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In June 2017 Apple updated its 13" MacBook Air with a newer Broadwell Intel Core i5 processor, resulting in slightly increased performance and battery life.

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Faulty board component replacement

I have a 2017 13” MBA that will not power on. Visual inspection shows no liquid damage, and the liquid indicators are still white. There is a component, R40G L27F, that seems to have leaked its contents onto itself, but not onto the MLB. I haven’t been able to find this part by the code. Is this likely what the problem is?

I’ve also checked the I/O board, and it doesn’t seem to have blown a fuse, at least by sighting it alone.

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This is a induction coil nothing liquid inside. The shell is compressed Iron dust what you are seeing is rust!

The liquid markers don’t always tell if the system was wet and in many cases I’ve seen condensation being the cause.

People forget when they are in a humid climate and they exit a nicely cooled office or home the cooler surfaces will act as a magnet pulling the moisture out of the air! Just like a cold can of soda sweating!

So… Lets see if we can figure things out. What is the color of the MagSafe plug Amber or Green?

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MagSafe plug goes green, regardless of whether the battery is connected. There doesn't seem to be any burning around the fuses on the I/O board either, so I think I can rule that out.

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@jaknz - If you had disconnected the battery and plugged in the MagSafe alone the LED should have gone to Amber. This points to a logic board issue for sure,

Time to fully remove it and make a detailed inspection. Often I see the back side has gotten wet. Use a good magnifier (board inspection microscope) to review the board.

There will likely be a point you'll need access to the schematics and board view drawings to trace out the power rails if you don't see anything visually.

This might be a good point to stop and if you have someone local who has deeper skills or look for a replacement logic board.

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That's the point where it's probably beyond my ability to diagnose and repair, but I do have a repair shop I've used before that does MLB repairs. I'll probably end up just taking it to him to check. Thanks for your help!

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