Chosen Solution
So after an issue with the phone not charging, I replaced the charging port (oem apple iPhone 5s from donor phone) , and the battery as the battery had decreased its ability to hold a charge. Rebooted phone and it is working, however after a couple of minutes of use it crashes with a blue screen for a second before restarting. I have researched this and the BSOD appears to be a different fault caused by the overtightening of screws damaging the 7 bus lines on the PCB. I am sure this is not my fault. So I have tried different batteries, checked and double checked the repairs I have done (charging port). I have done the basics of restore and reset with no change in prognosis. I am sure its something simple any ideas? The only thing I haven’t done is changed the screen, there is as always a possibility that a cable has been damaged here during works, but for now its working as normal?? Please Help.
that could be your front cam flex or the usb ic u2 chip going bad. since you already had charging issues that could very well be the issue. when that chip fails you start losing the ability to charge and sync the device. it will also BSOD. if you damaged the traces during the repair it wouldnt even boot to home screen. it would keep boot looping and bsod.
i read about a screw of the emi shield above all fpc connectors. maybe you took the wrong screw(position down right) and damaged some cables on the pcb
