Logic Board won't power up; where to start?
I buy broken MacBooks and try to refurbish them. I don't do it to make money, really, but more of a hobby. If I can repair one to working condition and make a profit, great, but I certainly don't buy a machine with the assumption it will be an "easy fix".
That being said, I have a number of these 2009/2010 MacBook Unibody (model A1342) machines that have had various issues (liquid spills, no power, etc). I've gotten to a point with a few of them where I simply cannot find any problem with them. I've tested the top case/power buttons to ensure their functionality. I've checked over the logic board with a fine-tooth comb and have found no signs of liquid damage or burning. I cannot get the board(s) to power on even with a manual jump (using a known-good magsafe board and known-good charger). All boards receive power fine (and all will even charge batteries when attached). They simply won't power on.
My question (after all of that backstory) is: Where should I go from here? I could of course take a known-working logic board and compare/test each component with my volt meter, but with 10+ boards that would take a while. Is there a particular part of the circuitry I could start with--perhaps a "power on" circuit? Is there some main power fuse or gateway that I should check after confirming the top case and DC-in board are working fine? Is there anything obvious that I could be overlooking (something similar to not having the top case ribbon cable unplugged, etc)? I realize that sometimes the logic board can just be "dead", but certainly there's always some particular cause for failure (even if I can't identify is visually).
If I failed to provide any pertinent information, feel free to let me know! Also, if there's someone who specializes in troubleshooting this particular model, I'd love to pick your brain about a few things (in general) regarding the A1342 via email. Let me know! Thanks in advance for any replies.
この質問は役に立ちましたか?
1件のコメント
I’ve found this helpful. I was helping out my mother reorganize recently and stumbled appon her, as she said, “fried Mac”. 2010 MacBook A1342. We talked about it and we both recalled the day she dumped her water on the face of the keyboard... Memories flooded in as I remembered the time and hassle she went though with Apple as they targeted just about everything else without any luck. That was 2012. This thing is practically “new”. It wouldn’t start. So I tried out the “jump start” method. *angelical Mac sound*... 2secs later, crashed. So I went to the ram and pulled them out, flipped them around, jumped it. It was now booting up and never got to the login screen. Jumped again, now going to press shift+c... Right as I pressed shift, it crashed. After testing other keys it seems to be random ones that does it. I’m contomplating replacing the keyboard or full upper case.
My question is why? Why does the keyboard cause this common problem for people??
Scarlett Brophy さんによる