Computer slow, fans full speed when internal keyboard removed

Question

MacBook Unibody Model A1278

13" 알루미늄 unibody, 2.0 또는 2.4 GHz Core 2 Duo 프로세서.

574 질문 전체 보기

질문 마감됨

Emil Johansen @emiljohansen

평판: 1

게시일: 2013년 10월 28일

옵션

Computer slow, fans full speed when internal keyboard removed

I have a MacBook Unibody 2008 2.4GHz that has broken screen hinges. Therefore, I decided to gut it and use it as a micro desktop.

When everything non-essential is detached, the fans go at full speed and the mac is slow as syrup. The time from power_on to white screen is also significantly longer.

As I don't need the internal keyboard I'm quite annoyed to find out that it needs to be connected for the mac to run at full speed.

What I need now is a work-around. Can you guys help?

I short pin 29 and 5 on the power connector to make it boot. Can I short other pins to make it fast again?

답변되었습니다! 답변 보기 저도 같은 문제를 겪고 있습니다

좋은 질문 입니까?

예 아니요

점수 0

댓글 달기

답변 1개

선택된 답변

originalmachead @originalmachead

평판: 116.3k

66

68

359

게시일: 2013년 10월 28일

옵션

As a workaround leave the keyboard on and use a bluetooth or USB keyboard/mouse. You can still hide the unit and have it working at best speed.

My best guess is that the keyboard is pressing/flexing a sensor cable into making good contact. When the tension is released the cable shorts causing a fault to the EFI which runs the fans at max (default setting to save the CPU).

You can try to figure out with the careful use of a magnifier and mirror (no power) to peek under the keyboard which sensor is the best candidate for the bad connection - or - just leave it as it is (If it ain't broke, don't iFixit).

해당 답변은 도움이 되었습니까?

예 아니요

점수 1

댓글 2개:

Thanks for the reply. That is of course a possibility, but that will defeat the whole purpose of the project; A incredibly small full-fletched PC.

I also figured that it is some sort of safe switch or maybe that caps lock diode that works at some sort of built in diagnostics, but I unfortunately do not have the expertise to find out what is the actual culprit.

Does anyone have first hand experience with this?

Emil Johansen 의 2013년 10월 29일

I am not aware of any onboard sensor/component in the top case. For diagnostics running the laptop with an alternate keyboard/mouse is a standard practice.

originalmachead 의 2013년 10월 29일

댓글 달기

Thanks for the reply. That is of course a possibility, but that will defeat the whole purpose of the project; A incredibly small full-fletched PC.

I also figured that it is some sort of safe switch or maybe that caps lock diode that works at some sort of built in diagnostics, but I unfortunately do not have the expertise to find out what is the actual culprit.

Does anyone have first hand experience with this? — Emil Johansen
I am not aware of any onboard sensor/component in the top case. For diagnostics running the laptop with an alternate keyboard/mouse is a standard practice. — originalmachead