LG KG800 Service Manual page 78

Checking Flow
Is BT_RST signal shape similar
to Fig.1 during Powering on Bluetooth
Yes
2V8_VBT at C314=2.8V
Bluetooth
Power off
Is DEBUG_TX signal similar to
Fig.2 during Powering on Bluetooth?
Is DEBUG_RX signal similar to
Fig.2 during Powering on Bluetooth?
Connect BT headset?
Establish a call
Are PCM_SYC8,PCM_TX,USC3
signal similar toFig.3?
Is DEBUG_RX signal similar to
Fig.2 during Powering on Bluetooth?
Redownlapd SW
No
Replace U103
No
BT_EN at R344=2.8V
Replace U102
No
Replace U103
No
Replace M101
No
Is RF Power level at
Antenna Feeding about 0dBm?
Replace Headset
No
Replace U103
No
Replace M101
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4. TROUBLESHOOTING
No
Yes
No
Is RF Power level at
Antenna Feeding about 0dBm?
Replace M101
Replace U103