Lenovo T470s keyboard backlight not working.

[Andreasbest]

Hello.
I received a T470s today with no backlit on keyboard, tried multiple working keyboards but none lit up.
Tried bios reset, bios update, several key combination but nothing so i assume the keyboard backlit fuse is blown, problem is i don't know which one is.
Can you help me?

Thank you in advance!

[tomodachi]

Re: Lenovo T470s keyboard backlight not working.

Check F13 and F23, must be near trackpoint connector ( J37 )

[Andreasbest]

Re: Lenovo T470s keyboard backlight not working.

F13 and F23 are good

[rediii]

Re: Lenovo T470s keyboard backlight not working.

did you check for short on the rails, what voltages do you have there (pin10/11)? check the resistors on that lines (p. 58)