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Model A1286. Released February 2011 / 2.0, 2.2, or 2.3 GHz Quad-core Intel Core i7 Processor

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Not powering on. DC in board at fault?

Recently received this MBP which will not turn on using either battery, mains only or both.

Things I have tried:

  • SMC reset (no change)
  • Unplugged battery and used magsafe (no change)
  • Shorted the power pads (no change)
  • RAM taken out (no change)

When magsafe is connected it is a solid green bright light which never changes to orange. Pressing the BLI presents 5 flashes or green LEDs. Occasionally it flashes with only the first LED rapidly then goes back to the 5 flashes of LEDs.

Unplugging the battery and repeating this method, it is still flashes all LEDs 5 times. As the battery is disconnected I suspect it to be a problem with the DC in board. Took a closer look and to me it seems the board has had some sort of water damage? I was informed this unit had no water damage and none of the water indicators have been activated.

What do you think looking at the board? Am I on the right track to the fault?

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DC-in board seems fine, I can’t spot any burnt or charred component but there’s a nasty light reflected in the picture that makes it difficult to see clearly. However if there was liquid damage you would see oxide or darkened solder/metal parts, there’s maybe just some light solder flux left on the board, quite common on small parts. A green light and battery indicator working just confirm a good onewire circuit and probably a working SMC, there’s another 90% of the board where the fault may be, impossible to tell more than this without thorough testing.

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Is it possible for another area apart from the onewire circuit/SMC to not allow the battery to charge? I am looking to test some voltage readings but not sure where to start

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@rossco90 You said the machine doesn't start at all. There's plenty of critical rails beside onewire/SMC..there are about 2000 components on a board. Unless you can read schematics, it will take plenty of time before you can figure out where to start.

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Try this first.unplug the battery and mag-safe. Press and hold the power on button for ten seconds. Reconnect the battery and then the mag-safe. You should get a spontaneous re-boot.

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Tried this and nothing happens. When magsafe is plugged in you can hear a sort of faint electrical high pitch tone which changes pitch when the power button is held down.

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Review this Apple T/N Apple Portables: Troubleshooting MagSafe adapters Make sure the DC-In board contacts are not black! If they are then you do need to replace the DC-In board as well as get a real Apple MagSafe unit as the fake ones carbonize the contacts! Lacking safety features, cheap MacBook chargers create big sparks when the connectors are mated from the arcing Don't Replace Your MacBook Charger With a Cheap Knockoff

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