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For some days now, I have a problem with my Lenovo Thinkpad T470p keyboard. Before all : I've already updated drivers and shutdown my computer.

Here are the problems :

  • The light of the caps lock key is like 50% lighted up in permanence (see the photo). Of course, before, the light was off.
  • When I hold the shift key and then press the space bar, it doesn't work.
  • When I hold the shift key, and then press letters, some append 2 letters. For example, pressing shift + B appends "BT", shift + T appends "BT", shift + Y appends "NY", shift + N appends "NY".

It seems to be the only keys that have a problem.

The caps lock key in its normal state (abnormally 50% lighted up):

Image: The caps lock key in its normal state (abnormally 50% lighted up)

The caps lock key in its uppercase state (normal 100% lighted up):

Image: The caps lock key in its uppercase state (normal 100% lighted up)

Have you an idea of what could be the problem?

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    Try booting into the UEFI/BIOS and see if the problem exists there: this will eliminate any OS-related problems, including any form of virus infection. – AFH Jun 24 '18 at 22:51
  • It doesn't seem so :l Light still light up. – secavfr Jun 26 '18 at 17:42
  • In that case, it's probably a hardware problem. Does that model have a removable battery? If so, shut down, remove the power plug and the battery, and leave completely unpowered for at least 30 seconds. This may clear any lingering hardware settings; otherwise, it's a repair job. – AFH Jun 26 '18 at 17:45
  • I've tried what you propose. Unfortunately, this seem to be a pure hardware problem... Thank you for your help anyway ! – secavfr Jun 26 '18 at 17:50
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After the advices given by @AFH :

Try booting into the UEFI/BIOS and see if the problem exists there: this will eliminate any OS-related problems, including any form of virus infection.

AND

Remove the power plug and the battery, and leave completely unpowered for at least 30 seconds.

... the fact is : it is a pure hardware problem with the keyboard.

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