LG CU920 - Checking Bluetooth Block

LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.9 Checking Bluetooth Block
1. TP1 : VREG_BT_2.85V
2. TP2 : VREG_MSMP_2.7V
3. TP3 : TCXO_BT
4. TP4 : BT ANT Output
5. TP5 : BT_CLK
TP1
TP2
TP3
TP4
TP5
Fig. 4.9.1 Test point of the Bluetooth Block
BLUETOOTH
C103
1.2p
L102
0
NA
C124
100p
C100
C102
1000p
VCC
5
R100
100K
TC7S04FU
U100
GND
3
24
2.2u
C108
100p
100p
C110
C107
0.1uF
C109
1u
C104
1u
C106
GND3
15
2
LDO1
3
LDO2 NC
13 8
RX_BB_TX_BB
10
SBCK
SBDT
11 6
SBST
SYNC_DET_TX_EN
5
14
VDD_A
12
VDD_MSM
4
XTAL_IN
RB04
U101
16
ANT
CLK_REF
9
GND1
1
GND2
7
C105
1000p
1000p
C101
FEED
NC1 NC2
ANT100
BT_SBDT BT_SBST BT_SBCK BT_TX_RX_N BT_DATA
BT_CLK
VREG_MSMP_2.8V
VREG_BT_2.85V
VREG_BT_2.85V
TCXO_BT
Fig. 4.9.2 Schematic of the Bluetooth Block
TP3
TP4
TP5
TP1
TP2