Sony Ericsson K750 Troubleshooting Manual, Mechanical page 31

Will not connect Visually inspect the Bluetooth antenna
with a functional contact pads on the PCB
Bluetooth device
Visually inspect the Bluetooth antenna
If the issue has not been resolved !
4/000 21-1/FEA 209 544/94 C
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Sony Ericsson Mobile Communications AB
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If dirty or oxidized – Clean it.
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If dirty or oxidized – Replace it.
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If damaged – Replace it.
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Handle the unit according to local directives.
Trouble Shooting Guide, Mechanical
31(33)