Guido's cooling system for the T43p
The T43p has a real problem with the fan noise and cooling in general.
The fan needs to be always on as the cooling system is not very sophisticated.
Here is a description of the cooling system improvements which I made using
some small cooper sheets (0.7mm thick). The result is that the
temperature of the Southbride has gone down by 5'C!
In summer I will however need a fan control script as the Southbride
will probably not go below 38'C during normal operation (the embedded
controller switches the fan off at 37'C and on at 43'C).
The GPU which is next to the Southbride
and can get hotter than 45'C. Therefore don't connect Southbride and GPU.
This article is about improving the really poor thermal design of the t43p. For a description
of how to fix the fan noise problem see Thinkpad fan-noise fix.
The keyboard from the bottom. The little board is for the red mouse
I understand now why IBM did not cool the northbridge. It looks like
there is a lot of space above the silicon but this space is needed for
the little board of the mouse pointer under the keyboard. There is only
3mm of space. Very little for a cooling system. The only thing one can do
is spread the heat over a larger area.
The southbridge which gets too hot even with low cpu speed and
power saving of the GPU is under the mini pci WiFi card.
The idea is to cool the southbridge with a cooper sheet and hold it in
place with the keyboard screws. I made first a cardboard model and then
cut the piece out of a 0.7mm cooper sheet.
Paint it black and put heat resistant insulation foil under the
A small piece of soft rubber between the WiFi card and the cooper presses the cooper
against the southbridge.
The pcmcia slot has on the side some holes. This causes to fan to suck
air directly via the pcmcia slot. I covered the side with a bit of plastic
to improve the air flow through the computer.
Now the northbridge.
I used some thin plastic foil which can be used for
insulating transistors on an aluminium cooler. This plastic can
withstand 200'C. From this plastic foil I made a half open box to
hold the cooper in place and insulate it against the resistors which
are mounted on the northbridge chip.
Attach the cooper to the plastic foil with a little bit of glue.
The "heatspread" over the northbridge.
A soft rubber between the keyboard and the cooper presses the cooper
against the northbride.
© Guido Socher, guidosocher at gmail.com, ->back to the main t43p article