Nokia N900 Service Manual page 93

RX-51
BB Troubleshooting
Introduction to Bluetooth/FM radio troubleshooting
The Bluetooth and FM radio are combined in the same ASIC, so both features are checked when
troubleshooting.
The following problems can occur with the Bluetooth and FM radio hardware:
Symptom
Unable to switch on Bluetooth on
phone user interface
Able to send data file to another
Bluetooth device, but unable to
hear audio through functional
Bluetooth headset
Able to switch on Bluetooth on
phone user interface, but unable
to detect other Bluetooth devices
Able to turn on FM radio and
Bluetooth on phone user
interface, but unable to detect
local FM radio stations with Nokia
headset inserted
Able to perform scans to detect
local FM radio stations with
functional Nokia headset
inserted, but unable to hear FM
audio through headset
Users may experience the following problems resulting in functional phones being returned to the repair
centre:
Issue 1
Figure 12 Bluetooth/WLAN antenna
Problem
Open circuit solder joints or
component failure of BTH/FM
ASIC/module BB ASICs or SMD
components
Open circuit solder joints or
component failure of BTH/FM
ASIC/module BB ASICs
Open circuit solder joints or
antenna pins not making
contact with Bluetooth/WLAN
antenna
Open circuit solder joints or
detached component in FM
antenna circuit
Check antenna pin contacts with
Bluetooth/WLAN antenna
Open circuit solder joints or
detached component in FM
audio path between Bluetooth/
FM ASIC and headset
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Repair solution
Replacement of Bluetooth/
FM ASIC/module
Replacement of Bluetooth/
FM ASIC/module
Repair or replace Bluetooth/
WLAN antenna
Repair components or
replace Bluetooth/WLAN
antenna module
Repair of FM audio circuit
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