5s Blue Screen of Death Bootloop

Problem description:

The phone is stuck in an apple logo boot loop with Blue screen of death cutting it off.

I can break the boot loop if I leave the battery disconnected for some time, once I plug the battery back in and let it boot up it boots up fine.

Then if I switch off the phone and try to turn it on again it's stuck in the BSOD boot loop.

Then again to get it working I have to disconnect the battery again and do the above.

What I've checked:

- Checked screw holes for long screw damage, no damage visible there

- Tried booting with front camera, rear camera, charging port, antennas unplugged

- Tried booting via DC Bench power supply adapter

What I am going to do:

- Replace tristar charging chip (U2)

Should I try anything else first before doing so?