苹果手机电量用到1%后充电只能关机后冲，开机冲不了！用USB数据线连接电脑也没反应！电脑提示无法

别接口！可同学的手机是连接正常的！怎么解决啊？

怀疑充电管理芯片出了问题

pin signal description 1 gnd ground (-), internaly connected with pin 2 on ipod motherboard 2 gnd audio & video ground (-), internaly connected with pin 2 on ipod motherboard 3 right line out - r (+) (audio output, right channel) 4 left line out - l(+) (audio output, left channel) 5 right in line in - r (+) 6 left in line in - l (+) 8 video out composite video output (only when slideshow active on ipod photo) 9 s-video chrominance output for ipod color, photo only 10 s-video luminance output for ipod color, photo only 11 gnd serial gnd 12 tx ipod sending line, serial txd 13 rx ipod receiving line, serial rxd 14 rsvd reserved 15 gnd ground (-), internaly connected with pin 16 on ipod motherboard 16 gnd usb gnd (-), internaly connected with pin 15 on ipod motherboard 17 rsvd reserved 18 3.3v 3.3v power (+) stepped up to provide +5 vdc to usb on ipod camera connector. if ipod is put to sleep while camera connector is present, +5 vdc at this pin slowly drains back to 0 vdc. 19,20 +12v firewire power 12 vdc (+) 21 accessory indicator/serial enable different resistances indicate accessory type: 1kohm - ipod docking station, beeps when connected 10kohm - takes some ipods into photo import mode 500kohm - related to serial communication / used to enable serial communications used in dension ice link plus car interface 1mohm - belkin auto adaptor, ipod shuts down automatically when power disconnected connecting pin 21 to ground with a 1mohm resistor does stop the ipod when power (i.e. firewire-12v) is cut. looks to be that when this pin is grounded it closes a switch so that on loss of power the ipod shuts off. dock has the same resister. 22 tpa (-) firewire data tpa (-) 23 5 vdc (+) usb power 5 vdc (+) 24 tpa (+) firewire data tpa (+) 25 data (-) usb data (-) 26 tpb (-) firewire data tpb (-) 27 data (+) usb data (+) pins 25 and 27 may be used in different manner. to force the ipod 5g to charge in any case, when "usb power 5 vdc" (pin 23) is fed, 25 must be connected to 5v through a 10kohm resistor, and 27 must be connected to the ground (for example: pin 1) with a 10kohm resistor. to charge an iphone 3g / ipod touch 2nd gen, usb data- (25) should be at 2.8v, usb data+(27) should be at 2.0v. this can be done with a few simple resistors: 33k to +5v (23) and 22k to gnd(16) to obtain 2v and 33k to +5v and 47k to gnd to obtain 2.8v. this is a "notification" to the iphone that it is connected to the external charger and may drain amps from the usb. 28 tpb (+) firewire data tpb (+) 29,30 gnd firewire ground (-)