[ltp] T23 fan silent after board replacement

[Tino Keitel]

Hi folks,

I replaced the system board in my T23, because it didn't charge the
batteries anymore. Now the fan stays silent, even if the CPU temperature
reaches 70 °C, which it never does with the old system board.

If I switch on the ThinkPad, the fan will run for a few seconds, like
it used to do with the old system board. But after this, it stays
silent.

I checked the BIOS and embedded controller versions, which turned out
to be old. I installed the newest version from the IBM website, without
any changes in the fan behaviour.

Any hints what I can do to get the fan working?

Regards,
Tino