Why is it not turning on?

Hello guys, yesterday I wanted to clean the fans of my Late 2009 Macbook. As I finished cleaning it, I replugged in the Battery. But as I wanted to boot up my Macbook it just wouldn't. I don't know if it is related to the Battery because I had to instantly shut it down yesterday before cleaning the fans. I tried several times to plug it out and again plug it in but with no results. The L-Shaped Magsafe Adapter hasn't got any light either. As I press the Power button it simply doesn't power on. Not even the HDD or the fans boot up. Thanks in advance if you can help me.

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In my experience the keyboard ribbon is very short and a precision connection with not much "wiggle" room . If this cable is pulled accidently You will get this situation of no apparent power. Magsafe will show normal charge etc. but no boot.

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I have exactly the same situation. I found out that I disconnected a wire under the logic board and I fixed it by attaching the same wire to the charger port. It is now charging, however, It still does not power up despite the battery being full charged. I noticed that my ribbon cable was disconnected and it is very hard to put back in place. Could it be the cause of the macbook not powering up? If so, how do I put it back? Thank u

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Ege - How did you clean your fan?

Did you remove the battery first following this guide? Battery Removal using a plastic spudger.

Did you use can'ed air and a soft brush to scrub the fan blades and heat sink fins? And lightly scrub the logic board to loosen the dust? Did you unplug anything?

I suspect you may have knocked something loose or zap'ed your logic board (ESD or short) - Hopefully not.

Inspect the mag-safe contacts (both sides) and dirt or damage? Use some Isopropyl alcohol to wipe them down. I would also try a second mag-safe power adapter (is the cord worn, cut or bumpy?)

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First I unplugged the battery and the Fan and then I cleaned the fan with canned air. Could someone tell me where the cable of the power button is? BTW it was fully charged so even if the MagSafe would be broken it should still boot up via Battery.

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I agree the mag-safe board is not the issue here, I do wonder if you damaged something in the process of taking the fan out. Did you have a hard time unplugging the fan?

As to the power button it is connected via the ribbon cable to the logic board you can see in this picture.

Block Image

But, I don't think thats your problem either. I would look carefully around the fan to see if you crushed a wire in the fan harness (shorting). Are you sure you didn't disconnect anything else? Also did you use proper ESD practices?

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There are two solder pads (power pads) just over the top case connector to the left. If you have a multimeter settle it to dcv, apply the black prob to a logic board screw (for ground) and the red prob to any power pad. The AC adapter must be connected to the macbook and the battery disconnected. You should read 3.42 V on the right pad and 0v on the left pad. The macbook needs this voltage to start up coming from the SMC chip via the AC adapter or (and) the battery. If you have any other voltage, unplug the AC adapter, disconnect the top case ribbon cable, connect the AC adapter and take another reading of the power pads. If you get the 3.42 V briefly short the two power pads with a small flat screwdriver, that should power up the machine and indicate that the top case is shorted. If you get 0 V on the two pads then the power is not reaching the SMC.

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I have exactly the same situation. I found out that I disconnected a wire under the logic board and I fixed it by attaching the same wire to the charger port. It is now charging, however, It still does not power up despite the battery being full charged. I noticed that my ribbon cable was disconnected and it is very hard to put back in place. Could it be the cause of the macbook not powering up? If so, how do I put it back? Thank u

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The magsafe board probably broke. Try replacing it.

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