Chosen Solution
Hello, a friend of mine gave me this unibody, the first one (late 2008) telling me it doesn’t power on. When i got it it started normally, i saw there where some screw missing, any way it worked fine, till one day o opend it and after close it wonted to start. Battery charged and magsafe led on, but nothing else. So i tried to open it back and try to put things better (cable, screws). It worked for months till yesterday when i removed tha battery for register the trackpad screw, i put the battery back and close, and now it won’t power on again. Please help! -_-
Get board view software for your particular board and check voltage on C7771. If it is around 0.3v, you need to replace the capacitor, it should be 1.05v. Common problem on this model, charger light will still work fine even with this issue. Replace it with a polymer capacitor (it is larger, so you have to rest it on another chip and run a wire to ground) to ensure the issue will not occur again.
