Left fan spins full speed at startup since logicboard repair
Since having my logicboard repaired following a no-boot-at-all problem, my left fan spins like crazy from startup. Right fan appears normal.
1) Left fan starts at startup (i.e. as soon as power button is pressed).
2) iStats Menu indicates:
a) left fan 0 rpm (but left fan is spinning at top speed, opened MBP to check)
b) right fan 1998 rpm (normal)
c) Overall temperature 30 deg C (GPU heatskink 35 deg C, Heatskink A 33 deg C, Heatskink B 30 deg C, all other readings about 30 deg C)
3) Apple Hardware Test (done twice) reads:
Alert! Apple Hardware Test has detected an error.
4MOT/1/40000002: Left side-0
Pass Number: 1
Total Time Testing: 2mins 55 secs
C) ATTEMPTS TO FIX:
PRAM, NVRAM and SMC reset - No change.
Any suggestions as to what might be the problem and how to fix it? Hardware or software? Are there any other tests to do to determine the cause?
Thanks in advance,
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