This is a Samsung n102 notebook. 2 contacts to the single ring contact
in the chassis socket. So the small one presumably an insertion switch
,for whatever reason, and the other for current.
In the process of bending the arm wiht a needle, the contact end , at
the open end of the socket, sprung out from behind the lip. Luckily
while bending out while pressing down on the tip to try and get it back
in , it reinserted behind the lip. So next time , while bending the arm
radially inwards, hold the tip in wiht a jeweller screwdriver blade.
Leaves what is the function of this switch, just enables/disables the 2
colour charging LED and display light level setting ? locks out the
inboard charging after an unknown time after loss of switch contact for
some unknown reason?
I never thought to check the pc battery charge gizmo, just noticed the
LED going on and off and display backlight dipping/brightening.