Sony Xperia tipo ST21i Working Instructions page 8

Disassembly
Do the same on the opposite side.
Turn the phone over and gently raise this side of the Front
Assy approximately 45 degree to release the hooks of the
top side and bottom side as shown in picture.
Do not stretch the FPC!
Disconnect the BtB connector.
Do not stretch the FPC!
Remove the Front Assy.
1266-1672 Rev 3
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Sony Mobile Communications AB – Company Internal
Working Instructions (mech)
8(39)