What is the function of the white and blue cables inside the phone?

I have a Samsung Galaxy Note 5 (SM-N920P). I recently replaced the digitizer. In the process, as I was removing the cables connecting the motherboard to the daughterboard, the port on the motherboard that the white cable connects to separated from the motherboard. I have everything back together, minus being able to connect that cable, but everything seems to be working except for the S-Pen. I have Wi-Fi, I have mobile signal, I have speaker, microphone... What is that connection for? Is it just to track the movement and functions of the S-Pen? I tried to buy another motherboard, but it was FRP locked so I'm trying to see if I can just use it as is. Seems as though I can right now, but I just wanted to make sure my phone wasn’t going to suffer a worse fate down the road if I continued to use it this way.

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