Lenovo Thinkpad Keyboard T440 T440p E440 E431 T431s L440 T440s Backlit Model everithing work on L440 except backlit!, because the mobo not suppoort it! i will try to making modification with 5volt and touch button Its working directly, that touch button are neccesary! Pinout UPDATE 5/10/22 i use this touch sensor controller from Aliexpres Pinout Article Link Smart Home Touch Sensor Button Dimmable Controller 19mm Switch for DC5V 12V 24V Smart Home Led Tape LED Dimmer Controller|Switches| - AliExpress so you can put it if you are not interested in putting the sensor on it, which will say working without a switch. I put hot silicone to hold the piece of copper , It is mandatory to replace the yellow cable and put enameled headphone cable, thus reducing its high sensitivity In this part I reduced the length of the cable so that the coil on the upper right would not obstruct the keyboard input. It was so messy, you can order it as you like, even use very fine cable for it.
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