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Old Mar 10th, 2009, 04:39 PM   #1
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Question Techies - signs of a dead logic board?

Here's the computer:

MacBook (13-inch), white, intel core duo 2GHz, 1GB RAM, 160GB HD.

Here are the symptoms:
  • with A/C plugged in, and a good battery in, when I press the power button, no sounds or chimes, just the white power light comes on.
  • With A/C UNPLUGGED, and a good battery in, nothing. Absolutely no life.
  • Will not charge battery when plugged in
  • battery is good - charged it in another MacBook
  • A/C adaptor looks good - no signs of wear - get the typical green light, then orange light when I connect it. One caveat - sometimes, but not all the time, the green light will flash once quickly then turn to green then orange.
  • RAM is OK - tested in another MacBook
  • HD is OK - scanned it with Drive Genius and also put a known good HD in this faulty MacBook and got the same symptoms

Also tried resetting PRAM, PMU, but can't even get to start booting.
I do lots of my own repairs - took off the upper case and keyboard and the logic board looks great. no signs of damage. in fact looks better than any other I've seen.

Are these signs of the logic board being randomly fried?

any ideas for a source of a cheap replacement?

thnx
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Old Mar 10th, 2009, 11:17 PM   #2
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There are no cheap replacement boards for the macbooks. I also need one for a 2GHZ core2duo and can't find nothing under $300 USD plus shipping for a used board.

If you could have a known working board to try it in your macbook case then you would know if the mobo is the problem. It seems to be a motherboard issue but Lars would be the good guy to give a diagnostic on your case.
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Old Mar 11th, 2009, 09:37 AM   #3
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It sounds like a defective logic board. I would have suggested perhaps a defective MagSafe board, but the fact that the white light comes on in the front, despite no video, suggests the unit is getting adequate power, and therefore rules out the MagSafe board as a possible problem.

Unfortunately, as GlassOnion has pointed out, replacement logic boards (including used ones) are no where near cheap.
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Old Mar 11th, 2009, 01:43 PM   #4
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This sounds like what resently happened to one of my teachers, in his case it wasn't the logic board but the solder connection between the charger and the logic board. But maybe based on lars' answer I am wrong
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Old Mar 11th, 2009, 07:57 PM   #5
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Quote:
Originally Posted by sae View Post
This sounds like what resently happened to one of my teachers, in his case it wasn't the logic board but the solder connection between the charger and the logic board. But maybe based on lars' answer I am wrong
No such thing. The battery charge board is not soldered to the logic board.
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Old Mar 12th, 2009, 07:52 AM   #6
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Quote:
Originally Posted by sae View Post
This sounds like what resently happened to one of my teachers, in his case it wasn't the logic board but the solder connection between the charger and the logic board.
He's talking about the MagSafe board connected via a socket to the logic board.
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Old Mar 12th, 2009, 09:59 AM   #7
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Worth checking the MagSafe board.

If I'm not mistaken though, if the MagSafe board (same as DC in board?) was suspect, then I wouldn't be getting any lights on the A/C connector (power adaptor).

What about the connection between the battery and the logic board. Would that be causing these problems?
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Old Mar 12th, 2009, 12:04 PM   #8
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mine wouldn't turn on if the battery wasn't plugged. white led turns on but nothing.

i'd try again once home..
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Old Mar 12th, 2009, 07:05 PM   #9
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Quote:
Originally Posted by hdh607 View Post
What about the connection between the battery and the logic board. Would that be causing these problems?
The battery board connects the battery to the motherboard and has the sleep module integrated in it. It's a $20 part on ebay so you may replace it and cross your fingers...but I would not count on it.
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Old Mar 12th, 2009, 08:39 PM   #10
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Just replaced the battery connector with a good one from another MacBook I have. No luck - still no life, just the white LED light.

I'm wondering if its worth doing the same with the MagSafe DC-in board...
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