on-site warranty regarding t43

[LeonQ]

one guy from ibm came by my place and serviced my t43 regarding the fan-always-on issue, he was professional and replaced the fan, but the fan still stayed on after 5-10mins warm-up , finally he admitted this was "normal" for a t43, he found the hot-spot is the chip right under the touchpad, but it was covered by the wireless card instead of the heat pipe, that hot chip tripped the fan, the fan was struggling but it cannot conduct heat from that hot-spot, that's why the fan always on but the air it blew is cool.

[K. Eng]

My T40 is the same way. If I have WiFi off, the fan will turn off. If I have WiFi on, heat builds up in the area under the touchpad and the fan will never turn off, even when the CPU and the rest of the system is relatively cool.

[JHEM]

My T40 is the same way. If I have WiFi off, the fan will turn off. If I have WiFi on, heat builds up in the area under the touchpad and the fan will never turn off, even when the CPU and the rest of the system is relatively cool.

I have had exactly the opposite experience with my T40, two T41p and a T42p. None have experienced the "always on" fan and all have the IBM a/b/g card installed, which is rarely turned off.

Regards,

James

[rssb]

It is same as what James said, in a T42p with IBM a/b/g card and on wireless (even after 7 hrs), the fan was not blowing hard at all, it seemed to work at very slow speeds blowing some warm air out.

This might be due to some other chip, unless right underneath the wireless card in a T43 there is chip which makes the difference. But in a T40 atleast the chips should be similar to T41's and T42's.

A plausible reason could be the T40 had a short fan, which was not cooling the GPU, which makes more sense in case of a T43 because the heat pipe is not exactly same as the T41's and T42's even though it is long and covers the GPU. The newer heat pipe desgin in T43 might not be cooling the GPU as efficiently as the T42's one and hence the fan stays on ?