1.Fuse is on the VCC trace that goes to pins C3,C4,D3 of the MAX8839L power ic.
2.Iphone 4g charging manager is
CSD75202W15 => "75202" near socket connector
3.try this
4.try chagne this ic its CSD75202W15 => "75202"
Its protect usb power -5V
5.or here....
iphone 4 power management ic
iphone4.jpg
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