Released June 2012, Model A1278. Intel processor with Turbo Boost, Up to 512 MB DDR5 Video RAM

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MacBook won't turn on. Magsafe adapter not charging, dim orange light.

I have a mid-2012 Macbook Pro (A1278).

Laptop was working fine two weeks ago. I recently tried to turn it on and there is no life in it. When I connect the magsafe charger the light is very dim and flickers orange. There is also a faint repetitive click coming from the jack.

I initially tried to reset the SMC and PRAM with no effect.

I have tried a replacement charger and battery and magsafe jack board, also with no luck.

Any suggestions would be very appreciated as I'm trying to avoid spending £250+ on a new logic board.

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1 Answer

Chosen Solution

A dim MagSafe Adapter LED implies the charging circuit on the logic board is having problems.

Did you get your system wet at some point? Something spilled into the keyboard/trackpad? Often the liquids short out the MOSFET's or corrode things up. Did you see any damage when you took the logic board out?

And lastly did you use proper ESD practices! In the winter the air gets very dry so static (Zap) can create issues like this.

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There have been no spillages near the laptop to my knowledge.

The board looked immaculate when I removed it, no damage anywhere.

I used an ESD mat and wrist band when dismantling the laptop.


Not good ;-{

You'll need to either find someone with the needed skills & tools to diagnose & repair the logic board or replace it.


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