2015 MBPr Models, Question About External Video

[dukefawks]

It can also be the cable, have had that a few times so try that first. I didn't make the video BIOS, but somehow it needs to "see" an LCD to enable the external output.

 

[dukefawks]

And in most cases it IS liquid damage to the LCD. It runs down the LCD into the hinge cover and onto the PCB.