Hello everyone. It works very slowly and the fan spins very fast. The touchpad was flooded. I replaced it but the MacBook is still very slow and the fan spins at high speed. Resetting and bypassing SMС does not help! Please tell me what to look for.
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Thermal sensors in trackpad - most likely. Lacking proper communication with the smbus based sensors will throttle the cpu speed and cause high fan spin. Inspect all but trackpad is a suspect. -
I installed the board in another case but the problem remained. I suspect that the problem is somewhere in the smc. The board is in perfect condition, there are no signs of moisture.Originally posted by mon2 View PostComment
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Measure the voltage to ground for the following pins:
I2C_THMSNS_SCL_R1
I2C_THMSNS_SDA_R1
I2C_THMSNS_SCL_R2
I2C_THMSNS_SDA_R2
The above SMBUS pins lead to the actual thermal sensors themselves which must be inspected.
Review
U5850
U5870
Each of the thermal controllers (above) are linked to individual transistors that must also be reviewed. If any of the above parts / communication lines are missing, you will have the observed result.Comment
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