Macbook Air A1304 noob question

[dobrykamil]

Hi

I'm working on a bare 820-2375-A board and I'm still noob if it comes to mac logic boards repair, but slowly getting there.
Board doesn't power up when magsafe is connected, green light on the charger, all G3H and S5 rails are present. I does turns on when I bridge SMC_ONOFF_L pads. Is this normal behaviour for boards from 2008/2009?

Thanks in advance.

[mon2]

Re: Macbook Air A1304 noob question

Yes. It is normal on all such logic boards.

Apple / Foxconn has left these SMD pads onboard to mimic the on/off keypress that would originate from a working keyboard.

Often you will see the tech videos on youtube use tweezers to turn on the logic board.

Review your keyboard / cables / trackpad cabling if you find that the keyboard does not turn on the logic board yet this direct short does.

[piernov]

Re: Macbook Air A1304 noob question

MacBooks with NVidia MCP needs power button to be triggered in order to turn on.
Later Macs with Intel PCH turn on automatically when applying power after battery has been removed.

[dobrykamil]

Re: Macbook Air A1304 noob question

Thank you both for your replies. Info about nVidia MCP is very helpful!