Chosen Solution
Hi, After going to a store to get my iPhone SE screen replaced my iphone does not boot up (stuck in boot loop) and cannot even hold a charge meaning it will not even power on if not connected to with the power cable. I have tried: getting a new screen replacement but the problem persists;disconnecting the battery and with the cable connected (does the same)resetting through itunes, it will reset and update but will still be stuck in the boot loop
Hmmm…erratic battery readings…? Do a thorough visual inspection, preferably with magnification, of the area surrounding the battery connector. There are several tiny SMD components just above the connector. Of particular importance is FL2400, highlighted in red. If it is missing (which can happen when you pry the connector off), then the battery state does not get communicated to the CPU and this can also cause charging issues and fluctuating readings.
This is a common error by DIY fixers and inexperienced techs (or even experienced techs not fully concentrated ;>).
Install a known good battery. The phone is boot looping because it is not getting any data from the battery.
