Sony Xperia TX LT29i Working Instructions page 99

Problem Areas: Speaker
Check:
Inspect the BtB connector of Key Flex FPC to the PBA.
Action:
1. If not properly connected – disconnect and reconnect.
2. If dirty or oxidized – clean the both sides of the BtB
connector.
3. If the two BtB connectors or the FPC of the Key Flex FPC
is damaged – replace the Key Flex FPC.
4. Replace board.
1266-5087 Rev 1

Sony Mobile Communications AB – Company Internal
Troubleshooting Guide (mech)
17(57)