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Discuss [Advice] iPhone 3g, charging but won't turn on? Logic board? Something else wrong? at the Hardware - Hackint0sh.org; Hi, I have an iphone 3g. It won't turn on or make a sound when ...
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    Default [Advice] iPhone 3g, charging but won't turn on? Logic board? Something else wrong?

    Hi,

    I have an iphone 3g. It won't turn on or make a sound when I plug it in. It WILL charge though even if nothing shows on the display.

    Any idea what that might indicate?



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    Super Moderator Array n1ckn4m3's Avatar

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    How do you know it's charging if nothing shows on the screen? Just to help us help you troubleshoot.
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    Quote Originally Posted by n1ckn4m3 View Post
    How do you know it's charging if nothing shows on the screen? Just to help us help you troubleshoot.
    Two reasons:

    I used a voltmeter to check if juice went from the charger to the battery, that's a yes.

    2nd, I used a battery that had a very low charge and now it's charged.

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    Super Moderator Array n1ckn4m3's Avatar

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    Ah, good to hear. I'm not used to asking that and hearing the right answers. Can you trace voltage out of the battery to the logic board or can you simulate load to ensure that the battery is actually holding the charge when loaded? My first iPhone 2G had a battery that would 'charge', show voltage and amperage, but the charge would dissipate immediately upon sustained load of about 5-10 seconds, it took me forever to realize that the battery had just died and needed to be replaced. I troubleshot that thing for way too long.
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    Quote Originally Posted by n1ckn4m3 View Post
    Ah, good to hear. I'm not used to asking that and hearing the right answers. Can you trace voltage out of the battery to the logic board or can you simulate load to ensure that the battery is actually holding the charge when loaded? My first iPhone 2G had a battery that would 'charge', show voltage and amperage, but the charge would dissipate immediately upon sustained load of about 5-10 seconds, it took me forever to realize that the battery had just died and needed to be replaced. I troubleshot that thing for way too long.
    Yes, voltage can be traced to at least connector 1, but since I don't what voltage to expect it simply told me that the logic board can't be completely fried. Nothing whatsoever indicates that visually either. The battery will work under load.


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    Hrm, I hate to say I've never experienced the same -- normally the problems I see when the device won't charge are either a busted dock connector (no voltage to charging circuit) or a battery that doesn't hold a charge. I've never experienced one where I could trace voltage leaving the battery to connection 1 and not had the device turn on. Not sure what to tell you at this point. If it was me, I'd begin to assume it was a problem with the logic board, since you know the charging circuit is working due to the battery charging, and you know the battery is working under load and spitting power to the main logic board. Problem with that assumption is that it's a fairly expensive one to attempt to fix, especially to find out after the fact it doesn't fix the problem...
    The preceding forum post has been brought to you by the letter "N" and the number 42.

    iPhone 4, 32GB (iOS 6.1.2 | evasi0n | SHSH: 4.0 - 6.1.2)
    iPad 2 3G, 64GB (iOS 6.1.2 | evasi0n
    |
    SHSH: 4.3 & 4.3.3 - 6.1)

    Restore problems? Read this: http://www.hackint0sh.org/f137/130802.htm

    Did we solve your problem? Got a dollar or two spare? Please Donate!


 

 

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