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RM-356
BB Troubleshooting and Manual Tuning Guide
Bluetooth and FM radio
Bluetooth and FM radio introduction
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 turn 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 FM
headset inserted.
Able to perform scans
to detect local FM radio
stations with
functional FM headset
inserted, but unable to
hear FM audio through
headset.
Bluetooth and FM radio component placement
The figure below shows the key component placement for BTHFMRDS2.1M in RM-356.
Issue 1
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
(PCM interface).
Open circuit solder joints or
detacted component in
Bluetooth antenna circuit.
Open circuit solder joints or
detached component in FM
antenna circuit.
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 of Bluetooth antenna circuit.
Repair of FM antenna circuit.
Repair of FM audio circuit.
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