Sony Xperia Z1 Troubleshooting Manual page 23

Problem Areas: Microphone
3. 3. If the BtB connector of FPC Assembly Mic or FPC is
damaged – replace the FPC Assembly Mic.
4. Replace Main PBA.
1277-9814 Rev 2

Sony Ericsson Mobile Communications AB – Company Internal
Troubleshooting Guide (mech)
23(63)