Logic board not working
what can cause the logic board to just stop working?
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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.
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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