Sony Xperia TX LT29i Working Instructions page 45

Replacement: RCV Flex FPC
Place the Ear Speaker in the cavity.
Press to secure its attachment and position.
Be careful! Do not touch the contact pins!
Turn it over.
Press to snap the hook of the RCV Flex FPC Assy.
1266-4901 Rev 1
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Sony Mobile Communications AB – Company Internal
Working Instructions (mech)
45(78)