Chosen Solution
Hey all, My Macbook Pro (Mid 2012) has a problem. The screen is black when I boot it up, but when I plug it in to my external monitor it works. Things I tried: Reconnecting LVDS cablePRAM resetSMC resetDisconnecting the battery for a few minutes and reconnecting it again.Removed and re-inserted RAM sticks. I don’t know what I can do at the moment. Are there more things I can try or should I get a screen replacement?
Well the good news is the cable and the logic board connector are in good shape. I don’t see any broken pins or other physical damage. I assume you’ve reseated the connection and it still is not working. The bad news is you can still have a bad display or the logic board is damaged. Can you tell us a bit more on what happened before the display failed. Did the system get a bang or get wet? What does System Report show for the display under Graphics/Displays (it may not be listed). Also, I would run diagnostics to see if any errors popped. At this point I would use a spare display, carefully plugging it in to see if it worked. If it does that cinched it! If not the logic board output switching logic has problems.
The cable if probably dead or the connector is if there is no picture. The GPU might also be dead. If that is the case, get it to a shop with board repair or replace the screen cable/connector.
