No Power after upper case repair

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MacBook Unibody A1278

13" aluminum unibody, 2.0 or 2.4 GHz Core 2 Duo processor.

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comps @comps

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Postado: 12 de dez de 2010

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No Power after upper case repair

I had spilled some liquid on a A1278 unibody MacBook 13". Immediatly shut off power and let it dry 2 days.

It did work fine but the keys on the keyboard got very sticky and it did not get better using them a lot. So I decided to clean the key board, but after taking it almost wholly apart, decided against that avenue and ordered a new upper case from ifixit.

So today I tried to exchange the upper case. It should be noted that I have the german version and of course I got an US upper case as spare part. After again taking it apart and putting everything in the new upper case, the thing won't start.

Battery is almost fully charged. MagSafe Adapter LED is green without battery inserted and orange once battery is put inside.

I tried the resetting thingy with 5s Power Press without any power attached (incl. battery taken out) and also the immediate PR-whatever reset with alt-cmd-p-r. To no avail - it won't start, just charge the battery.

Could it be that the US upper case won't work with the german logic board?

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More likely there's corrosion Depending upon the liquid, if not cleaned, the type & amount of time before corrosion takes place can be different. With a Mac if it fits, it works is the general rule. If the topcase were that different the connectors would be too.

12 de dez de 2010 por originalmachead

Well it works in the top case that had the liquid spill (only the keys are sticky), but not in the new one.

12 de dez de 2010 por comps

Can you test the battery in another computer?

12 de dez de 2010 por rab777hp

battery, power supply - everything works with the top case that I want to replace (it is just a pain in the $&^ to use a sticky keyboard).

However browsing through a lot of posts here I will try to replace the keyboard only and not the whole upper case.

12 de dez de 2010 por comps

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remacberlin @remacberlin

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Postado: 12 de dez de 2010

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The most likely culprit is the flatband cable connecting the keyboard/powerswitch assembly to the logic board. It's rather tricky to connect it correctly. I had lot's of fun with those.

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The broad cable just above the battery? Or do I have to do something with the thin cable at the bower switch below the subwoffer assembly/cable?

12 de dez de 2010 por comps

As I stated - the cable by the battery that connects to the LB. There is nothing you can do about the thin cable at the powerswitch itself, it's an integral part of the keyboard assy.

13 de dez de 2010 por remacberlin

Yes that was it, played around with it and it started to work. Thanks a lot.

15 de dez de 2010 por comps

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More likely there's corrosion Depending upon the liquid, if not cleaned, the type & amount of time before corrosion takes place can be different. With a Mac if it fits, it works is the general rule. If the topcase were that different the connectors would be too. — originalmachead
Well it works in the top case that had the liquid spill (only the keys are sticky), but not in the new one. — comps
battery, power supply - everything works with the top case that I want to replace (it is just a pain in the $&^ to use a sticky keyboard).

However browsing through a lot of posts here I will try to replace the keyboard only and not the whole upper case. — comps
The broad cable just above the battery? Or do I have to do something with the thin cable at the bower switch below the subwoffer assembly/cable? — comps
As I stated - the cable by the battery that connects to the LB. There is nothing you can do about the thin cable at the powerswitch itself, it's an integral part of the keyboard assy. — remacberlin
Yes that was it, played around with it and it started to work. Thanks a lot. — comps