MBP Mid 2007 (A1226) - Won't power/wake unless battery has significant charge

Discussion in 'MacBook Pro' started by mstrswrd06, Jan 23, 2013.

  1. mstrswrd06, Jan 23, 2013
    Last edited: Jan 23, 2013

    mstrswrd06 macrumors newbie

    Joined:
    Oct 30, 2007
    #1
    Odd question but I'm a little stumped as to where to take this one, and was hoping to get some second opinions.

    I've got a mid 2007 Macbook Pro (A1226) that POSTs fine, boots fine, but only when the battery has a decent charge; REGARDLESS if the charger is hooked in or not.

    The battery itself still works, only barely though. I can get about an hour out of a full charge (health is around 40%) but I'm not in a situation where I can purchase a replacement quite yet.

    After I haven't used it for a day or two, the battery will typically be dead. I plug it in with a known good charger, but it won't power on with the power button. I have to wait about 20-30 minutes with the charger in before IT POWERS ON BY ITSELF. Charging/usage is normal after this, and I can even shut it off and power it back on with the power button as usual, as long as it has a charge.

    This also applies to sleep, too. If it's asleep with a weak battery, when I plug it in and try to wake it up it will not wake until it's been plugged in for at least 5-10 minutes. Again, charging/usage is normal afterwards.

    Resetting SMC didn't seem to correct the issue.

    I can charge, power on, remove the battery and turn it on/off with the charger alone no problem. If the charger is removed and replaced without the battery it won't power on again, but if I replace the battery (charged) while plugged in it powers on (with no button press). So maybe it's not the main battery.

    The problem is independent of the OS - this is strictly a hardware issue.

    Was there ever a PRAM/CMOS battery in this model, and could that be causing my trouble? It is a nearly 5 year old laptop at this point. I've opened it up a few times for HDD swaps but never noticed such a battery while working. I don't believe it's the motherboard because after having a charge and powering on, it functions fine but weirder things have happened so I could be wrong.

    I still have some more troubleshooting I can do on it, but does anyone have any insight?
     
  2. Xgm541 macrumors 6502a

    Joined:
    May 3, 2011
    #2
    Other than replacing the battery, I don't know if you have options. My gut feeling tells me, and I am no expert in batteries, that your battery is 60% dead and those "cells" can no longer be recharged. When you start charging it, it tries to charge the 60% of damaged cells first, which it fails to do, so your computer has absolutely no battery power left for the first 20-25 min of charging. Ever notice how your iphone (if you have one) won't turn on if you let it die, it'll stay in a recharging state till it has at least some juice left? Same can probably be applied here. it's just trying to charge a battery that's hard to charge.
     
  3. justperry macrumors 604

    justperry

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    In the core of a black hole.
    #3
    Buy a new battery, I am pretty positive that is the problem, as the above poster says.
     
  4. mstrswrd06, Jan 23, 2013
    Last edited: Jan 23, 2013

    mstrswrd06 thread starter macrumors newbie

    Joined:
    Oct 30, 2007
    #4
    Doesn't explain why it won't power on off the charger alone. At least, without previously having it plugged in while working.
     
  5. justperry macrumors 604

    justperry

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    #5
  6. mstrswrd06 thread starter macrumors newbie

    Joined:
    Oct 30, 2007
    #6
  7. justperry macrumors 604

    justperry

    Joined:
    Aug 10, 2007
    Location:
    In the core of a black hole.
    #7
    No worries, I actually thought MBP's didn't have one, must be the newer ones which don't come with one.

    Yeah, keep us updated.
     
  8. mstrswrd06 thread starter macrumors newbie

    Joined:
    Oct 30, 2007
    #8
    Got the new PRAM battery and installed. No joy.

    Did some more troubleshooting and I'm still at the point where the Macbook won't cold start off AC alone. With a charged battery it's just fine. :confused:
     
  9. mstrswrd06 thread starter macrumors newbie

    Joined:
    Oct 30, 2007
    #9
    Found the potential problem.

    My workplace has a bunch of 60w chargers. It's what I've been using since all I really work with here is mid 2007 Macbooks (non-Pro). Those all use 60w chargers. The Macbook Pro uses 90w chargers.

    This whole time I've been using the 60w charger without even considering that factor.

    I am embarass.

    I'll pick up a 90w charger tonight and that should fix the issue.
     

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