LG KE990 Service Manual - Page 123

Bluetooth trouble

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4. TROUBLE SHOOTING 4.14 Bluetooth trouble Bluetooth supplied voltages are generated by the PM6635. Those signal's path are : PM6635 → VREG_MSMP_2.7V and 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) C800 NA BT_ANT BT_GND R800 0 L800 NA 12MHz BT_CLK C801 1000p C803 C804 1u 1u PGND4 PGND3 PGND2 PGND1 ANT 16 LBRQ-2B43A M800 9 CLK_REF 3 VCC_OUT 2 VDD_INT 10 VDD_MSM 14 VDD_BAT SBST SBCK 4 11 SBDT 12 SYNC_DET_TX_EN 5 13 RX_BB_TX_BB 7 XTAL_IN GND4 GND3 GND2 GND1 BLUETOOTH LG INNOTEK TP800 TP801 TP802 BT_SBST BT_SBCK BT_SBDT R807 0 C802 1000p BT_TX_RX_N BT_DATA TCXO_BT 19.2MHz R808 10K R809 10K 1 6 15 8 17 20 19 18 VREG_MSMP_2.7V VREG_BT_2.85V C811 C812 100p 0.1u C813 C814 100p 2.2u VREG_TCXO_2.85V C139 0.1u C140 1000p TCXO_PM RTR6275_TCXO C144 1000p C147 1000p X100 OUT GND 3 2 4 VCC VCONT 1 19.2MHz R115 100ohm C141 0.01u TRK_LO_ADJ R120 100K C148 8200p U102 TC7SH04FS C145 1000p VREG_BT_2.85V TCXO_BT 19.2MHz Figure. Schematic of Bluetooth Interface LGE Internal Use Only - 124 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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- 124 -
4. TROUBLE SHOOTING
4.14 Bluetooth trouble
Bluetooth supplied voltages are generated by the PM6635.
Those signal’s path are : PM6635
→
VREG_MSMP_2.7V and 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
BLUETOOTH
LG INNOTEK
1u
C804
1000p
C802
10K
R809
BT_ANT
VREG_BT_2.85V
C814
2.2u
100p
C811
TP802
0
R807
1u
C803
NA
C800
TP800
10K
R808
VREG_MSMP_2.7V
0
R800
1000p
C801
TP801
C812
0.1u
PGND2
18
19
PGND3
PGND4
20
RX_BB_TX_BB
13
SBCK
11
12
SBDT
SBST
4
5
SYNC_DET_TX_EN
3
VCC_OUT
14
VDD_BAT
VDD_INT
2
VDD_MSM
10
7
XTAL_IN
M800
LBRQ-2B43A
ANT
16
9
CLK_REF
1
GND1
GND2
6
8
GND3
GND4
15
17
PGND1
BT_GND
C813
100p
NA
L800
BT_CLK
BT_SBCK
BT_SBDT
BT_SBST
BT_TX_RX_N
TCXO_BT
BT_DATA
0.01u
C141
1000p
C145
X100
2
GND
OUT
3
VCC
4
VCONT
1
19.2MHz
U102
TC7SH04FS
C144
1000p
0.1u
C139
1000p
C140
100K
R120
C147
1000p
C148 8200p
100ohm
R115
TRK_LO_ADJ
VREG_TCXO_2.85V
TCXO_BT
VREG_BT_2.85V
TCXO_PM
RTR6275_TCXO
Figure. Schematic of Bluetooth Interface
12MHz
19.2MHz
19.2MHz