Chosen Solution
Hi ! I have a Black 2006 Macbook (2.0 CD) that used to be working fine but since i changed the LCD unit yesterday i have i problem with it. When i plug in the Magsafe adapter, it starts automatically, without having to press the Power button, it just starts by it self as soon as it’s plugged… (even without any top case plugged) I tried the following :
- Reset SMC
- Reset PRAM
- Tried different top cases
- Changed Magsafe board
- Tried different Magasafes
- Tried unplugging almost everything on board All without success ! I am a bit clueless. If someone can help me out it would be greatly appreciated :) Thanks
Your 3 G_Hot rail is shorted out somewhere. This is a 3.3VDC voltage rail that is used for control on the motherboard. The jumper pads for this board are on this rail, thus when it has ground the system turns on. Take off your upper case (keyboard). Disconnect and deroute all the cables. Turn the laptop upside down and spray the logic board with canned air or gently shake the unit while it is upside down. Then carefully reroute all the cables in their proper path. Attach them to their sockets/headers, being sure they are properly and securely attached. Then give attaching the magsafe a try. If this doesn’t work, unhook everything but the fan and DC in board, then attach the power adapter. If it powers up in that configuration you know the problem is on the motherboard or DC in board. If it doesn’t power up then unattach the magsafe and attach a wire/cable, attach the power source. Keep doing that until you find the source of the problem.
In System Preferences->Energy saver Make sure “Start up after power failure” is not checked. Also check the Schedule settings.
