Let's just say I know nothing about electronics, so please bare with me on improper terminology.
I have a LCD screen that I have disassembled as I am trying to make a Touch screen mirror fit into a metal picture frame. The LCD included power adapter jack/plug is currently protruding from the back of the picture frame and therefor I would like to cut the cord on the power adapter end and solder the wires directly to the PCB (and the hot-glue to isolate).
It should be easy to cut the end of the power adapter and measure with a multi-meter which wire is positive, negative and ground.
However, I am having trouble finding which point on the PCB is which.
I have removed the plastic part of the jack on the PCB (image below) and was hoping this community could help me figure out which wire from the adapter should be soldered to which point on the PCB?
The large part of the image below shows the top where the plastic jack housing was. Once the jack was removed the PCB shows the markings 1,2,3 and a plus sign (the - on the large picture is the number 1 and not a minus sign). The number 3 is where the center pin from the powere adapter plug would go. Number 1 and 2 are touching.
Can anyone help me understand which is the positive, negative and ground on the PCB?
Here is a before picture before removing the plastic jack from the PCB: