Checking Bluetooth Block - LG U250 Service Manual

4. TROUBLE SHOOTING

4.8 Checking Bluetooth Block

Test Point of the Bluetooth Block
TP2
TP1
BT_CLK
VREG_MSMP_2.7V
VREG_BT_2.85V
TP3
TP4
Test Point of the Bluetooth Block
BLUETOOTH
TP2
LBRQ-2B43A
C171 1000p
9
CLK_REF
C172 1u 3
VCC_OUT
C173 2.2u
2
VDD_INT
R123
10
VDD_MSM
0
14
VDD_BAT
TP1
Schematic of the Bluetooth Block
TP1. VREG_BT_2.85V
TP2. VREG_MSMP_2.7V
TP3. TCXO_BT
TP4. BT ANT Output
TP4
R118
0
L126
NA
M100
4
SBST
11
SBCK
12
SBDT
5
SYNC_DET_TX_EN
13
RX_BB_TX_BB
7
XTAL_IN
1000p
- 92 -
ACS2450HBAXX
NC1
FEED NC2
ANT103
BT_SBST
BT_SBCK
BT_SBDT
BT_TX_RX_N
BT_DATA
TCXO_BT
C176
TP3