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Numero modello A1707. Rilasciato a giugno 2017, questo MacBook Pro adotta processori Kaby Lake fino a Intel Core i7 quad core da 2,8 GHz con Turbo boost fino a 3,8 GHz.

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Left fan stuck at high speed

I spilled a little water on the keyboard and immediately dried it out. The laptop functioned perfectly fine after. I was worried that there could be some water deep inside so, a couple days later, I removed the logic board to clean underneath it. There was not any water there. I used canned air to clean out dust, and a hairdryer to make sure there was no water. After reassembling, the left fan has been stuck at full speed whenever the computer is running. I did not remove the fan during this cleaning.

I am using iStat Menus. The thermal sensors appear to be fine.

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I am able to use iStat Menus to set the fan speed for the right fan but the left does not respond to the controls.

I tried resetting the SMC and PRAM. I ran an Apple Diagnostics and it said there may be a problem with the fan. I installed a replacement fan and the problem still persists.

What can I do to get the fan under control? Could the heat from the hair dryer have damaged the fan connector or its circuit?

Risposto! View the answer Anch'io ho questo problema

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Soluzione Prescelta

I seriously doubt canned air would have damaged anything on the logic board..fact is that even if a small amount of water reached the board it might have shorted out a secondary but certainly not useless component.

Fact is that due to the size of parts it's hard to see anything with less than 10x magnifying and often one can't see anything at all and just needs to test power/data lines. If it spins full speed and a replacement fan and smc reset didn't help it's likely the fan speed control data line or related component got damaged. I'm afraid you'll need a component level repair professional here.

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Thank you. That makes sense.

da

Did you ever get it repaired or looked at by a company that does component level repair?

da

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You’ll need to run the onboard diagnostics to see what it tells you. Restart your system and hold the D key. That will get you in, once you get an error code let us know. Depending on what you get you may need a new fan or you forgot to connect something.

Reference: Mac startup key combinations

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Check Q6050 and Q6000 on board and resistors near too. For model A1707.

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Exactly! Thanks!

da

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@tbertin Hello! I have same problem on my MBP 15’ 2017. How did you solve this problem?

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Hi, I have the same problem as well. Did you solve it?

da

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Hi! I have the same issue and I found out one of my transistors, more specifically Q6050 was mising from my board. It was yanked out most probably during reassembly. (Oh yeah, and a resistor too)

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As you can see the trio of black resistors and the transistor in between should be complete each fan but the one at the bottom has missing parts.

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The transistor is the black block while the resistors are the silver ones with a black middle. I've ordered these parts online and I'll get back if it fixes the issue.

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Same for me, thanks. Seems that keyboard ribbon connector cause damage to it, when left under system board.

da

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Hello! I have the exact same problem. The left fan stuck at 6500rpm and the right fan is fine. The left fan is also not manually controllable by the Fan control software like TF Pro. How did you solve the problem? Thank you.

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Was this resolved? Please let us know!

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just recover broken MOSFET (you need a donor board, microscope (lens is not enough), and small soldering iron, if trace is broken you will need a thin wire also) and FAN control will be available again.

da

Could you help me understand what is MOSFET? I googled it and I see it's a chip. How do I identify it for my MacBook?

da

I did not fix it. It likely needed component level repair which was not worth the cost to me.

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i have mid 2015 15” Macbook Pro, its right fan is showing 5700 rpm max but left one is 6156 rpm max at mac fans control app. Shouldn’t they be at same rpm? Or is it normal as default?

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on my 2016 15" Pro Left 5927 Right 5489, seems that it is normal

da

@Sergey Alright thank you!

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Tristan Bertin sarà eternamente grato.
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