: Verifying SIM locks and checking IMEI numbers to rule out network-level blacklisting. 5. Quality Control & Documentation A professional repair isn't complete without verification:
: Interview the user to understand the circumstances of the failure (e.g., liquid exposure, drops, or recent updates).
: Always power down the device and use anti-static (ESD) tools to prevent further motherboard damage. 2. Common Software Troubleshooting
: Cleaning or replacing USB/Ethernet ports that fail to transfer data or power.
: Replacing degraded lithium-ion batteries that no longer hold a charge or have begun to swell.
