The larger of Apple's MacBook Air laptops featuring dual microphones and 802.11ac Wi-Fi connectivity.

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DC IN Voltage Fails TechToolPro Diagnostic

I have a MacBook Air that sometimes doesn't startup at all.

So I ran the TechTool Pro 8 diagnostic on it and it has a sensor failure: DC In failed at 16.96v.

Does anyone know if there is a way I can fix this other than a new motherboard?

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3 Answers

Chosen Solution

The Mag-Safe is built into the I/O board. There does not seem to be a repair guide for this machine but there is one for the A1466 2012. Take a look: MacBook Air 13" Mid 2012 I/O Board Replacement

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I just replaced the part for a brand new one from IFIXIT and it didn't fix the problem.

I'm still get the DC-in Rail 0 Failed at 16.67 V.

Anybody else managed to fix it?


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You'll need to trace the voltage from the I/O board back to the main board as you have a disconnect along the pathway.


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I had the same issue and I fixed it by using the right charger. No more errors now!

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randy4 will be eternally grateful.
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