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A business oriented laptop in Lenovo's ThinkPad line manufactured in 2011.

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Why laptop only turn on when l remove the LCD cable from M connector

My laptop only turn on when l remove the LCD connector from motherboard and it display to the second monitor nicely. What can be the problem?

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Elton are you saying that when you plug in the cable from the second monitor, your laptop screen stops working?

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No l am saying, when l plug the laptop LCD screen on the motherboard ( that's the built in screen) the laptop won't turn on, no power lights nothing.It will do like a dead laptop,but when l remove the LCD cable(rebbon) on the motherboard,the laptop turn on and l use my HDMI cable to display to the external Monitor.

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@ellomax

Hi Elton,

You haven't commented on the answer yet?

Mike

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Thank you Mike l will try to buy a new LCD screen becourse l insert the LCD connector for many times but nothing is working.

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@ellomax

Looks a fairly straight forward job so I expect you will have success. Let us all know how it goes.

It is always nice when there is a service manual easily available as a pdf on the web. Good points to Lenovo.

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If you are positive that the connector is connect correctly then you have a defective laptop screen which is shorting out the entire sytem so scrren must be replaced as so:

https://www.youtube.com/watch?v=MbkFwlrH...

or

https://support.lenovo.com/nz/en/solutio...

Make sure that the connector is attached firmly to the system board when installing.

The other possiblity is the BIOS needs to be reset but disconnecting the CMOS battery:

https://support.lenovo.com/us/en/videos/...

This is unlikely though as it works fine with the internal screen disconnected and connected to external monitor. But hey worth a try.

The hardware maintenance manual might help:

https://download.lenovo.com/ibmdl/pub/pc...

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