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yup, DC-IN board is most likely culprit. It is easily damaged (often when the power cord is tripped over while connected to the computer).
Was the connector your original AC adapter deformed or missing its tip?
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Yes, I've gone through several adapters due to bent and broken tips. Never understood why they couldn't build them with replaceable cords in a similar way that the 120v cord is designed.
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Are you in the habit of putting your laptop in a case with the charger plugged in? Surely you haven't tripped over your cord enough times to ruin "several" adapters...
It's not a good idea to put a computer in a case with anything plugged into it, as it can so easily damage the port or the logic board connections. In this case, as rab and David point out, something inside seems to have been broken.
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A1138 I have the same problem runs on battery but charger won't charge battery, purchased and changed dc board same thing, changed the battery connection to board with a working one, have to charge battery on another computer,,, is there something on the board bad? Computer not seeing charger. Have plenty of chargers
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