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

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MacBook takes hours to start charging - battery or IO board issue?

I've got a unique issue. My beloved laptop has started to not charge. I plug in the adaptor - it shows no light, and remains dead. However, if I leave it for a few hours, it'll start charging.

It's not a problem with the charger (I've tried 2, and they both work with a different laptop right away), and I've done an SMC reset.

I figure the issue could be either with the battery, or the left IO board. The battery condition is 'replace soon' - but other than that, is there any way to tell what is at fault? Doing a replacement is easy I just want to ensure I'm replacing the right part.

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You will need testing parts to use process of elimination and find out what is needed. Could be the battery (probably not cause for dim green light though), I/O board (liquid damage or worn charging port, try cleaning port) or I/O cable has liquid damaged pins. Check out the I/O cable and board, order the battery first (since that definitely has a fault), if there is still no charging light, order the I/O board (if the pins on the I/O cable look good).

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Really? You're getting a "battery condition is 'replace soon'" message, having charging issues and want to know what to do?

Maybe I'm getting to old and irascible to do this much longer. Maybe @sherlock_holmes can help with this one.

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Eliot Slevin will be eternally grateful.
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