This solution below may possibly useful and help fix and repair Nokia X6 Bluetooth, WLAN and GPS problem issues for it shows the Bluetooh, WLAN and GPS component circuit.
1) Check all corresponding supply voltages in the circuit
2) Check the RF buffer clock feeds from the RF circuit
3) Check the Bluetooth and WLAN antenna
4) Rework the Bluetooth IC first, the WLAN will not work if the Bluetooth IC is faulty.