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Can I diagnose SMC further?

Hey all, another Mac, another issue.

I just got this MacBook Air from someone who hasn’t touched it since 2015. As you can imagine, the battery’s all messed up.

Once in the U.S. again, I’m going to get a new battery. Here’s what’s odd though: when I connect the battery, the MagSafe lights up green (not horribly odd with a bad battery), but lights up amber with the battery disconnected. On every Mac I’ve ever worked with, MagSafe should ALWAYS be GREEN when the battery disconnects.

To conclude, I think this is an SMC issue. But, since this is a 2012 Mac, I can’t run Apple Diagnostics (I’ve tried every way possible). So, here’s me question: is there a way to check the SMC further? Because I would have to look at a new logic board at the point if the SMC is messed up, and not the battery (and I REALLY don’t want to replace it). Any thoughts on how to diagnose this thing would be great!

Thanks in advance!!

Here’s a couple of things:

Apple Diagnostics from internet:

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Apple Hardware Test that I downloaded from GutHub:

What’s odd enough, the Apple Hardware Test actually boots on other machines, just not this one… odd.

UPDATE: More pictures:

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CoconutBattery:

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I have a 2012 MBA A1466 same as this one currently in for repair (Been with the technician a month already), and we are able to do the apple diagnostics here (We get the Error Cannot Load EFI Drivers and there is an issue with the SMC on it..... how come you cannot do the diagnostics?

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@livfe - Yeah, the Cannot Load EFI Drivers is where I’m stuck. After conducting some research, this is some issue with the Mac’s firmware too old to connect to the diagnostics servers. And it won’t load locally either :(

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@jadonlyon But Apples diagnostics was where I got the EFI driver message from. We are going to replace the SMC and check 2 MOSFETS that feed the SMC (Replace the also) and then hopefully we can get it going again. Same issues as yours, see my other topic on Error Cannot Load EFI Drivers as @oldturkey03 was assisting also.

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@livfe - This is embarrassing, I’ve worked on Macs for over five years now, and I have no idea what the MOSFETS are :P

Could you explain what these thingies do?

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@jadonlyon Some kind of chip https://en.wikipedia.org/wiki/MOSFET @danj gave a few possible 'solutions' but as of yet the tech guy hasn't had time or whatever excuse as no update from them as yet..... we are on it though.

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@jadonlyon - If the El Capitan Diagnostics works then SMC’s microcontroller is working. There still could be a input issue which can even be the MagSafe chargers one wire comm within the MagSafe connection. I would clean the MagSafe socket so the dirt is not interfering with the contacts (clean the grey body area and the contacts). You may want to install CoconutBattery onto your boot drive as it will offer better info on what’s happening with the charger, battery and the charging logic on the logic board. As it’s polling SMC you also get another view on what’s happening, info is being passed by the batteries microcontroller like the batteries age and some of the power values.

The issue is within the Boot ROM EFI programming when Apple updated it, they never fixed it leaving you hanging! As the system was dropped a few years later and not many people realized the loss.

@livfe - SPI issues often stem around the SPI connector that is used during the manufacturing process and left on the logic board. Directly across from the battery connection on the other side of the logic board you’ll see it, just sitting there! The issue is being so close to the edge it’s not uncommon for a liquid spill to short out some of the contacts or solder pads. If it’s spoiled I just desolder it and retin the pads so they are not causing a short. It’s not needed and many newer systems don’t have it (still having the pads not the connector)

The three beeps is a memory issue and if you have a SPI problem it’s often likely the RAM chips have a bad connection as well here. Reflowing them will likely fix the RAM error or you’ll need to replace one or more of the chips. Again, look for spillage carefully run a dental pick between the pads and clean with IPA first sometimes that will fix things enough to pass POST. I would still reflow the chips to address a cold solder joint risk.

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@danj - Okay, that makes me feel better. I really didn’t think the SPI chip was broken. I’ve heard of this Diagnostics issue with 2011 and 2012 Macs. Now, since the Mac has been sitting lifeless for almost ten years now, I’ll clean all of those connections again. I’ll also upload screenshots of CoconutBattery.

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Way to much hassle for what the unit is worth to repair. (Always liquid spill or Coconut Battery).... no liquid spill and we all know about CB.... quite a different answer to the same issue Error Cannot Load EFI Drivers. The unit I have has so many issues that have developed and the cost and time. to fix it sadly far outweighs the value. (It also has a brand new LCD but it has a small crack that makes the clock area on the display white..... but that wouldn't be the cause any of these problems. The RAM beeps suddenly happened as before was only the EFI Driver error and refusal to fully boot and hang.

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@livfe - Go back and reread what I wrote I explained Apple broken diagnostics, then we progressed deeper into the problem you had.

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@jadonlyon - Well the battery is shot! We can see the age is over 12 years! The batteries chemistry only has about 5 years, the cycle count is well below the 1000 cycles. So we can deduce this system mostly continuously used on AC vs on the battery.


Lithium Ion batteries last longer when they get some exercise! And not too empty or to full for long periods of time. The more the battery sits in the middle third of charge is Nirvana.

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