Sony Xperia TX LT29i Working Instructions page 27

Replacement: Loudspeaker & Adhesive Speaker
Press to secure its attachment.
Peel off the protective film.
Place it in the cavity.
Note the orientation of the Loudspeaker to be installed!
Press to secure its attachment and position.
Be careful! Do not touch the contact pins!
1266-4901 Rev 1
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Sony Mobile Communications AB – Company Internal
Working Instructions (mech)
27(78)