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Introduction

If you use a power adapter which is to weak for your Mac Book (e.g. 60W for a MBP 15" which is specified for a 80W power adapter) the following should happen from a theoretical point of view: The power adapter is overloaded and heats up until the internal thermal protection switches it off savely. -- And this happened in real live: The adapter blew up in a way, that it delivered one last powerful current pulse which also destroyed parts of the logic board. The Mac Book is still fully operational with battery, but can not be charged nor powered any more, even with a new power adapter.

The disassembling steps are referenced to MacBook Pro 15" Unibody Mid 2010 Logic Board Replacement. For this particular guide it is not necessary to unmount the fans, heatpipes and speaker-microphone-block. Just skip the related steps.

Since the topology of the circuit between power connector and battery is common technique, this guide might fit to other logic boards too.

  1. MacBook Pro 15" Logic Board's Power Input Circuit Repai, Lower Case: étape 1, image 1 de 1
    • Remove the following ten screws securing the lower case to the upper case:

    • Three 13.5 mm (14.1 mm) Phillips screws.

    • Seven 3 mm Phillips screws.

    • When removing these screws, note how they come out at a slight angle. They must be reinstalled the same way.

  2. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 2, image 1 de 1
    • Using both hands, lift the lower case near the vent to pop it off two clips securing it to the upper case.

    • Remove the lower case and set it aside.

  3. MacBook Pro 15" Logic Board's Power Input Circuit Repai, Logic Board: étape 3, image 1 de 1
    • Remove the three T6 Torx screws securing the right fan to the upper case.

  4. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 4, image 1 de 2 MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 4, image 2 de 2
    • Use the flat end of a spudger to pry the right fan connector up out of its socket on the logic board.

    • It is useful to twist the spudger axially from beneath the fan cable wires to release the connector.

    • Remove the right fan from the upper case.

  5. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 5, image 1 de 1
    • Use the flat end of a spudger to pry the AirPort / Bluetooth ribbon cable up off its socket on the logic board.

    • Fold the AirPort / Bluetooth ribbon cable back to keep it out of the way of the logic board.

  6. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 6, image 1 de 1
    • Disconnect the iSight cable by pulling its connector toward the optical drive opening.

  7. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 7, image 1 de 1
    • Use the flat end of a spudger to pry the optical drive cable connector up from the logic board.

    • Fold the optical drive cable back to keep it out of the way of the logic board.

  8. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 8, image 1 de 1
    • Carefully pull the subwoofer/right speaker cable up to lift its connector out of its socket on the logic board.

  9. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 9, image 1 de 1
    • Use the flat end of a spudger to pry the hard drive cable connector up out of its socket on the logic board.

  10. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 10, image 1 de 2 MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 10, image 2 de 2
    • Remove the two short Phillips screws securing the small EMI shield to the logic board.

    • Remove the EMI shield from the logic board.

  11. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 11, image 1 de 1
    • Use the flat end of a spudger to pry the trackpad cable connector up out of its socket on the logic board.

  12. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 12, image 1 de 2 MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 12, image 2 de 2
    • Use your fingernail to carefully flip up the keyboard ribbon cable retaining flap.

    • Make sure you are flipping up the retaining flap, not the socket itself.

    • Use the tip of a spudger to pull the keyboard ribbon cable straight out of its socket.

  13. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 13, image 1 de 1
    • Use the flat end of a spudger to pry the battery indicator cable connector up out of its socket on the logic board.

  14. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 14, image 1 de 3 MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 14, image 2 de 3 MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 14, image 3 de 3
    • Grab the plastic pull tab secured to the display data cable lock and rotate it toward the DC-In side of the computer.

    • Pull the display data cable straight out of its socket.

    • Do not pull the cable upward, as the socket is very fragile. Pull the cable parallel to the face of the logic board toward the corner of the upper case.

  15. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 15, image 1 de 2 MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 15, image 2 de 2
    • Use the tip of a spudger or your fingernail to flip up the retaining flap on the keyboard backlight ribbon cable socket.

    • Be sure you are prying up on the retaining flap, not the socket itself.

    • Pull the keyboard ribbon cable straight out of its socket.

  16. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 16, image 1 de 1
    • Remove the following screws:

    • Seven 3.3 mm T6 Torx screws securing the logic board to the upper case.

    • Two 8 mm T6 Torx screws securing the DC-In board to the upper case.

    • Do not remove the logic board yet! There are components on the underside of the logic board attached to the the upper case that must first be disconnected.

  17. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 17, image 1 de 1
    • Carefully lift the logic board assembly from the left side and work it out of the upper case, minding the port side that may get caught during removal.

    • Do not entirely remove the logic board yet!

  18. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 18, image 1 de 1
    • Lift the logic board enough to gain clearance and use a spudger to pry the microphone up off the upper case.

  19. MacBook Pro 15" Logic Board's Power Input Circuit Repai: étape 19, image 1 de 1
    • Slide the logic board away from the port openings and lift the assembly out of the upper case.

    • Before reinstalling the logic board, it is easiest to press the microphone down into its housing in the left speaker to keep it in place.

    • To avoid ESD damage, be sure to lay your logic board on a soft, static free surface during service.

  20. MacBook Pro 15" Logic Board's Power Input Circuit Repai, The schematic: étape 20, image 1 de 1
    • The picture shows a schematic which is similar to Mac Book Pro's power input circuit. The series components L1, F1, T1, T2 have to draw the full power, so those are of interest for us. With an ohmmeter you can check these parts.

    • L1: Since I could not figure out the manufacturer of this common mode choke I recommend to use a new MagSafe PCB.

    • F1: According to the printing on this part it is very likely that this is a Littelfuse 0469006 6A fuse.

    • T1, T2: Both MOSFETs are HAT1128R type. Since this part is obsolete I took IRF9317PbF

  21. MacBook Pro 15" Logic Board's Power Input Circuit Repai, Where are the parts?: étape 21, image 1 de 1
    • The picture shows where the relevant parts are placed on the logic board. F1, T1 and T2 are marked green. L1 is mounted on the MagSafe PCB and so not seen on the picture.

    • After you have figured out which of these parts (L1, F1, T2, T2) are defective you can change them. I recommend to replace both MOSFETs if there is at least one damaged.

    • After replacing the defective parts you can check the functionality by connecting the battery and the power adapter to the logic board. If everything is fine the LED of the MagSafe connector will light up green and switch to orange if battery will be charged. Be very careful.

Conclusion

To reassemble your device, follow the prerequisited guide in reverse order.

13 autres ont terminé cette réparation.

lemmirocketmotor

Membre depuis le 21/03/2015

426 Réputation

1 tutoriel rédigé

5 commentaires

I don't know if any 80w MagSafe. It should be 85w for 15" and 60w for 13"...

mamashannon4u - Réponse

Is there any chance you would be able to show the location of these parts if the same thing happened on a 2012 MacBook Pro Retina? I've been trying to find the information for a couple days now. Thank you

Nick - Réponse

Great post! Thank you!

chonghak Kim - Réponse

I can’t find T1 and T2. My board is little different from the picture . Mine’s 2011 or 12 i7 processor. Please help!

chonghak Kim - Réponse

Admirable ! and the pics can be enlarged a lot ! thank you!

Isaac OLEG - Réponse

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