I was upgrading the memory, SSD and optical drive (modded a blu-ray drive with the original upper shell from the SuperDrive) in a MacBook 2010 White Polycarbonate a1342 when I realized that one of the headers was...gone.
It turns out I may have accidentially broken it off, I think. So I took the cable and taped it somewhere else for the meantime.
The hader I think I have broken off is in the corner between the battery and optical drive. There are two very flat, slim headers with cables coming from - seemingly - the battery part, and they both plug in there. I somehow broke the other header, whilst not having even touched it after putting the plug back in (and it took me forever to do this with my fingers...). But when I was leaning back, I noticed that the bottom cable was loose again and when I tried to re-insert it, the corresponding header for it seemed to have disappeared.
I tried to find out what header it was, but unfortunately, all that shows up is the "Power on Pads" related topics and pinouts, with the MagSafe adapter included. But it does not tell me what header is on there, and if it is important or not.
After putting it together, I booted the laptop and it seemingly had no errors turning on. True, I have no OS on there right now but it still seems to be fine. The optical drive also seems to be powered and lets me insert stuff into it.
What do you think the broken header is, and how can I find it out? The cable seems to have two pins, whilst the other looks like having three. The 2-pin one has no socket anymore.
EDIT: I shared these pictures on Discord as I tried to get some additional help.
The now header-less plug: https://cdn.discordapp.com/attachments/516146586263486499/654435822631649290/IMG_0997.jpg