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RobJ2007
What's DOS?
Posts: 2
Registered: ‎01-18-2018
Location: CA
Views: 540
Message 1 of 3

T400 Screen is black and only works if connected to external monitor

Hi,

Maybe somebody can help me with this.

 

Today when I turned on my T400 the LDC screen went black after starting windows. I can see the booting messages but when starts loading windows 7 (displays the windows logo) the LDC screen in the laptop goes black.

 

If I connect a external monitor directly to the laptop, LDC starts displaying.

Even if the monitor the monitor does not have any display the LDC is working.

If I change the settings to display in boths. Both screens work.

 

I made all possible combinations and everytime if I disconnecte the external monitor the screen goes black.

I used a dock station and it does not work. LDC and monitor (connected to dock station) were black. If I connect the monitor directly to the laptop the dock station and the LDC worked fine.

 

So display in dock station and LDC only work is an external monitor is directly connected to the laptop.

 

Any idea why this is happening or have a similar problem?

Thank you,

Rob

 

Guru
Posts: 766
Registered: ‎07-24-2013
Location: AU
Views: 515
Message 2 of 3

Re: T400 Screen is black and only works if connected to external monitor

It's a long shot but maybe Windows is trying to set a resolution higher than supported by the internal screen?

 

It would explain why it works with external screen as long as it would force a duplicate screen mode with different resolution supported by both screens.

 

Try to start your laptop in low resolution mode:

https://www.digitalcitizen.life/4-ways-boot-safe-mode-windows-10

====================================
I'm an INsider - not a Lenovo employee.
You can find me in gaming, Ideapad and Thinkpad forums most of the time.
RobJ2007
What's DOS?
Posts: 2
Registered: ‎01-18-2018
Location: CA
Views: 504
Message 3 of 3

Re: T400 Screen is black and only works if connected to external monitor

I will try that.
Thank you

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