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TFerrante
What's DOS?
Posts: 2
Registered: ‎06-30-2015
Location: Boston, MA
Views: 187
Message 1 of 4

Thinkpad T420S Keyboard and Monitor Failure

Recently the Monitor on my T420S failed.  Following online message boards, I hooked up the computer to an external monitor and verified that the graphics card was ok as I was able to see the screen, but when attempting to type, I recognized that the keyboard was no longer functioning.  Thinking that it was still related to the monitor, I purchased a replacement... but to my suprise, both the keyboard and monitor are still not functioning.  With the new monitor I could see the startup screen with a light placed on the screen, but the keyboard shows no response at all.   Good news is that I am able to remote into the machine so all the data can be transferred, but I would hate to lose such a great laptop that has been so good to me over the years.

 

Any thoughts on what the issue might be?  Has the motherboard possibly failed?  Open to any and all suggestions.

Retired Support Specialist
Posts: 3,015
Registered: ‎03-14-2014
Location: Bangalore
Views: 161
Message 2 of 4

Re: Thinkpad T420S Keyboard and Monitor Failure

Hi TFerrante,

 

Welcome to Lenovo Community!

 

I am not sure about the system board, before confirming on that can you just try with reseating the both LCD cable and Keyboard cable.

 

I am little bit confused about the statement given (With the new monitor I could see the startup screen with a light placed on the screen), can you elaborate this or else provide the snapshot, so that we can verify the issue.

 

LCD UNIT REMOVAL - THINKPAD T420S

KEYBOARD REMOVAL AND INSTALLATION - THINKPAD T420S

 

Hope this helps.

 

Best regards,

Hemanth Kumar



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TFerrante
What's DOS?
Posts: 2
Registered: ‎06-30-2015
Location: Boston, MA
Views: 151
Message 3 of 4

Re: Thinkpad T420S Keyboard and Monitor Failure

Sorry for not being clearer. The new monitor installed does not have a back light. The only way to see anything on the screen is to shine a light onto it.

I have removed and replaced the cables to both the monitor and keyboard but they are both still not functioning. Only way to have access to the computer at this point is via Remote Desktop or external monitor and keyboard. Searching all posts online I have yet to find someone where both failed at the same time.

I have run hardware scans and all have passed. Don't know where to look next.

Retired Support Specialist
Posts: 3,015
Registered: ‎03-14-2014
Location: Bangalore
Views: 136
Message 4 of 4

Re: Thinkpad T420S Keyboard and Monitor Failure

Hi TFerrante,

 

In this situation I would have visited Lenovo authorized service center. This hardware might be with system board or with individual parts, request you to get it checked with service center only.

 

Please click here to visit the link where you can get the list of support contact numbers, select the respective region and give a call.

 

Hope this helps.

 

Best regards,

Hemanth Kumar



Did someone help you today? Press the star on the left to thank them with a Kudo!
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.

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