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Aktualisierte Version des Retina MacBook 2016. Modell A1534, EMC 3099. Jetzt mit schnelleren Kaby Lake Prozessoren bis zu 1,4 GHz Core i7 mit Turbo Boost bis zu 3,6 GHz und bis zu 50 Prozent schnellerer SSD und unterstützt bis zu doppelt so viel Speicher.

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Diagnosing an EC 3099 that isn't turning on

Hi everyone,

I have an A1534 EC 3099 that doesn't turn on. It was given to me by my friend, since they couldn't use it in this state.

I have repaired phones before, but nothing more than replacing the display/battery/charging port - so nothing that required micro-soldering. The repair shop quotes $200 for the repair.

I have used the iFixit guide to open it. The charging connector seems clean, so the that shouldn't cause the issue, but on the other side of the logic board, there seems to be a blown part labeled R22.

I've managed to find 10pcs of R22 on AliExpress for $6, but I only have basic tools, like a simple soldering station.

So my questions are:

  1. Should I tunnel vision on the blown R22? If yes, what else do I need to replace it? I've read I need a smaller soldering iron tip, a soldering flux and a microscope (I do have that, not a professional one or anything, but it works). I do not have a hot air station.
  2. Is there anything else I should diagnose? The multimeter says 5V 0A, so it's not turning on I guess.

If you'd suggest a completely different approach, please do let me know.

Thank you!

Edit: Adding pictures

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@dotmiracle post some pictures of your complete board and mark the location of the component. That way we can probably identify what it is and if, and how it is even connected to your issue. Bilder zu einer vorhandenen Frage hinzufügen


@oldturkey03 I have added the requested pictures. Thank you!


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If you've inspected the rest of the interior of the machine and it all looks good then it sounds like you've found the issue. I'm not confident in my ability to replace components on these boards so I would recommend just replacing the logic board, but if you're confident in your ability to remove and replace that component then you could give it a go and see what happens! Good luck!

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The inductor (marked R22) overheated as the MOSFET VRM chip logic which is behind it has likely failed. This design uses four VRMs to manage the voltage going to the CPU module.

You can also effect things by over loading the systems ability to process. As an example compiling sizable videos, or very heavy game play.

You’ve likely heard of horses being spooked running until they run them selves to death! This sometimes happens with race horses and dogs. Basically you system can also face this same risk.

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Thank you! So are you suggesting replacing the R22 would potentially fix the problem?


@dotmiracle - It really needs deeper diagnostics.

While you do need to replace the inductor you may need to replace the MOSFET chip just behind it. This MOSFET is similar to a bridge rectifier. Think of four diodes so the AC enters North an South and the sawtooth DC output is East and West. What would happen if one diode is shorted out the bit of the AC power would sneak in. This can then cook the down stream logic.

A MOSFET setup offers a smoother conversion of the sawtooth DC power feeding into the CPU and as it’s also running at a lower voltage than the rest of the system but can draw more current which is why laptops need them too.

Here’s a good read on VRMs Guide To Motherboard VRMs - The Secret To CPU Overclocking


Thank you again. How would I find the MOSFET chip that might need replacing? Cause I'm getting all the things I need for this repair (hoping it's not a dead CPU).


@dotmiracle - Replacing the VRM chip will take a hot air rework station and to find the needed parts you’ll need to review the schematic and board-view drawings. Sadly, I don’t have this systems to offer even the data from it. You can also search for the chip using the markings on the chip, it’s a standard part. But without the proper tools and techniques you could end up damaging your logic board to the point of not being repairable.

I would recommend to locate a junker so you can both practice on as well as acquire the parts from it.


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dotmiracle wird auf ewig dankbar sein.

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