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7 Posts

08-31-2014

Hungary

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T520 rear fan louver covered/blocked

2014-08-31, 13:36 PM

Hi,

 

I've recently bought a used Thinkpad T520 i5 2520m with IGP (3000) and I'm experiencing minor overheating issues. Idle is around 50C, during stress test around 75-80C, but the bottom is warm at idle, and gets pretty hot even at 5-15% CPU (using Microsoft Word and Chrome browser). After removing the keyboard, I cleaned the cooling unit using a compressed air spray (blocking the fan to not rotate during the cleaning process), but I haven't removed the cooling itself yet, to apply new heat-conductive paste. I will also do that next week but there is an interesting I've just discovered during the cleaning process. There are two fan louvers at the left side, one at the rear left. However, the rear fan louver (part 4 on the screenshot below ) is fully blocked/covered with a piece of black plastic, behind the grille. This may also cause some overheating.

 

Rear fan louver (4) covered on my T520:

http://support.lenovo.com/us/en/documents/~/media/Images/ContentImages/p/pd025347_t520_rear_01.ashx

 

I have another T520 which has free fan louvers at each side, maybe because of the different configuration: i5 2410m with Optimus (NVS 5400).

Is there any configuration where one of the fan louvers is blocked by factory?

 

Thank you for your kind help in advance.

 

Best regards,

Balazs Nagy

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725 Posts

11-21-2013

United States of America

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Re: T520 rear fan louver covered/blocked

2014-08-31, 13:47 PM

<< is blocked by factory>>

 

Maybe it wasn't done at the factory.  The Thinkpads I have here are all untaped, front and rear.  I'd open it up and take that off if it were mine.

 

Maybe the previous owner was using the device to heat his room or something.

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7 Posts

08-31-2014

Hungary

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Re: T520 rear fan louver covered/blocked

2014-08-31, 14:02 PM

I took a picture about it:

 

Link to image

 

Moderator note: large image(s) converted to link(s):  About Posting Pictures In The Forums

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725 Posts

11-21-2013

United States of America

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  • Message 4 of 11

Re: T520 rear fan louver covered/blocked

2014-08-31, 14:13 PM
The user's guide describes fan louvers left and rear. Not, "fan louvers left and blocked in the rear".

That pic looks like tape with dust stuck to it.

Really, take that off.
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7 Posts

08-31-2014

Hungary

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  • Message 5 of 11

Re: T520 rear fan louver covered/blocked

2014-08-31, 20:06 PM
I removed the keyboard bezel to access the cooling unit. It looks like that the cooling unit is surrounded by a plastic cover, even at the rear, except at the left side. It seems like it cannot be easily removed and its only output is at the left. This is a Foxconn thermal unit (FRU 04W1580) by the way. Can you please help me where can I find part numbers to check if it's original or not?

Thanks,
Balazs
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7 Posts

08-31-2014

Hungary

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  • Message 6 of 11

Re: T520 rear fan louver covered/blocked

2014-08-31, 20:21 PM

I've found this part number in the maintenance guide. It's the thermal module for integrated GPU models. My other T520 has dedicated Nvidia GPU, with different thermal module.

 

Regards,

Balazs

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725 Posts

11-21-2013

United States of America

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  • Message 7 of 11

Re: T520 rear fan louver covered/blocked

2014-09-01, 8:36 AM

I learned something.

 

Who knew they'd make a part to only take advantage of one of two exhaust ports.

 

Therefore, if the PC is running hot, perhaps it's time to pull the fan assembly and regrease the processor.

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13 Posts

09-16-2011

Dimitrovgrad, Bulgaria

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  • Message 8 of 11

Re: T520 rear fan louver covered/blocked

2014-09-01, 18:45 PM

Rear vent is blocked on i3 processor.

I had the same thoughts when I bought my T520.

Disassebled it the first day, and found its made like that.

 

Link to image

 

Moderator note: large image(s) converted to link(s):  About Posting Pictures In The Forums

Thinkpad T520i: i7-2860QM, 16GB RAM, 500GB Seagate, Linux
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7 Posts

08-31-2014

Hungary

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  • Message 9 of 11

Re: T520 rear fan louver covered/blocked

2014-09-04, 22:18 PM
After I cleaned the cpu and the thermal module, I applied some thermal paste, but nothing's really changed. Idle is now between 43-48 degrees, during stress test it goes up to 80. Until about 50-55 degrees, the fan is off, and as a result, the bottom is pretty hot. If CPU usage is higher, fan finally turns on and cools the bottom a bit. As soon as CPU goes back to idle (800MHz, 1-3% usage max.), the bottom gets hotter again. In the energy setting, fan is set to active in every mode, I don't understand why it stops running as soon as CPU is idle.

Regards,
Balazs
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7 Posts

08-31-2014

Hungary

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  • Message 10 of 11

Re: T520 rear fan louver covered/blocked

2014-09-08, 14:20 PM

In my opinion, the only solution at this is point would be to use tpfancontrol, to have the fan start at a lower temperature.

Why do you think?

 

Thanks,

Balazs

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