Chosen Solution
I recently fixed the power button on my iPhone because it broke. But when I called after turning on the power, it became a forced boot. While looking for a problem, a fever broke out on the main board on the FPC camera side. The phone also worked when the front camera cable was removed and powered on. After repeated this process several times, it is now impossible to boot when the front camera cable is connected. Is this a problem with the front camera flex? Is it a problem with the FPC camera?
Do you see physical damage on the front camera connector on the logic board? If not then try getting the front camera assembly replaced because if the connection to the proximity sensor which is on the front camera is damaged it will cause the phone to reboot when a call is started.
