2 Won't power on while battery cable is connected after fan replacement
As title says, I performed a fan replacement, but then the macbook wouldn't turn on. I followed MacBook Won't Turn On and identified that when the battery cable is removed, I can power on while the power connector is plugged in. Obviously there is no battery detected when this happens
Before the fan replacement, battery was in excellent condition and no issue
How should I fix this? Do I need to buy a new connector cable?
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So, you only replaced the fan unit you didn’t remove the battery of logic board, correct? Also which fan left or right?
Could you have damaged something in the process?
- de Dan
I replaced both left and right fans at the same time.
Of course it's possible something could have been damaged, but I was very careful and followed the official guide. Nothing appeared to be out of the norm
Unfortunately, I'm noticing that when I power on (with battery disconnected) the fans ramp up to 100% very quickly, and kernel_task is using >1000% CPU. I am unable to reset PRAM/NVRAM
Official Apple fans were used for the replacement
- de Aaron Massicotte
@aaronmassicotte - the fans ramping up is expected! SMC is going into CPU Safe Mode where it will do this when key sensors are lost, it will also lower the CPUs clocking as well.
What guide did you use?
- de Dan
I used https://www.youtube.com/watch?v=IBnmbcZP...
So are you suggesting that in addition to the battery, a temperature sensor was also lost? Or is this simply normal behaviour if the battery is not connected?
Can confirm when running pmset -g thermlog, that CPU_Speed_Limit = 20 and CPU_Scheduler_Limit = 40
**** SMC sensors ****
CPU Thermal level: 255
GPU Thermal level: 100
IO Thermal level: 100
Fan: 5556.93 rpm
CPU die temperature: 32.57 C
GPU die temperature: 35.00 C
CPU Plimit: 40.00
GPU Plimit (Int): 15.00
Number of prochots: 0
Performance Limited Due to:
CPU LIMIT PROCHOT
GPU LIMIT PROCHOT
CU/GPU Overlap: 14.34%
Cores Active: 39.66%
GPU Active: 32.11%
Avg Num of Cores Active: 1.54
- de Aaron Massicotte