LG M6100 Service Manual - Page 80

Replace U103, Replace U403, Replace U401, Bluetooth, Power off, Replace Headset, Replace M401,

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Page 80 highlights

4. TROUBLE SHOOTING Checking Flow Is BT_RST signal shape similar to Fig.1 during Powering on Bluetooth Yes 2V8_VBT at C405=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? No Connect BT headset? No Replace U103 No BT_EN at R401=2.8V Yes Replace U401 No Replace U403 No Replace U403 No Replace M401 Is RF Power level at Antenna Feeding about 0dBm? No Is RF Power level at Antenna Feeding about 0dBm? Establish a call Replace Headset Replace M401 Are PCM_SYC8,PCM_TX,USC3 signal similar to Fig.4-10(c) ? No Replace U403 Is DEBUG_RX signal similar to Fig.4-10(b) during Powering on Bluetooth? No Replace M401 Redownlapd SW - 81 -

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4. TROUBLE SHOOTING
- 81 -
No
Is BT_RST signal shape similar
to Fig.1 during Powering
on Bluetooth
Yes
Replace U103
2V8_VBT at C405=2.8V
No
BT_EN at R401=2.8V
No
Replace U403
Yes
Replace U401
Bluetooth
Power off
Is DEBUG_TX signal similar to
Fig.2 during Powering on
Bluetooth?
No
Replace U403
Is DEBUG_RX signal similar to
Fig.2 during Powering on
Bluetooth?
No
Replace Headset
Connect BT headset?
No
Is RF Power level at
Antenna Feeding about
0dBm?
Is RF Power level at
Antenna Feeding about 0dBm?
Replace M401
Replace M401
Establish a call
Is DEBUG_RX signal similar to
Fig.4-10(b) during Powering on
Bluetooth?
No
Replace M401
Are PCM_SYC8,PCM_TX,USC3
signal similar to Fig.4-10(c) ?
No
Replace U403
Redownlapd SW
No
Checking Flow