Where is the hall switch sensor in T420S?

[sguerrini97]

Hello, I was looking for a place to ask for help abount my T420S and I just found this community
So recently my T420s LCD & keyboard stopped working while external VGA monitor & USB keyboard was working fine, I figured out that it was thinking that the lid was cosed. I read somewhere that the hall switch sensor is in the cable that connect the activity indicator leds, the webcam and the microphone to the motherboard and infact I can use the laptop with no problem when I unplug that cable from the motherboard.
Now I don't care about the lid switch since I can suspend the laptop manually, but without the whole cable I can't use the webcam and the leds showing power state/hdd activity aren't working.

What I would like to do is to remove ONLY the lid sensor, does anyone know where exactly is the hall switch sensor inside the cable? Thanks and sorry for my english.

[RealBlackStuff]

https://support.lenovo.com/us/en/documents/pd009627
https://support.lenovo.com/us/en/documents/pd010768

[sguerrini97]

https://support.lenovo.com/us/en/documents/pd009627
https://support.lenovo.com/us/en/documents/pd010768

I've read the manual, am I getting it wrong or it says that everything is inside the same PCB?
But if I disconnect the webcam PCB from the cable (leaving the other end of the cable connected to the motherboard with the activity leds as well) I still experience the issue..

[RealBlackStuff]

The hall switch is activated by a magnet.
This may be placed either in the LCD-bezel or somewhere under the palmrest or KB-bezel.
In the T420s case it's probably under the palmrest, near the front, same/similar as in T430s.
Here's about that T430s: https://forums.lenovo.com/t5/ThinkPad-T ... -p/1741111