CDMA version of the fourth generation iPhone. Repair is straightforward, but the front glass and LCD must be replaced as a unit. 16 or 32 GB / Model A1349 / CDMA compatibility.

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iPhone 4 CDMA not charging + Resets Periodically

At first the iPhone wouldn't charge. So I replaced the dock connector and it still wouldn't charge. But if I removed the original battery it would power on. However, it would reset every minute or so on it's own. So I thought I should replace the battery. Got a new one. It had a full charge when I got it and it started to charge as indicated in the icon and by the Verizon light turning on the plug indicating it was drawing power. (On a side, I've tried a variety of plugs and adapters) Then the light turned off and it no longer charged after a few seconds. Same issue. And it still resets periodically. I opened it up a few times and everything looks good. Followed the step by steps on iFixit. Other than not charging and reseting periodically everything functions in the time frame it is on. Wifi, bluetooth, cell, speakers and mic. Nothing seems loose and I can't see where there might be a short....

I've also tried reset Network Settings and the holding home and power to reset it a few times.

At this point I don't know what to do. Any suggestions?

Answered! View the answer I have this problem too

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Hi,

The iPhone 4, as well as the 4S, were ripe with power management issues. In this case, your problem is likely a combination of 2 things:

  1. The USB/charging IC (sometimes called Q2 if you're googling for it) is likely bad and needs to be repaired or replaced. This is a BGA (ball gate array) component on the board and requires hot air rework station and some skill to replace. Some people remove it and jumper across pins B1-B3 but that means you no longer have any charging protection and a voltage fluctuation will damage the PMIC. I have reballed some and had it work but generally replacing it is my first option.
  2. The Power Management IC (PMIC) is likely damaged as well. With 4S's I'd say it gets damaged 30% of the time when the USB IC is damaged. I don't have enough experience with 4's to say if it's the same there, but the reboot issue is common and usually caused by the PMIC

It is possible that something else in the power circuit is blown instead/in addition, but that's not as common.

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Thank you so much for your help. I guess in either case, I don't have the tools or skills at the moment to deal with either of those possibilities. Maybe when I have some extra time, I'll open it up and take another look to find the components you mentioned.

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arrmcgarr will be eternally grateful.
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