Here you go.
Lots of orange wires out of the TV.
Thru the backboard to a 12 pin connector.
Out of the 12 pin they double back in themselves and hid in the black wire loom.
Chase that look into the backbox, and it's just a bundle of orange wires again.
Follow them around the backbox and the connect to J2.
I'd start by looking at J2 in the backbox and seeing if anything is plugged in there. If so it should be easy to fix