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iPhone connects and disconnects from Mac

Hello,


When I plug in my iPhone to my Macbook pro, it repetitively connects and disconnects. Therefore I cannot charge my phone through my computer anymore.


I own this iPhone since decembre 2018, and this issue only appeared this week. However when I plug in my iPhone to a wall outlet, it charges perfectly. I also noticed that there is a lag time before my phone starts charging when connected to my Macbook (before disconnecting right away, and then reconnecting etc).

I tried to connect my iPhone to both USB ports of my Macbook, with many different Apple lightning cables and also my Anker cable (MFI certified), but the issue substains. I plugged in my mother's iPhone 6 to my Macbook and it charged perfectly. I plugged in my iPhone to my brother's former Macbook pro (15" from 2008) and my iPhone could charge normally.


Here everything I tried to resolve this issue (which failed by the way) :

- I shut down and turned on my computer and my phone.

- I reseted location and privacy of my phone (Devices rapidly disconnect/reconnect - Macbook Air Mid 2013).

- I also restored my phone.


Could anyone tell me a solution?


I specify that I have a 256Go iPhone X under IOS 11.2.5 and a 13" retina Macbook pro (mid 2014) under High Sierra 10.13.3.


[Re-Titled by Moderator]

iPhone X, iOS 11.2.5

Posted on Feb 10, 2018 1:34 PM

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Question marked as Best reply

Posted on Aug 28, 2019 4:20 PM


Sep 11, 2018 8:27 AM in response to MélodyH

Connect your iphone to your Mac.

Go to Activity Monitor --> Search for usbd --> Force quit it.



The above worked for me. To add a bit: You click on the upper right of your screen where there is a magnifying glass and search "activity monitor." Keep "CPU" highlighted. Type "usbd" into the search box. Now plug in your phone. It'll connect, reconnect, connect, reconnect and so you have to be quick and double click on "usbd" even though photos and itunes keeps popping up. then once you've successfully double clicked "usbd," click on "quit" which takes you to a screen that says "force quit" and click "force quit."


I also took the recommendation of going to my iphone and settings-->general-->reset-->click on reset location and privacy.


I did both and it worked.

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276 replies

Jan 3, 2022 9:56 AM in response to MélodyH

I have a friend with a 2013 MBA and this happened some time ago when I was showing her how to back up her phone to the laptop. At that time the solution was to go to Network settings and remove the phone as a network device. Tried to back up her phone again recently, it kept doing the connect/disconnect but it didn’t show as a network device and no other solution worked, including resetting trust on the phone. Her laptop has another account just for backing up her moms phone, and so I had the thought to log into that account. Sure enough the phone asked if I should trust the computer, I said yes, logged back into my friend’s account and the phone then worked fine. So if no other solution has worked, try creating a new account on the machine and see if the device works like that (if not you may have to reset the trust on the phone first). Hope this helps.

Jan 31, 2022 11:44 AM in response to MélodyH

What worked for me; unplugging the cable from the Mac, plugged the cable into the phone first (iPhone 12), then plugged it back into the USB port on the computer, for whatever reason, that corrected it for me. Prior to this quick fix, it did not matter how many times I plugged my phone in, it would just show charging then not charging over and over.

Mar 28, 2022 9:40 PM in response to rpmartins

This terminal command also worked for me! Much thanks! I've struggled with this for a long long time! And currently I have a failed battery on my Mid 2015 MBPro Retina so only running off of the external power supply and I can still charge my phone now! Thanks again (in this case to: rpmartins) for providing answers to keep us all going!

____________________________

Originally posted by rpmartins:

Try terminal :

sudo killall -STOP -c usbd

____________________________

Peace!

slashGW

May 3, 2022 6:28 AM in response to ankit1694

I had my iPhone doing the same thing, connects and disconnects from Mac, I tried all options mentioned in the forum without lack. Recently I have moved my office to another room and had shut down Mac and disconnect all cables from it, left it off overnight without any cables connected to the Mac, even power cable disconnected from the wall outlet. The next day reconnected all cables and now my phone charges with no problems. I had to Trust my device first.



iPhone connects and disconnects from Mac

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