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Model A1502 / 2.6 GHz (Turbo Boost up to 3.1 GHz) or 2.8 GHz (Turbo Boost up to 3.3 GHz) dual-core Intel Core i7 processor with 4MB shared L3 cache.

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MacBook Pro won't turn on

Hello,

About a year ago my mid 2014 MacBook Pro stopped turning on seemingly out of nowhere. The only odd thing I noticed from first glance is that when I plug in the MagSafe cord, the light doesn't turn on. So far it has shown 0 signs of life (no fan sound, display off, etc). I haven't gotten around to fixing it until this week and here are the things I've tried to no avail:

  • Resetting the SMC (removable battery method from here)
  • Resetting the NVRAM (didn't do anything since mac can't boot in the first place)
  • Holding power button for 15 seconds
  • Swapping my MagSafe DC with my friend's, who has the same exact Mac model. My MagSafe DC worked perfectly fine on his Mac, but when I used his on mine, it made no difference.
  • Disconnecting the SSD and trying to power it on

I'm completely lost now and I'm unsure what to try next. A side note is that before my mac stopped turning on, my speakers stopped working.

Thanks in advance

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If the MageSafe LED is not lighting you need to try cleaning the MageSafe connector as it often collects dirt. Give it a good clean both the grey sides and the black bottom plastic areas, for the contacts get a fresh pink pencil eraser to scrub the contacts.

Did that work? If not you may need to replace the DC In-Board unit following this guide MacBook Pro 13" Retina Display Mid 2014 MagSafe DC-In Board Replacement did that fix things?

Lastly, if neither of these fixed the problem your logic board has an issue which will need deeper diagnostics.

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Thanks for responding. I’ve already tried cleaning and replacing the DC In-Board, but the LED still doesn’t light up. I have an identical MacBook Pro that still works (although it has a very cracked screen), so I’ll try swapping in it's logic board to see if that fixes it.

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Hi Dan, I'm back with some confusing results. To keep things simple, I'll call the MacBook Pro I'm trying to fix Mac 1 and the identical MacBook Pro I'm using for spare parts Mac 2.

Even though Mac 2 has a cracked screen, all its internal components are still functioning properly. Yesterday, I swapped the DC In-Boards between the two machines. Mac 1's DC In-Board worked perfectly in Mac 2, but Mac 1 still wouldn’t boot and showed no charging LED.

Today, I did the same swap with the logic boards. Again, Mac 2 worked fine with Mac 1's logic board, but Mac 1 still wouldn’t boot or show any charging LED.

Since it doesn’t seem to be an issue with the DC In-Board or the logic board, what would you recommend trying next? I’m completely stumped.

由完成的

@breadmaste90256 - is the case bent (distorted) around the MagSafe port? You could also run the system with the DC-In Board physically loose (not mounted) just make sure you don’t short things out.

由完成的

Nope, the case area around the MagSafe port seems completely fine. I also tried running the system with the DC-In Board physically loose just to make sure, but there's still no signs of life.

由完成的

@breadmaste90256 - then there is a short being caused between the logic board and the case. Double check your screws you may have put a long screw where a short one was required. Look at the board mount points comparing the two systems.

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