Fan is on all the time
I have read similar threads here but not exactly this one. I had my MacBook Pro 2.4Ghz for motherboard repair. When I got it back the fan is an all the time, even when the MB is cold. I have done the SMC reset, PRAM reset etc. with no help. I ran iStat Pro and it says that left fan is 0 rpm and right fan is 2000 rpm. So I opened up the MacBook and I see that the left fan is the one really blowing away while the right fan is moving much quieter. The CPU load is low and the temps are low. I read about someone suggesting a sensor might be disconnected and that could be the reason iStat does not see a left fan even though it is blowing like crazy. Does anyone have a link to where I can check if this sensor is not correctly in place after the repair? Just to make sure I am testing with 85W power.
Here is what I did. I opened the MacBook Pro and removed the left fan cable. Careful, careful, the correct way to remove these contacts is to gently pry with a spudger (Spudger) or similar and gently pull upwards. Look carefully for the text "Push" on top of the contact. I know because I have done my mistakes on these cables through the years :-(
I inspected the cable and made sure they were well seated into the contact. Put the fan cable back in place and now both fans are visible in iStat. So it must have been one of the 4 cables to the contact that has come loose when the fan was put back. Horray! MacBook Pro 2.4Ghz with 256MB vram ATI8600M (not bad really!) working for me again :-)