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820-00165 Fan high speed (Another!)

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DaveDD

Member
Hi guys
Very tiny liquid damage.
Macbook came in with a problem on SMC Reset. Everytime the power button was triggered, smc will perform a reset and macbook will not start .
I Fix it and now it works but fans goes high speed.

Tested with only trackpad, I/O Board, fan connected.
Already tried changing trackpad & flex.
Fan goes high rpm when loading MacOS but stays low rpm with SSD disconnected.
(So the issue is when it switch in SPI, right?)

U4810 goes to correct value when OS is loading....
Pin 1,3,5,6,8 =3,3v

Diode mode measuring on J4800 are OK compared to another working board.

No Issues found in AHT.
All temperatures ok on HWMonitor.
Macbook speed seems regular.
In system preferences- Trackpad , no device can be seen, so no personalization is avaiable. But trackpad works with no issue.
In system report - SPI - I can see the trackpad listed.

R4850-4851-4852-4853 are ok.

Can be ME region corrupted? No one touched U6100 before...
 
2informaticos

2informaticos

Administrator
Staff member
"In system preferences- Trackpad , no device can be seen"
Need to connect battery, if you want to see trackpad there.

"Fan goes high rpm when loading MacOS but stays low rpm with SSD disconnected"
Discard software issue first.
Boot with different SSD, or from USB macOS.
 
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DaveDD

Member
No issues with Usb MacOS.
I've already wiped SSD drive and reinstalled Macos before, but issue still remain.
Now I'm trying with a different SSD from donor... i'll keep you updated.

With battery connected, Trackpad is OK in system preferences. Why I need battery to show up that?
 
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DaveDD

Member
Changing the SSD solved everything.

With the customer SSD, even if the drive is totally wiped, even with Windows installed on It, the fan goes up at max.

With another but IDENTICAL model , MacBook works like a charm.

Today lesson: SSD can trigger fan Speed even if it seems to be ok, and no error reported.

Can't wait to try this "faulty" SSD in another machine to see what happens.

Mark as solved.
Thank you 2informaticos!
 
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