Post originale di: Peter Randall ,
Hello I have answered this question many times First install SMC fan control of similar program. Check that the program control the fan speed. If it can not control the fan then the problem is with the fet driver in that it is connected by failure to the s5 rail which is live all the time when machine is off. If you can control it the problem in my experience is the SMC chip which has failed. Change it.