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nirajkp
Paper Tape
Posts: 4
Registered: ‎07-26-2011
Location: Delaware
Views: 779
Message 1 of 8

CPU fan may be broken, machine shuts down

Hello, new to the community and I need help with a hardware issue.  I have ThinkCenter M50 - 8190LUU model.  For about a month, the CPU fan was very noisy. I opened the case and after checking around, the noise was definitely coming from the CPU area.  Then today the fan seems to have stopped working because first the machine was very quiet, and then after using it for a while, the outside fan came on and stayed on.  After 15 minutes, the machine (running Ubuntu) shut itself down, gracefully.

 

I think I need a new part, but I don't know the difference between a fan sink and heat sink.  I would like to know whether I should try disconnecting/reconnecting, cleaning, some other procedures before replacing it.  Thanks......

 

Niraj

Retired Guru
Posts: 2,090
Registered: ‎07-13-2009
Location: USA
Views: 778
Message 2 of 8

Re: CPU fan may be broken, machine shuts down

You can simply watch if the fan starts on boot up.

If it was making noise, it probably failed.

 

(Best to boot to BIOS setup (F1 key) so you can just shut it

down if fan does not come on instead of booting

to Windows and risking damage from overheating)

 

To get an idea how to replace fan/heatsink, download

the hardware manual by right clicking this link and

choosing Save Link As... to save to your computer.

 

http://download.lenovo.com/ibmdl/pub/pc/pccbbs/thinkcentre_pdf/74p2661.pdf

 

Look for section Replacing FRUs -> Replacing a microprocessor.

(You can skip the steps for actually removing/replaceing cpu.)

 

Depending on the type/size of fan you may be able to just replace fan,

or you may need to replace the whole fan and heatsink assembly.

 

Post some photos of existing fan/heatsink

on a web photo sharing site if possible.

lead_org Microsoft MVP Contributor
Microsoft MVP Contributor
Posts: 21,009
Registered: ‎12-19-2008
Location: Australia, Melbourne
Views: 767
Message 3 of 8

Re: CPU fan may be broken, machine shuts down

heatsink, is without a fan (but sometimes people refer to fan sink as heatsink), and fan sink is the heatsink + fan unit.

You should able to get some of them on ebay.

From what you are saying the lack of fan cooling the cpu is causing the shut down. Given the age of your machine, the fan may just be worn out.
Regards,

Jin Li

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

I am a volunteer, and not a paid staff of Lenovo or Microsoft
nirajkp
Paper Tape
Posts: 4
Registered: ‎07-26-2011
Location: Delaware
Views: 748
Message 4 of 8

Re: CPU fan may be broken, machine shuts down

Duck3, I opened and the case and turned on the PC, and it is hard to see the fan from that angle because it is up against the drives.  Anyway, the part # is FRU 13N2951, which I just ordered, a refurbished one, hopefully it will last.  Got my fingers x-ed.  Thanks...

 

Oh thanks for the link too, that will help once the part arrives.

 

Niraj

nirajkp
Paper Tape
Posts: 4
Registered: ‎07-26-2011
Location: Delaware
Views: 643
Message 5 of 8

Re: CPU fan may be broken, machine shuts down

I got the new fan so I removed the old fan, which had CPU stuck to it.  So I removed the CPU from the old fan, and tried to put the cpu back in and then the new fan.  Turned on the machine, and now the new fan runs, but nothing comes on screen, HD is not accessed, machine won't shut down.  So I pull the plug and read the PDF, realized there's a socket handle.  So I move it into up position, put the CPU in and snap the socket handle back in and put the new fan back on.  However, the same issue continues when machine is turned on, nothing comes on screen, HD is not accessed.  It is as if the CPU is not there after the power is turned on.  I still have to pull out the plug to turn it off.  The external fan runs loudly at very high speed since switching out the heatsink.  Don't know why.  So right now I am worse off than before.

 

Hunting around the net for a possible cause...  if you can think of anything pls let me know.

 

Thanks,

Niraj

Retired Guru
Posts: 2,090
Registered: ‎07-13-2009
Location: USA
Views: 633
Message 6 of 8

Re: CPU fan may be broken, machine shuts down

You really should have read that pdf First!

1. Make sure that the microprocessor socket handle is fully in the vertical position.

Otherwise the microprocessor pins might be damaged when installing the microprocessor.

Read it again carefully, remove the heatsink/fan again,
and check the cpu for bent pins.

 

Did you clean the cpu and heatsink and use new thermal grease?
Be sure to install the cpu correctly.

2. Position the microprocessor so that the pins are aligned with the socket and with

the beveled corner in the correct orientation.

And, did you unplug the power before you swapped HSF?

nirajkp
Paper Tape
Posts: 4
Registered: ‎07-26-2011
Location: Delaware
Views: 621
Message 7 of 8

Re: CPU fan may be broken, machine shuts down

I saw 2 bent pins so using a pin, I straightened them out.  But that didn't fix the problem.  I didn't apply new thermal grease, I need to clean out the old grease and apply new grease.  But if I have straightened out the pins and it doesn't work, I am wondering if I should even bother with the grease now.

 

I did unplug the computer before I swapped out the HSF.

Retired Guru
Posts: 2,090
Registered: ‎07-13-2009
Location: USA
Views: 600
Message 8 of 8

Re: CPU fan may be broken, machine shuts down

I would guess the cpu is ruined.

Possibly the motherboard.

 

Used cpu for that is real cheap,

model number and type is imprinted on the cpu.

 

I THINK it is like this: (no guarrantee)

 

http://www.geeks.com/details.asp?invtid=P43000C478&cat=CPU

 

There are others that that will work for testing,

maybe you have a used computer store, or repair

shop where you can find one?

Socket 478 P4 @ 800 mhz front side bus.

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