iPhone 7 will only charge when off any solutions?

Hello,

That's not normal. I would still recommend these steps:

If your device won’t charge or charges slowly

If you have very low battery and plug into power, a black screen or a black screen with a red battery might appear for a few minutes. Follow these steps and try again after each:

1. Check your charging cable and USB adapter for signs of damage,* like breakage or bent prongs. Don't use damaged accessories.
   
2. Use a wall power outlet and check for firm connections between your charging cable, USB wall adapter, and wall outlet, or try a different outlet.
3. Remove any debris from the charging port on the bottom of your device, then firmly plug your charging cable into your device. If the charging port is damaged, your device probably needs service.
   
4. Let your device charge for a half hour (If your device is unresponsive afterward, learn what to do).
5. Force restart your device:
   • On an iPhone 7 or iPhone 7 Plus: Press and hold both the Sleep/Wake and Volume Down buttons for at least ten seconds, until you see the Apple logo.
   • On an iPhone 6s and earlier, iPad, or iPod touch: Press and hold both the Sleep/Wake and Home buttons for at least ten seconds, until you see the Apple logo.
6. Let your device charge for another half hour.
7. If your device still won’t power on or charge, take your device, charging cable, and charging adapter to an Apple Retail Store or Apple Authorized Service Provider for evaluation. You can also contact Apple Support.

*If you aren't sure that an accessory is damaged, take it to an Apple Retail Store or Apple Authorized Service Provider for evaluation, or contact Apple Support.

What ever happened with your phone? Did you have to have it replaced? I have had 3 phones in the last 7 months and now the 3rd phone, after having it only a week, is now doing the same thing. It will not charge unless completely powered off. I only use the charger that came with the phone. I made an appointment to, I guess, get a 4th phone! This is all really frustrating considering how much we pay for these phones! Please let me know if you found out any info that can be useful.

Take care.