User profile for user: wamwii
wamwii Author
User level: Level 1
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Fan problem after installing aftermarket replacement battery

I have an Apple MacBook Pro 15-Inch "Core i7" 2.8 Touch and I recently changed out the factory battery for an IFIXIT battery replacement kit and followed these instructions. The replacement happened without any issues but now for some reason my right side fan is blowing at a high RPM and it is not being detected when I use a fan control app like Mac Fan Controls. With that said, I think because it is not being detected the fan is running at a high RPM by default. Before I take it all apart again to see if I missed anything, does anyone have an idea what the issue may be?


Posted on Dec 15, 2022 05:17 PM

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User profile for user: HWTech
HWTech
User level: Level 9
66,758 points

Posted on Dec 16, 2022 05:58 PM

It is hard to say, but the easiest thing to check is to reseat the Keyboard cable to the Logic Board (make sure to disconnect the battery first ... both the flex cable and BMU screw). I would also inspect the Keyboard cable and the connector on the cable and the Logic Board for physical damage (shown in Step# 23).


If that doesn't help, then I would physically check that right fan's cable and connector (make sure you are looking at the correct fan when the laptop is apart...in Step# 50 the right fan is shown on the left in the picture), but this requires removing the Logic Board again. The fans connect to the Top Case Assembly and Keyboard. The fan flex cable and fan connector are very delicate and easily damaged. Maybe the locking lever on the fan lifted during your repair. The locking lever is very easy to break no matter how careful you are with it. Usually the lever breaks when trying to close the lever as the lever tends to slide off the connector instead of rotating closed.


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User profile for user: HWTech
HWTech
User level: Level 9
66,758 points

Dec 16, 2022 05:58 PM in response to wamwii

It is hard to say, but the easiest thing to check is to reseat the Keyboard cable to the Logic Board (make sure to disconnect the battery first ... both the flex cable and BMU screw). I would also inspect the Keyboard cable and the connector on the cable and the Logic Board for physical damage (shown in Step# 23).


If that doesn't help, then I would physically check that right fan's cable and connector (make sure you are looking at the correct fan when the laptop is apart...in Step# 50 the right fan is shown on the left in the picture), but this requires removing the Logic Board again. The fans connect to the Top Case Assembly and Keyboard. The fan flex cable and fan connector are very delicate and easily damaged. Maybe the locking lever on the fan lifted during your repair. The locking lever is very easy to break no matter how careful you are with it. Usually the lever breaks when trying to close the lever as the lever tends to slide off the connector instead of rotating closed.


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Fan problem after installing aftermarket replacement battery

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