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

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USB devices not working - bad logic board?

I have 3 macbooks with various degrees of liquid damage. 2 are a question for another day. Each was "spilled" on quite some time ago; maybe as long as a year.

Wives and daughters and macbooks don't mix.

The one I'm interested in is a MBP 13 inch unibody early 2011.

Started by reading your liquid spill/cleanup guide.

Took the machine apart - removed the logic board - cleaned any and all signs of corrosion with isopropyl - dried and reassembled.

Machine powers on, boots up, loads OS. But I can't go further because internal keyboard and trackpad are not working.

Now we get down to my question. An external USB keyboard and/or mouse do NOT work either. I can replace the internal keyboard relatively cheaply ($25 on Amazon) - but - is the fact that the external USB devices are NOT working a sign there's probably some wrong with the logic board?

It's a no-brainer to throw $25 bucks at it for a fix - but a new logic board will run me 10x that. Not sure it's worth it in that case.

Thanks!

Answer this question I have this problem too

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Hmm then this could actually be some software issue dose anything work on the usb or internal keyboard that make it show it has any life for example a caps lock ? Dose the internal or external keyboard work on startup can you get into recovery with COMMAND+R ? I would also try a Pram reset as-well. https://support.apple.com/en-gb/HT204063

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No, the internal keyboard is not functional in any way. Caps lock doesn't work - power button doesn't work.

And no resets of any kind are possible because external USB devices - keyboard, mouse, whatever, are not functional either. Not at startup - not anytime.

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ah okay it seems that it could well be a logic board issue i cant usally diagnose things without looking at them @danj or @mayer might be able to help you

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Boy this is a tough call! So is the external USB ports power bad or is the internal & external USB connections not working (from the liquid damage).

The easiest thing here is seeing if the USB port is even offering power. While I have one of these you may need to get one which it s good investment! USB Mini Voltmeter. See if that offers a clue.

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