Fans always max speed from boot

Hi,
my macbook pro unibody (15") has fans always on at maximum speed even. No matter the temperature of cpu or % of CPU activity (smcfan is of no use). Batteries drained in one hours...no use of a portable,
After an hardware check it seems some temperature sensor were not working properly.
I've got my logic board changed and.......fans keep running at top speed and now also keyboard backlight is gone....any suggestion...I'll ask to change the machine that is clearly faulty somewhere...
Any hints from Apple?
Ciao
Nik

Have you tried running the extended version of the Apple Hardware test? If you get an error code indicating the sensors, it may be that they were not properly plugged into the logic board following the logic board replacement. If the sensors are not sensing the temperature, the fans will run all out by default. If the sensors themselves are faulty, then replacing the logic board will not cure the problem.
For the backlight, check in System preferences>Keyboard & Mouse> Keyboard and make sure the box is checked to illuminate the keyboard under low light conditions. If it is and the keyboard still does not light, the keyboard backlight flex cable may not have been well seated.
Who did the repair? Apple or an AASP? If the latter, it may be worth trying someone different. It sounds like the logic board replacement may not have been done as carefully as it should have been.
Good luck!

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