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MacBook Pro internal screen doesn't work but an external monitor works

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 cable
  • PRAM reset
  • SMC reset
  • Disconnecting 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?

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Shine a flashlight through the Apple logo in the lid are you able to see your desktop and the icons?

Hey Dan,

Thanks for your quick reply. No, I don't see any icons or my desktop.

Turn off the system and disconnect the LVDS cable take a picture of both the cable (both sides) and the logic board so we can see the connections as I'm suspecting there's some damage Adding images to an existing question

I added some pictures. I hope this will give us an answer.

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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.

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Hey Dan,

Thanks for your response. The laptop got dropped and after that I didn't got any video on my screen. Under the tab "Graphics/Displays" I only saw my external monitor. I will run a diagnostic test later today and I will let you know the results.

I tried to run the diagnostic test, but I got an error. It said: Cannot load "EFI/Drivers/TestSupport.EFI/". What should I do?

You'll need to patch your diagnostics to fix it Fixing Apple Hardware Test (AHT)

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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.

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The 13" MacBook Pro's don't use a dedicated GPU the built-in graphics engine within the CPU is used. Besides an external monitor works so that rules that out.

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