iPhone 14 Pro overheating after battery replacement

Hi everyone,

I recently replaced the battery in my iPhone 14 Pro. After the replacement, the phone started overheating right after turning it on. To rule out the new battery as the cause, I reinstalled the original battery, but the issue remains the same.

I checked all connectors and flex cables – everything seems properly connected, and there is no visible physical damage inside. However, I noticed that the main processor itself gets extremely hot immediately after powering on.

Has anyone experienced something similar or knows what could cause this? Could it be an issue with the power management IC or a short somewhere around the CPU?