How do I troubleshoot Logic Board?
Here is a brief history of my issue: One day after moving my laptop to a remote recording location, I returned home to find it unable to boot. The front LED would turn on, the drive would sound like it was booting and then it would turn off. When holding the button in, the light would blink for a few seconds. I took it to the Apple Store. They said it was probably the logic board. I asked why it would decide to just fail completely out of nowhere. He had no answer. I came home that night... tried to boot again for fun... and funny thing, it booted perfectly. Few weeks later the same issue happend. Kept trying it and it worked. Eventually it stopped.
There is no logical explanation for my logic board to fail. I'm able to charge my battery and get a solid green light on my adapter. I've tried reseating the RAM, PRAM, SMC, etc. etc.
I found "lemerise"'s very helpful tips about jumping the power pads to troubleshoot the top case. I removed the airport card, hard drive, optical drive and data cable and tried this. When I plugged in the power, the light was very very faint green. When I jumped the power pads it started blinking green and amber. I'm just curious as to what this means and where to go next? Why do I get a solid green light when the case is on but not when its removed? Any advice short of "take it to teh apple store lol buy apple care" would be greatly appreciated.
Is this a good question?
9 Comments
Did you take out the I/O board? I've had the green/orange blinking before, but it was while testing an I/O board that wasn't seated correctly and shorting.
by Josh Douglas
Not sure what I did but I got rid of the blinking amber light. Now when I jump the pads I can see the fans starting up and when the optical drive is in it makes a sound but then the fans stop. So it doesn't look like the top case is the issue unfortunately. I guess thats the end of the line...
by nah
Actually I was just getting that light because I don't think I was jumping it properly. I just would really like to know as technical an explanation as anyone can offer how my board is "dead" when its definitely trying to power up..its acting like its just losing power before it can fully boot. It can still charge a battery...the front LED and fans still work
by nah
I found that when I disconnect the Express Card port I get no light on the indicator on the power adapter. It also fails to even do the fake "start up." Is this normal? Also could the fans be a culprit?
by nah
Hi guys, I just found this awesome website, and came across this conversation. This is EXACTLY the problem I am having with my mac, Same model and everything (A1260) Same symptoms. Mark I was hoping that you could tell me exactly what you did to yours so that I could try it?? I've been trying to do what mayer and abcellers as well, but so far no luck. Have you been able to find out what it was?? Left I/O board or cable, magport connection (my adapter is 6mo. old), battey cable or connection? I would greatly appriciate the help guys. Sorry if I did this wrong, like I said I just found this site, and I like it alot. I just don't know how to use it yet. Anyways thanks in advance. And again same exact symptoms as mark.
Thanks, Zack
by Zack
Show 4 more comments