Chosen Solution
I have recently obtained an Early 2013 MBP 15-inch Retina, 2.4 / 8GB / 256 SSD. The person that donated the laptop informed me that she spilled some liquid into the machine and that it no longer works. Come to find out the machine boots and runs fine, display works through thunderbolt -> HDMI or HDMI port and LCD, however, there is no backlight. I checked the fuse labeled “P” below the right fan with a multimeter and I do have continuity. The liquid sensor is tripped under what I believe is the LVDS connector. Can anyone provide next steps for troubleshooting this bad boy? Thanks! Matt EDIT: Board is 820-3332-A
Of course there is no LVDS on this machine since it uses displayport, so no need to check a non-existent connector. Replace the LCD connector since pin 1 is burned, and make sure there is no short to ground when you plug the LCD cable back in. This didn’t happen on its own, you spilled something or replaced the screen so check for whatever caused this. Pin 1 of the LCD connector is the fuse on retinas, the fuse never blows. On 820-3787 they fixed this stupid $@$* but 820-3332 melts the LCD connector without fail every time.
