Reboot loop when plugged in, no response otherwise

Hi

In Apple phones when u disconnect battery and plug charger then phone show boot up to Apple logo and then restart again and again.

So in your case when you dropped your phone it’s look like that battery flex/cable got damaged and it’s same case now as I discussed above( disconnected battery)

And u plug charger it’s goes to boot loop.

Chances that battery is unplugged or loose connections is very low because it is secured by screws until someone opened it before and missing screws for battery.

Best way to diagnose is to check your phone with new battery or test battery with multimeter whatever easily available to you.

There are also chances that something wrong internally other than battery.

In that case check first by disconnecting front camera and booting phone.

If it works then need to replace front camera.

Wrost case is motherboard itself and in this I recommend you to go for professional phone repair centre if u don’t have experience in fixing motherboard.

I hope this will find you helpful.

Regards and happy fixing

Micky