7819 Views 6 Replies Latest reply: Jan 27, 2011 11:14 AM by TennisManu
Unfortunately there's probably no way to know without doing hardware component isolation, such as testing the unit with a known-good left IO board or main logic board. It could also be the power cable that runs between the two though I've only seen that once or twice.
I assume by "I've power drained the unit" you mean you've reset the SMC? It sounds like an SMC issue to me, which points toward logic board. Especially b/c if you remove the battery while AC's plugged in it works.
You're using 85W power adapters, yes?
Isn't resetting the SMC just power draining anyway? It may be different, but I just removed the battery and AC and held down the power button for around 10 seconds
I have around 7 of these at the moment with this issue.
I have installed a new mainboard in one, which didn't fix it, and then tried the I/O board in another, again no change.
I may look into the cable. I sent one of them to the Apple repair guys and they sent it back saying the power adapter and battery were causing it, so i ordered those even though the one I had were perfectly fine, and it didn't change anything.
Extremely frustrating units
I just didn't know what you meant by power draining. Some would mean this as 'I drained the battery down to 0%', which isn't the same from removing the AC adapter and battery and holding the power button down for 5 seconds, which is the actual SMC reset procedure.
This can also be a grounding issue, but a bad battery can also corrupt the SMC and cause this problem. Maybe if the batteries you're testing with are over 300 cycles, Apple determined that they were not known-good batteries. They're not just saying this arbitrarily, they have a battery diagnostic utility that they run.
Any update on this? This is the same thing that's going on with my laptop right now. I was at the Genius Bar and they said they can send it in for repair. Takes 7-9 days and costs a minimum of $310. At the time I was there, my computer wouldn't start up at all, because the battery had drained to less than 20%. It didn't even start with just the power cord (no battery in). The "genius" finally got it to work by doing a PRAM and SMC reset. Got home and was able to recharge my battery to 100%. Used my computer for 2 days before I dared to take it off the power supply. Lo and behold, as soon as I take it off the power cord, then re-connect it, it shows "Not Charging". I tried to do SMC again, but no luck. Keeps saying "not charging". Even tried with a brand new battery. Do I have to get the I/O board thingy replaced?