iPhone connects and disconnects all the time, it won't sync.

  • Problem
  • Updated 7 days ago
My iPhone sometimes disconnects when I connect it and repeat this action over and over, like you plug in a USB stick and then disconnect it, and connect it again (but then all the time). It drives me crazy. It works when I put the iphone in the normal charger and then I try to connect it again with my mac.
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Justus

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Posted 7 years ago

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Mark Biech

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I had the same problem ... turned on Tethering, after setting up the tethering service with my phone company ... same problem .. but ... I noticed that if I turn blue tooth off and then on again on the iphone, it works when connecting from the Mac
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Meneldur

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I think I found the problem.
It's related to iPhone power requirements and USB port power capacity. It's clear the iPhone needs its good power quota from the USB port for charging. If the USB port it's connected to doesn't meet its power requirements, this disconnection issue could arise. It's quite understandable. If minimum current is not delivered, voltage will drop a bit and that would affect the connection, resulting in the phone getting disconnected.
USB ports should have enough power for the iPhone. Apple would not sell millions of devices that could not charge and connect with the port they say it should. So I think the issue is related mainly to power supply quality. USB ports feed from the 5V rail. If that rail is not powerful enough to satisfy every device sucking power from it, it will drop. Right now, my system shows 4.68V on the 5V rail. Ok, internal mobo voltage meters are not extremely precise, but they do the job showing that real voltage is below the 5V mark. So replacing my power supply unit should do the trick.
Another solution is buying a self-powered USB hub. This hubs offer USB ports fed using it's own power supply, so any demanding device should not affect system power supply, therefore not showing any issue.
A last resource could be a USB Y-cable. I've seen one of these on a website a couple of days ago. They have two male connectors on one end and one female on the other. You then plug both males in two USB ports at your computer, having twice the power of a single USB port, allowing the iPhone to have it's needed drink of power. However, if 5V rail is low, no matter how many ports you join for more juice, the signals will have problem since they are interpreted by voltage rather than current.
My two cents.
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Nooreldeen Shady

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how could i fix my port
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Eduard Sevch

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just need to plug charger on on your macbook 
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Steven Pilcher

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I just got rid of the phone 4 years ago and haven't had a problem since. Lol.
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rsmmartins

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Meneldur is right... His suggestion fixed my problem... good job!
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sppilch21

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having the same problem. i plug in my iphone4 and it disconnects reconnects dozens of times a minute then just doesnt connect at all. i have an 1100 watt PSU so im pretty sure thats not it, i run all kinds of other devices from that port with no hiccup at all. Very annoying cuz i have a $500 phone that i cant update or sync. help anyone????
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whynotemailme

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The easiest work around is actually the best work around. If you've got a jailbroken iPhone (which you should have as the phone is pretty well garbage if it isn't jailbroken) just install WiFi Sync. You don't even have to plug your phone into your computer! It sync's over your WiFi network. :D

You'll never sync with a cable again. It's super.
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Meneldur

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Kudos for whynotemailme. That solution works and I was using it. The only drawback is that long transfers seem to stall the connection and you have to repeat the process.
Anyway, I'm free now. I have an Android phone. :)
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whynotemailme

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Try disabling bluetooth. I know it sounds silly, but apparently bluetooth can interfere with the WiFi connection especially when doing a large transfer.
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da12k.l0rd

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I tried initially connecting my iPhone to my mac .. but iTunes would always give the error to disconnect it and reconnect it again ... Got tired of it ..

Then I tried connecting my iPhone to a USB hub with 5 USB ports connected to my Macbook.. It then worked without a glitch :) Thank you Meneidur for the idea :)
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John Lawver

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I had the same issue, I had my iphone plugged into the usb port on my keyboard, switched it to the front usb port (macpro) and no issues... as of yet...
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Sohail Malik

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Dear all I found its solution, I was too much tired and wasted approx 2 days with installing fresh windows 7 64bits as there was same problem and it was disconnecting and reconnecting within seconds

Actually there was problem with incorrect iPhone data cable, if you are not using original cable which came with iPhone then it will work for you too, because there is available iPhone cables in market those are not compatible with iPhone 4 or 4S, I had data cable and there were 4 pins inside of 30 pins connector and when I connected 5 pins inside of 30 pins connector my iPhone is working perfect

Correct pins configuration is hereunder



Hope it will work for you

Regards,
Sohail Malik
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Sohail Malik

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Dear PtatozGunaPtate, please read carefully my above post which solved my problem that was wrongly fucked with me :-)
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Sohail Malik

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My iPhone is not now connects and disconnects all the time, so I can say my LUCK is with me, what about you dear.. is your iphone still connects and disconnects??? :P
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PtatozGunaPtate

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I meant this post is 5 YEARS OLD. I'm sure the original poster would've fixed it by now.
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Sohail Malik

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You are right but too many peoples are still getting same problem like me, so it is not my fault if I came here after 5 years...
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What

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This is not the problem; I use the same offical cable for 4 and 4s and only have the issue with the 4s