Released on September 19, 2014, this 4.7" screen iPhone is the smaller version of the iPhone 6 Plus.

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phone wont boot up

i phone 6new charge port..new screen, new battery..turns on to apple logo for about 5 seconds then back off. does not show battery charging icon. at battery have roughly 4vt. not sure it has a sim card, sons old phone.

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Just to help troubleshoot, why did you change the charge port, battery and screen?

Can you plug it into a USB ammeter to see if there is any current flow?

Replacement charge ports and batteries are notorious for low quality. You may have a defective replacement part.

Otherwise, a bootlooping device can be caused by many things. Give us more history by commenting on this answer.

A few things to consider:

  • Try a hard reset (Home & Power button for 10 secs)
  • Use a genuine Apple Lightning connector
  • Use a genuine Apple charging brick and let it charge overnight
  • Try to connect it to different computers with iTunes if possible
  • Put the phone in recovery mode (search DFU Mode). Careful, this can reset your data so only do it if you have a backup.
  • If you want to get deeper, disconnect the screen assembly and see if iTunes will recognize the phone.

Otherwise, you may have a logic board issue. If you are uncomfortable doing these steps, consider finding a repair shop to do the troubleshooting. A shop that also does micro-soldering can go deeper if the problem is not modular in nature.

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