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cilo59
Paper Tape
Posts: 4
Registered: ‎05-18-2017
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Message 1 of 8

T440 won't power on with bottom case on

Here's a new one, I have an T440 that will not power on if the bottom case is on. Take it off and it powers on via AC or on battery but if the case is on, the only way it boots is if the internal and external batteries are disconnected and AC is connected. I have tried 2 motherboards and 2 internal batteries. It has the latest BIOS and Lenovo updates (as of May 18th, 2017). Any one out there encountered a similar scenerio?

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Message 2 of 8

Re: T440 won't power on with bottom case on

  What does the BIOS say under security/internal device access/tamper detection.  Examine the inside of the bottom case, especially in the area of the tamper detection switch.


Rich


I do not respond to requests for private, one-on-one help. Your questions should be posted in the appropriate forum where they may help others as well.

If a response answers your question, please mark it as the accepted solution.

I am not an employee or agent of Lenovo.
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cilo59
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Message 3 of 8

Re: T440 won't power on with bottom case on

Tamper detection is disabled and I tried a bottom case off of a functioning T440 but the issue still prevails.

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Message 4 of 8

Re: T440 won't power on with bottom case on

If you tried 2 motherboards and 2 covers, the only other part involved is the little power button card.  I'm not sure how it would cause your symptoms, but they do fail.  I would try that.  You only need to remove 2 screws from a hinge and swing it out of the way.  Be sure to get the card back so it is flat.


Rich


I do not respond to requests for private, one-on-one help. Your questions should be posted in the appropriate forum where they may help others as well.

If a response answers your question, please mark it as the accepted solution.

I am not an employee or agent of Lenovo.
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Message 5 of 8

Re: T440 won't power on with bottom case on

Can you provoke the failure by just having the base cover assembly in place - or do you need to install the screws to make it fail?

 

Z.


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cilo59
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Message 6 of 8

Re: T440 won't power on with bottom case on

Just having the bottom cover on without installing the screws is enough to make it fail.

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Message 7 of 8

Re: T440 won't power on with bottom case on

I am guessing a short in one of the cables that comes through the hinges.  It is possible the cover slightly moves one of them.


Rich


I do not respond to requests for private, one-on-one help. Your questions should be posted in the appropriate forum where they may help others as well.

If a response answers your question, please mark it as the accepted solution.

I am not an employee or agent of Lenovo.
cilo59
Paper Tape
Posts: 4
Registered: ‎05-18-2017
Location: US
Views: 1,617
Message 8 of 8

Re: T440 won't power on with bottom case on

We have a winner!, swapped out the whole LCD assembly and the laptop powers on just fine. Now to tear into the assembly and find out which cable it is.

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