Sony Xperia TX LT29i Working Instructions page 137

Problem Areas: HandsFree by Wire
3. If the pads or the BtB connector of the RCV Flex FPC is
damaged – replace the RCV Flex FPC.
4. Replace board.
1266-5087 Rev 1
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Sony Mobile Communications AB – Company Internal
Troubleshooting Guide (mech)
55(57)