Bluetooth and wifi Antenna Replacement

Hi

I was practicing on dummy iphone 5s. And I did the steps in order to reassemble the iphone 5s. When i charge the phone, instantly the flash light comes on very brite and when i unplug the phone then it becomes low light. I don’t know what that means. Does that simply the phone is charging i doubt it. Cause my own personal iphone when i charge it doesn’t do that ever. Just want to know what yall think it means and if it means that i need to go check what i did in the iphone over again. Maybe i messed up on one of the steps.

If you could please let me know that be great