LG HB620 Service Manual

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4. TROUBLE SHOOTING
4.10 Bluetooth trouble
Bluetooth supplied voltages are generated by the PM6650.
Those signal’s path are : PM6650 → VREG_BT_2.85V is asserted → TCXO_BT 19.2MHz is asserted
→ Bluetooth ON → BT_TX_RX_N is High → BT serial interface control is operated
(SBST / SBCK / SBDT)
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
[Fig. 4.8] Schematic of Bluetooth Interface
BLUETOOTH
LG INNOTEK
13
17
PGND1
PGND2
18
PGND3
19
20
PGND4
2
RF_IN_OUT
16
RX_BB_TX_BB
8
SBCK
SBDT
7
SBST
6
12
SYNC_DET_TX_EN
TCXO_IN
14
9
VBB_OUT VCC_OUT
10
4
VDD_A
15
VDD_MSM
M701
LBDA23QJS0
11
CLK_REF
GND1
1
GND2
3 5
GND3 GND4
L701
100nH
2.2u C713
1.5p C903
C717 1u
ANT701
FEED
NC1
NC2
VREG_BT_2.85V
1000p C716
C715 1000p
NA L702
2.2u
C718
C712
1u
C714 0.75p
BT_CLK
BT_SBCK
BT_SBDT
BT_SBST
BT_TX_RX_N
TCXO_BT
BT_DATA
TCXO
VREG_TCXO_2.85V
VREG_BT_2.85V
1000p
C149
100K
R116
TC7SH04FS
U103
1000pC148
X101
2
GNDOUT
3
VCC
4
VCONT
1
19.2MHz
0.01u
C145
100pC153C152 1000p
0.1u
C143
1000p
C144
TRK_LO_ADJ
TCXO_BT
TCXO_PM
TCXO_OUT
PIN #6
PIN #8
PIN #7
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LG HB620 Specifications

General

Brand	LG
Model	HB620
Category	Cell Phone
Language	English