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

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MacBook will not power on when logic board is fitted to chassis

i just received a 2011 mbp13 2.3 i5 model, exhibiting no power whatsoever. not even magsafe when connected.

i pulled the logic board, cleaned thoroughly and added a new DC in board.

testing the new DC in board outside the chassis, i got (at first dim, and then full) green LED at the magsafe. i plugged in the fan, and sure enough the mac was powered on. i pulled the plug, reassembled the laptop, and there's no power whatsoever again.

then, lifting the logic board out while still connected to DCIN, i can power on the laptop. furthermore, i can place the logic board in the chassis and it remains on. if i pull the plug, i cannot restart the mac without removing the logic board.

if i remove, power on, then install the logic board, i can connect the battery and cables and begin to charge. i connected the keyboard, powered off the mac, and the magsafe remains orange. i make all the appropriate connections, and power the mac back on.

everything works, and i'm installing sierra.

the second i remove the magsafe, i'm back to square one and must remove the logic board to power it on again.

whaaaaaaaaat?

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i have taken my multimeter, and with the logic board and DC-IN board out of the chassis, i cannot locate any shorts between DC-IN and ground.

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with the logic board installed, i measure ~430ohm between 16.5VDC and any given ground point.

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my known good DCIN board was in fact faulty, shorting 0ohm between 16.5V and GND.

a second known good DCIN board fixed the issue.

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Did you happen to retest the possibly faulty logic board to see if in fact it was faulty or not?

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I was about to answer this with almost the same advice accept I was going to say if you replace the I/O board (power) board and it still continues to do the same thing it has to be grounding someplace else from the logic board. If you don’t have the equipment to test for this you could remove the logic board and make sure that there is something between any point where the logic board sits on a mounting point and is not metal to metal.

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Ronnoc Nailli será eternamente grato(a).
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