Thinkpads Forum

aamsel wrote:I assume that this throws at least part, if not all of the warranty out the window?

Rhino wrote:

leeadam wrote:Do you guys think we can swap the heat sink 26R8197 on a 1875 model with 26R7957 on a 2686 model? I found the 1875 model have the copper for Northbridge, but not my 2686 model.

I need a reference for this part: 26R8197 Heatsink

If the unit is the same in specs, except it has a thin copper plate extending to the northbridge, then YES, it should work. But, be careful, as there is not much room between the northbridge and the wireless PCB (as you can see in my picture above). So this extra piece of copper stretching to the northbridge MUST be VERY thin. Since the northbridge is not the same level as the GPU, the copper must bend or be suited to fit perfectly on both surfaces in order to provide maximum contact of the surface area(s).

NRJ, send me the pictures! ) Use the same email address as before.

leeadam wrote:Do you guys think we can swap the heat sink 26R8197 on a 1875 model with 26R7957 on a 2686 model? I found the 1875 model have the copper for Northbridge, but not my 2686 model.

nrj45 wrote:Yep. It's a foil of copper (i said a sheet). Thickness : 0.3mm. You can work on it with scissors.

Yep i had to make different level since all DIEs were not at the same level (not easy because you have to have quite a flat horizontal surface for each DIE to improve the contact).

Rhino wrote:I would LOVE to just swap the fans as stated above. I need to see pictures of this fan with copper plate extending to the northbridge.

I hope we see some pictures soon.

Rhino wrote:Looks good, you did a great job NRJ

^rpm
|_________________________________
|
|
|
|
+--------------------------------------------> temp
35°C                                           66°C

^rpm
|                            ________________
|                     ______/
|              ______/
|       ______/
|______/
+--------------------------------------------> temp
35°C                                           66°C

^rpm
|                            ________________
|                     ______/____/
|              ______/____/
|       ______/____/
|______/____/
+--------------------------------------------> temp
35°C                                           66°C

nrj45 wrote:I think it depends on what power scheme you use. Since i use the same powerscheme wheter i am on ac or not i didn't notice that

nrj45 wrote:I made a perso profile called "perso" in the power management application.
If i un/plug the t43p, the lcd brightness will reset at the one specified in the scheme.

Rhino wrote:While this is from my other thread, I think it makes sense for people reading this thread to learn.

nrj45 wrote: Another thing that shocked me : look at the fan construction. It doesn't take cold air from inside the case at all. it takes cold air from the little hole at the top of the jacks (mic and ear). So when the fan is on, it doesn't make any airflow through the case.
Summary : the chipsets are triggering a fan that doesn't cool them.

I noticed this too.

While the fan is working hard, take out the slim-bay drive/battery and leave it open. Then put your fingers next to the open sli-bay slot. You can feel the system sucking in air, which suggests that when the bay is used, much needed air is having trouble entering. We are talking at opposite ends of the laptop.

• top purple sticker: 26R7849, FRU Fan Long M24, 26R7957, Made in China, Furukawa Electric Co. Ltd.
• top white sticker: SO50506CN
• bottom sticker: Hangzhou Toshiba Home Technology Electronics Co. Ltd., DC brushless, MCF-208AM05, DC 5V 0.3A, Made in China
• bottom stamp: 5426A