2.26 or 2.4 GHz / White plastic unibody enclosure

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a1342 no startup but magsafe reacts

Sorry in advance for my poor English. Because i am from the Netherlands.

But my problem is that my macbook a1342 has no reaction other then after a smc reset the led on the magsafe reacts.

No fan turning on or a chime from the speakers.

The logicboard gets warm.

If anyone has an idea what this could be.

I would be very happy with an answer.

Thanks in advance!

Greetz from Bart.

Answered! View the answer I have this problem too

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Any liquid spilled on or around your macbook ?

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Tried a SafeBoot? Boot to CD/DVD?

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It had a liquid spill treatment. In a Macrepair center in Amsterdam.

But i guess they didn't check any capacitors or any other individual components.

Their answer simply was: replace the logicboard.

And here in the Netherlands that will cost you more than twice as much than a good used one complete Macbook.

I did TRY to check myself. But since i don't have any schematics that would be senseless.

The contacts at the magsafe and the battery have the correct voltage.

Safeboot wil not work. Because the Macbook does not react to anything other than a smc reset. No fans no chimes.

And i also try to boot without the battery.

I guess i need the schematics for the Macbook.

But thank you for the quick response.

I realy appreciate that.

Greetz Bart.

(not desperate yet)

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3 Answers

Chosen Solution

Please check capacitors and mosfets device for shorted or leak

Update

i don't know what the powerpads on the bottom or on the top but i have the image you want, i hope this will help you but this unibody i'v work is not exactly the same as your unibody but the symptoms is the same as your unibody.

Block Image

see the red circle? i used to switch ON w/o the keyboard

Update

see the green circle? i used this to turn ON w/o the keyboard. try to test w/ multi tester, see if you got 3v DC?

Block Image

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+ Good answer! Many people will not know how to test those or what they are. I guess, they might use Google to find out.

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This is not the same logicboard i have.

I have this one: http://guide-images.ifixit.net/igi/pYlV2...

It's from a a1342 late 2009 macbook unibody.

The pads i used are just above the left corner where the keyboard/topcase cable enters the logicboard and to the right of the trackpad cable. If there are any other pads, please let me know.

I found the schematics of the a1342 and for now i am going to study them. For the weekend i have the plans to measure the a1342 together with my brother in law because he has the proper equipment.

Thank you for your response.

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Disconnect the battery and try it without the battery installed.

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I measured the voltage on the powerpads.

It is 3,45 volt.

So this should be correct.

But the macbook won't startup by shortcutting them.

To be continued......

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try booting from the powerpads on the bottom or the top I forget that model it should be "pwr btn" and also if you have a fine usb microscope or good magnifier look for fractured solder joints before you start checking capacitors and mosfets , that usually gives me leads on what to test.

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I did try to use the powerpads on the bottom.

But i didn't know there were powerpads also at the top.

If someone could tell me exactly where they are or show a picture of them.

Then i could give it a try.

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Bart will be eternally grateful.
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