Chosen Solution

Very strange after WiFi/Bluetooth replacement. Won’t boot unless plugged in to AC . . . Then after boot home screen works but can’t shut down. Tried Power reboot but Apple logo just comes on/off every 10 seconds. Then will shut down holding both power/home button 10 seconds. Very strange after new WiFi/Bluetooth replacement from I fix it still won’t light up. . . . While other things went crazy and the iPhone SE worked perfectly before replacement. I’m only guessing that the original problem might have been the Logic Board??? Help

@robcart7 There is two possibilities.

  1. The battery is malfunctioning or damaged somehow and will not provide power to the phone. (a working battery is required to power up your phone without a charger, kinda think ya know this)
  2. Damage to the logic board or a malfunctioning WiFi/Bluetooth antenna is causing things to be haywire. Also, do you have a computer running macOS handy? We can rule out the battery by testing the battery via an application on macOS if you have a computer running it.