@flannelist @chrisgreen
Thanks for your answers! I made a better picture: https://ibb.co/s2HjHt4 and I found the schematics. I've attached them. It seems like the capacitor is used for the LAN port in some way. But would it be important to solder it on if I don't use that port?
Someone also sent me a picture from where to where I should solder on a jumper wire, is that correct?
[image|3511570]
[image|3511569]
[image|3511568]