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Why do I have intermittent battery charging?

I've had multiple issues with charging this MBA. After replacing the battery, (which checks out okay with Coconut scan) I've had a few different results when connecting the MagSafe (genuine Apple adapter). At first the light on the charger wouldn't come on but the battery would charge fully. The light would occasionally turn Amber but never seemed to stay lit. It would even turn green when fully battery was fully charged. I thought it might be a bad charger but I tested a different charger and got same result.

I swapped out the power board but that gave me a worst result. The battery would not charge but the MBA would run on the charger (no lights). I re-installed the original power board but ended up with the same result as the new power board, not charging the battery but working from the charger. With the battery still holding 70% I shut the MBA down and left it connected to the charger ( no lights on). I came back a few hours later to find a bright green light on the charger and a fully charged battery.

I've tried resetting the SMC and PRAM.

Does this sound like a bad power control module on the motherboard? Could it be a bad flex cable?

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It was a bad i/o flex cable. Replaced it and it works fine.

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I forgo to ask if the light on the magsafe was coming on. Terrible advice in my last post. Glad to hear you solved it!

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Maybe a stupid question. Think this might be a similar culprit for my Lenovo with similar symptoms? Intermittent charging, runs on AC only so charger good, battery has 80% life left according to "battery info view".

Time to crack 'er open?

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The battery is not fully compatible. Get an Apple battery. That should resolve this issue. Or get replacement battery that the manufacturer guarantees compatible. Get one from here returning the old one to its seller. Hope it helps.

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The replacement battery I installed was a genuine Apple battery.

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I just compared the two batteries. The one I pulled was a 020-7376-A for a 2011 MBA 11". The new one is 020-7377-A for this 2012.

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Same old $@$*, check R7020, R7021, R7022, R7050, R7051, R7052, and traces between all these resistors and U7000.

Extra credit to anyone who can use their brain and tell me why I am suggesting this instead of blindly monkey-see-monkey-do linking to another thread stating that since x worked for someone else's problem it'll work for this guy's. Thinking is good, it engages brains!

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TimC 将永远感激不已
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