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    Default macbook battery pinout/how can a macbook be powered from the battery pins

    Hi everyone,

    I've accidentally spilled water on my macbook and damaged it's power supply section. Apple says the logic board has to be replaced costing more than a new computer. The computer however works perfectly fine using a battery, although it can't charge one. Neither can it be powered from it's DC-IN port. So' I've been trying to power it from the battery connector pins , measuring the actual voltage a fully charged battery provides and applying it to the corresponding pins on the connector itself.
    Unfortunately nothing happens. I know the battery has an internal micro-controller which communicates with the computer exchanging information about battery status/temp, etc. but I never thought that this communication is essential to power the computer from the battery.
    So, the next step I tried was dismantling a battery pack, disconnecting the battery cells from the tiny circuit board inside the pack and connecting a power supply of 12 volts instead (that's about the voltage the six LiPo Cells supply), hoping that the laptop will power up (having recognized the board. Still nothing. I then noticed that the little board has a direct connection to ONE of the Li-Po Cells (probably for voltage monitoring). I never tried simulating this, i.e. connecting a voltage source identical to a Li-Po cell there though.

    I' m a bit frustrated here. I really believed this last option would work. Has anybody tried to do something similar with a macbook or even perhaps knows the battery pinout on the connector? ( I have searched the entire net for this with no result).

    What i need to know specifically is wether the computer actually has to "talk" to the battery (i.e. exchange info over the serial bus) or if it simply measures resistance or a control voltage perhaps at some of the battery pins before it can powerup.

    I would really like to use the computer in this way, as I feel it would be wasted if i threw it away alltogether. I'm not interested in a replacement logic board as i've already bought a Feb'08 macbook pro as a replacement.

    Any help would be much appreciated
    Thank you in advance.
    GrSpider
    Last edited by grspider; 03-28-2008 at 10:30 AM.



 

 

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