Revamped version of the iPhone 3G with faster processing speeds. Repair of this device is similar to the 3G, and requires simple screwdrivers and prying tools. Model A1303 / 16 or 32 GB capacity / black or white plastic back.

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Logic board not working

what can cause the logic board to just stop working?

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First off you need to check that its the logic board and not any of the components like dock or battery. Try your board in a friends case or Take the board out, check your connections and while you're there check the output on the battery. Use a multimeter on pins 1+4 should be 3.7mAh for a fully charged battery, but not working at about 2.2? If it's dead then replace it. Usually a battery will give warnings like freezing up, crashing, not holding charge for long.

If your battery is good then you need to check the dock connector for dirt/damaged pins etc that are stopping it from charging or being recognised. replace it or just that flex.

After that it gets a whole lot more tricky..

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i have another working 3gs that needs a backlight coil i tryed the battery from that in it and it still didnt turn on and i also swapped docks and still nothing

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Ok I've confirmed it's not that battery or the dock so it has to be the logic board how do I fix it? is there something on the board I need to replace?

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check the fuses near where the battery contacts are, also check connector 4 on your motherboard. then it's power ic

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sorry pollytintop could you explain a little more detailed?

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Jared, I think that pollytintop may refer to the fuses as shown on the pictures at this question Won't turn on after attaching to car charger

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Water damage, drop damage, electricity damage (getting shorted out), old age, and many more reasons.

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ok my 3gs just stopped working out of the blue no drop water damage nothing what could be wrong i replaced the battery and still nothing

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not recognised in itunes? not charging? no display?

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all of the above

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I have the same problem with on my 3GS as jared does. I replaced the battery with a new one and still not turning on. my phone just died out one day. So im thinking my logic board is bad? any thoughts?

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Check oldturkeys link

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Jared will be eternally grateful.
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