Well, now it's a bit clearer but still how do I know if the signal goes in or out of that pin. I will explain an example of this question. In the first photo, you see a socket(1908). One of the pin is ground and other labeled "STBYLEDSUP". This plug is connected to "SPEAKER board" through the ribbon cable into another socket(1505). Now it seems that label changed from STBYLEDSUP to LED. I see it point away from that socket, so does that mean that the signal will go to somewhere with LED label? To be accurate I'm guessing that the signal will go to socket(1502) on the same speaker board. And on this socket, again, arrow but not pointing into a socket, so how do I understand that?
Also going back to 1908 socket. 1 and second photos are from wiring diagram. As I scrolled down I found circuit diagrams. In there I found the same 1908 socket(3rd photo). I see that STBYLEDSUP contains of two branches. So this is how I undestand all this situation. +12v and +5,6v comes to 1908 socket pin throug diodes and resistors(drop voltage I guess). Then, through flat cable it goes to 1505 socket. Then out of it through traces goes to 1502 and from there through couple of wires into actual LED??
The part which still confuses me is those arrows direction. In 1908 is points outwards, but in 1502 inwards. Also in 3rd photo in the right you see the same socket but some arrows are empty(not filled), and pointing out or in.
Adding one more photo whith various types of arrows that confuses me.