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Discuss [Advice] iPhone without any response : Battery issue ? Comm board dead ? at the Hardware - Hackint0sh.org; Originally Posted by crispain Hey francis, I don't understand this. I received several iphones dead, ...
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    Quote Originally Posted by crispain View Post
    Hey francis,

    I don't understand this. I received several iphones dead, when they're connected to some ipod car charges or sound systems. Replacing just the logic board with a working one, they come back to life. So it seems that the comm boards works fine in all the cases.
    How jumping the red wire terminal with the point you showed in the comm board, make the logic boards work again?
    crispain,

    Can you let me know where you get your logic boards from, I would like to buy one asap

    thanks


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    Mostly from droped out iphones or part lots.
    I guess you may find at ebay.

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    Very interesting topic to talk about. I should receive a non working iphone soon with non-charging problem, so I will try to make the jumper. The question for Francis: how did you figured out that the jumper will help? Very interesting stuff =)

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    Quote Originally Posted by Andy_S View Post
    Very interesting topic to talk about. I should receive a non working iphone soon with non-charging problem, so I will try to make the jumper. The question for Francis: how did you figured out that the jumper will help? Very interesting stuff =)
    Sorry but I am not convinced this is a fix, for the short battery life problem........and certainley not without a little more detail of why it fixes this problem.

    Anyone know exactly what component is damaged by incorrect charging?

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    Yeah.. this is not convincing for me either.
    If the problem is the motherboard, I rather incline to what cRACKn proposes here


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    As far as i know the problem is in Linear Technology LT4066 chip...

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    Quote Originally Posted by Minimarvel View Post
    Sorry but I am not convinced this is a fix, for the short battery life problem........and certainley not without a little more detail of why it fixes this problem.

    Anyone know exactly what component is damaged by incorrect charging?
    Hi mate,

    I have showed the jumper coz the actual track in the comm board is veak & breaks easily...result in open track, Its the VBB for the power ic..

    Regards,

    Francis

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    Some people claim that the lt4066 chip becomes too hot, what is the reason? Is this a weak contact in comm board?

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    Quote Originally Posted by Andy_S View Post
    Some people claim that the lt4066 chip becomes too hot, what is the reason? Is this a weak contact in comm board?
    God I'm confused....and Im an electronic engineer!

    I understand the problem is on the logic board and not the comm board....so why many references to the comm board?????

    People have said changing the Logic board makes the battery life go back to normal, and thanks very much for the LT4006 info (downloaded the datasheet and makes sense why this could be the problem) but why are wqe still talking about links.
    Francis, can you clarify exactly what the 2 links you have described are for. Is there a known weakness on BOTH cards that create 2 Different problems. My phone works fine, just not for very long.....doesn't get hot or anything just 5 hours battery life max.....certainly seems like a battery management issue.

    Andy you speak about the lt4066 chip, in relation to the comm board, but from what i understand this is not where the problem is?????

    Thanks all you guys for taking the time to respond....it is very appreciated even if it is confusing....

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    I've made a mistake, of course lt4066 chip is in logic board. So when you will change the board the problem with battery will be solved, cause you've changed lt4066 chip to another one with logic board. The main question is - can we make a working logic board if we resolder lt4066 chip with another one? I'll try to change lt4066 chip with a new one, when i'll get the phone...


 

 

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