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
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?
check the fuses near where the battery contacts are, also check connector 4 on your motherboard. then it's power ic
sorry pollytintop could you explain a little more detailed?
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
not recognised in itunes? not charging? no display?
all of the above
