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Macbook USB not out putting enough power

For some reason my macbooks usb ports dont output enough power... its a macbook pro late 2015 16gb machine yet when i plug in my iphone it just flashes on and off charge, occasionally if i close all programs it works..

heres what the system outputs about the phone coonected to the usb.. the phone is an iphone 7

iPhone:

  Product ID: 0x12a8

  Vendor ID: 0x05ac  (Apple Inc.)

  Version: 8.02

  Serial Number: ddda699531d5203e0a1fd580430d0f60df6a3353

  Speed: Up to 480 Mb/sec

  Manufacturer: Apple Inc.

  Location ID: 0x14200000 / 28

  Current Available (mA): 500

  Extra Operating Current (mA): 0

最后更新：2017-09-09 01:19:15

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