbourne
0

Re: Thinkpad T61 Pulsing Fan Issue

the fan/heatsink unit is purchased as a complete unit, when i mentioned did you purchase the fan new (i was actually referring to the complete unit).
Regards,

Jin Li

May this year, be the year of 'DO'!

I am a volunteer, and not a paid staff of Lenovo or Microsoft