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Early 2011 Model: A1278 / 2.3 GHz i5 or 2.7 GHz i7 processor

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Green Light Only - Battery not charging

Early 2011 MBP A1278 (820-2936) Getting only a green light on the charger.

OCLP 10.13.6 > 12.7.8 Monterey (OS running VERY smoothly)

I am 99% sure the DC In board is functioning OK (Tried another), no dirt, clean pins. SMC & PRAM Resets to no avail. Logic board is spotless, never water damaged, Charger is OK. I cannot see any blown components under the michaelscope. The battery is detected in Apples system profiler but it reports the battery is not charging. Coconut reports everything is fine & the battery IS charging! The battery charges OK in another same unit so 100% no battery issue. Any ideas on what I can try in case I missed something?

R7051?

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Love that michaelscope! Aka microscope.

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@danj oops, my spelling is sometimes a bit off... like yours ;) :P

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Turned out to be a just a poor connection / solder on the R7051

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The comparator logic likely messed up. There is two resistors the ISL chip measures to see the voltage applied and drawn. Luis Rossmann has a good vid on this you should check out. I'll need to dig for it when I get home.

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OK thanks, please add the link when you can :) R7051??

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@danj Bright Green light to suggest fully charged but it isn't charging. I am taking it to the menders today to check this R7051? as it looks suspect. https://www.youtube.com/watch?v=FGYrykiL... (7 minutes so...)

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If your Early 2011 MBP (A1278, 820-2936) shows only a green light and won’t charge, despite a good battery and DC-in board, check the charging circuit—especially the ISL6259 (charging IC) and related current-sense resistors (R7050, R7051). Verify PPBUS_G3H voltage (should be ~12.6V). If low, the ISL6259 or Q7055/Q7056 MOSFETs may be faulty. Inspect for corrosion or poor solder joints around the charger IC. Also, reseat the battery connector and inspect SMC signals (SMBUS_SMC_BSA_SCL/SDA). If all else checks out, replacing the ISL6259 or associated MOSFETs often resolves this issue.

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It was the R7051, we cleaned up that area before surgery and discovered it was wobbling (cracked solder joint) and a quick blast of the hot air fixed it very easy :)

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