[SOLVED]820-3437-A fan spinning very fast

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arash

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the board has very very little sign of water, but no component is oxidated or missing, the laptop works perfectly, any idea where to start?
 

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MUUK

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(After trying new fan) Check that the fan plug is sitting in the socket correctly as if pin 2/3 not connecting it may run full check that the socket does not have broken pins 2 or 3 to the board. Check resistance of R6061 (100k), R6065 (47k), R6060 (47k) (page 45 of schematic) check continuity and shorts to ground in this area - could be Q6060 not controlling properly. Had very similar problem (and ASD results) on an iMac recently and it was one of those resistors that someone had knocked off the board.
 
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