LG KU250 Service Manual - Page 91
Checking Bluetooth Block
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4. TROUBLE SHOOTING 4.8 Checking Bluetooth Block Test Point of the Bluetooth Block TP2 TP1 TP3 TP4 TP1. VREG_BT_2.85V TP2. VREG_MSMP_2.7V TP3. TCXO_BT TP4. BT ANT Output Test Point of the Bluetooth Block BT_CLK VREG_MSMP_2.7V VREG_BT_2.85V TP4 BLUETOOTH TP2 C171 1000p R123 0 C172 1u C173 2.2u L126 NA M100 LBRQ-2B43A ANT 16 9 CLK_REF 3 VCC_OUT 2 VDD_INT 10 VDD_MSM 14 VDD_BAT SBST 4 SBCK 11 SBDT 12 SYNC_DET_TX_EN 5 13 RX_BB_TX_BB 7 XTAL_IN R118 0 ACS2450HBAXX FEED NC1 NC2 ANT103 NA C169 1000p C176 BT_SBST BT_SBCK BT_SBDT BT_TX_RX_N BT_DATA TCXO_BT C179 100p C177 0.1uF C180 2.2u C178 100p 20 PGND4 19 PGND3 18 PGND2 17 PGND1 GND4 15 GND3 8 GND2 6 GND1 1 TP1 TP3 Schematic of the Bluetooth Block - 92 -
4.8 Checking Bluetooth Block
Test Point of the Bluetooth Block
Test Point of the Bluetooth Block
Schematic of the Bluetooth Block
4. TROUBLE SHOOTING
- 92 -
TP1. VREG_BT_2.85V
TP2. VREG_MSMP_2.7V
TP3. TCXO_BT
TP4. BT ANT Output
TP1
TP2
TP3
TP4
BLUETOOTH
NA
L126
1000p
C171
R118
0
C169
NA
100p
C178
1u
C172
C179
100p
ANT103
FEED
NC1
NC2
ACS2450HBAXX
C177
0.1uF
SYNC_DET_TX_EN
5
VCC_OUT
3
14
VDD_BAT
2
VDD_INT
10
VDD_MSM
7
XTAL_IN
16
ANT
CLK_REF
9
GND1
1
GND2
6
GND3
8
GND4
15
PGND1
17
PGND2
18
19
PGND3
PGND4
20
13
RX_BB_TX_BB
11
SBCK
SBDT
12
4
SBST
LBRQ-2B43A
M100
1000p
C176
C173
2.2u
C180
2.2u
0
R123
BT_DATA
TCXO_BT
VREG_MSMP_2.7V
BT_CLK
BT_SBCK
BT_SBDT
BT_SBST
VREG_BT_2.85V
BT_TX_RX_N
TP4
TP1
TP3
TP2